{"id":45579,"date":"2025-07-30T00:36:02","date_gmt":"2025-07-29T16:36:02","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/45579.html"},"modified":"2025-07-30T00:36:02","modified_gmt":"2025-07-29T16:36:02","slug":"html5-%e8%af%a6%e8%a7%a3%e9%80%9f%e8%a7%88","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/45579.html","title":{"rendered":"HTML5 \u8be6\u89e3\u901f\u89c8"},"content":{"rendered":"<h2>HTML5 \u8be6\u89e3\u901f\u89c8<\/h2>\n<h3>1. 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class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#about<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5173\u4e8e<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token 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class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>header<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>main<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>article<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>header<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h2<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6587\u7ae0\u6807\u9898<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h2<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>time<\/span> <span class=\"token attr-name\">datetime<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>2023-01-01<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>2023\u5e741\u67081\u65e5<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>time<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>header<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n          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tag\"><span class=\"token punctuation\">&lt;\/<\/span>section<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>section<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h3<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u7b2c\u4e8c\u90e8\u5206<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h3<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u66f4\u591a\u5185\u5bb9&#8230;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>section<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>footer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u4f5c\u8005&#xff1a;\u5f20\u4e09<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>footer<\/span><span 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<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u76f8\u5173\u6587\u7ae01<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u76f8\u5173\u6587\u7ae02<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>ul<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>aside<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>main<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>footer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token entity named-entity\" title=\"\u00a9\">&amp;copy;<\/span> 2023 \u7248\u6743\u6240\u6709<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>footer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h4>2.2 \u8be6\u7ec6\u8bed\u4e49\u6807\u7b7e\u8bf4\u660e<\/h4>\n<h5>&lt;header&gt; &#8211; \u9875\u7709<\/h5>\n<p><span class=\"token comment\">&lt;!&#8211; \u9875\u9762\u5934\u90e8 &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>header<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token 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class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>article<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>header<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h2<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6587\u7ae0\u6807\u9898<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h2<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u53d1\u5e03\u65f6\u95f4&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>time<\/span> <span class=\"token attr-name\">datetime<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>2023-01-01<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>2023-01-01<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>time<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>header<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6587\u7ae0\u5185\u5bb9&#8230;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>article<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h5>&lt;nav&gt; &#8211; \u5bfc\u822a<\/h5>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>nav<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>ul<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#home<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u9996\u9875<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#products<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u4ea7\u54c1<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#services<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u670d\u52a1<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#contact<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u8054\u7cfb<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>ul<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>nav<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h5>&lt;main&gt; &#8211; \u4e3b\u8981\u5185\u5bb9<\/h5>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>main<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>article<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h1<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u4e3b\u8981\u5185\u5bb9<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h1<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u8fd9\u91cc\u662f\u9875\u9762\u7684\u4e3b\u8981\u5185\u5bb9&#8230;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>article<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>main<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h5>&lt;article&gt; &#8211; \u72ec\u7acb\u6587\u7ae0<\/h5>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>article<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>header<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h2<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u535a\u5ba2\u6587\u7ae0\u6807\u9898<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h2<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u4f5c\u8005&#xff1a;\u674e\u56db | \u53d1\u5e03\u65f6\u95f4&#xff1a;2023-01-01<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>header<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6587\u7ae0\u6b63\u6587&#8230;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>footer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6807\u7b7e&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>span<\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>tag<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6280\u672f<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>span<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>span<\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>tag<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u524d\u7aef<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>span<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>footer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>article<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h5>&lt;section&gt; &#8211; \u7ae0\u8282<\/h5>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>section<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h2<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u4ea7\u54c1\u4ecb\u7ecd<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h2<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u4ea7\u54c1\u8be6\u7ec6\u4fe1\u606f&#8230;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>section<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>section<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h2<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u7528\u6237\u8bc4\u4ef7<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h2<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u7528\u6237\u53cd\u9988\u5185\u5bb9&#8230;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>section<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h5>&lt;aside&gt; &#8211; \u4fa7\u8fb9\u680f<\/h5>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>aside<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h3<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6700\u65b0\u6587\u7ae0<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h3<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>ul<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6587\u7ae0\u6807\u98981<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6587\u7ae0\u6807\u98982<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>ul<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>aside<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>aside<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h3<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5e7f\u544a\u4f4d<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h3<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5e7f\u544a\u5185\u5bb9&#8230;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>aside<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h5>&lt;footer&gt; &#8211; \u9875\u811a<\/h5>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>footer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token entity named-entity\" title=\"\u00a9\">&amp;copy;<\/span> 2023 \u516c\u53f8\u540d\u79f0. \u4fdd\u7559\u6240\u6709\u6743\u5229.<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>nav<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#privacy<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u9690\u79c1\u653f\u7b56<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#terms<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u670d\u52a1\u6761\u6b3e<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>nav<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>footer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h5>&lt;figure&gt; \u548c &lt;figcaption&gt; &#8211; \u56fe\u6587\u7ec4\u5408<\/h5>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>figure<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>img<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>chart.png<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">alt<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>\u9500\u552e\u6570\u636e\u56fe\u8868<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>figcaption<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u56fe1&#xff1a;2023\u5e74\u9500\u552e\u6570\u636e\u8d8b\u52bf<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>figcaption<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>figure<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>figure<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>video<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>demo.mp4<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">controls<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>video<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>figcaption<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u4ea7\u54c1\u6f14\u793a\u89c6\u9891<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>figcaption<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>figure<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h5>&lt;time&gt; &#8211; \u65f6\u95f4\u6807\u8bb0<\/h5>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>time<\/span> <span class=\"token attr-name\">datetime<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>2023-01-01<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>2023\u5e741\u67081\u65e5<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>time<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>time<\/span> <span class=\"token attr-name\">datetime<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>2023-01-01T14:30<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>2023\u5e741\u67081\u65e5\u4e0b\u53482:30<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>time<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>time<\/span> <span class=\"token attr-name\">datetime<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>PT2H30M<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>2\u5c0f\u65f630\u5206\u949f<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>time<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h3>3. \u591a\u5a92\u4f53\u5143\u7d20<\/h3>\n<h4>3.1 \u97f3\u9891 &lt;audio&gt;<\/h4>\n<p><span class=\"token comment\">&lt;!&#8211; \u57fa\u672c\u97f3\u9891\u64ad\u653e &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>audio<\/span> <span class=\"token attr-name\">controls<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>audio.mp3<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>audio\/mpeg<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>audio.ogg<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>audio\/ogg<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    \u60a8\u7684\u6d4f\u89c8\u5668\u4e0d\u652f\u6301\u97f3\u9891\u64ad\u653e\u3002<br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>audio<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">&lt;!&#8211; \u81ea\u52a8\u64ad\u653e&#xff08;\u9700\u7528\u6237\u4ea4\u4e92&#xff09; &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>audio<\/span> <span class=\"token attr-name\">controls<\/span> <span class=\"token attr-name\">autoplay<\/span> <span class=\"token attr-name\">muted<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>background.mp3<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>audio\/mpeg<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>audio<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">&lt;!&#8211; \u5faa\u73af\u64ad\u653e &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>audio<\/span> <span class=\"token attr-name\">controls<\/span> <span class=\"token attr-name\">loop<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>loop.mp3<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>audio\/mpeg<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>audio<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">&lt;!&#8211; \u9884\u52a0\u8f7d &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>audio<\/span> <span class=\"token attr-name\">controls<\/span> <span class=\"token attr-name\">preload<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>metadata<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>song.mp3<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>audio\/mpeg<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>audio<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h4>3.2 \u89c6\u9891 &lt;video&gt;<\/h4>\n<p><span class=\"token comment\">&lt;!&#8211; \u57fa\u672c\u89c6\u9891\u64ad\u653e &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>video<\/span> <span class=\"token attr-name\">width<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>640<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">height<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>480<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">controls<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>movie.mp4<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>video\/mp4<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>movie.webm<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>video\/webm<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    \u60a8\u7684\u6d4f\u89c8\u5668\u4e0d\u652f\u6301\u89c6\u9891\u64ad\u653e\u3002<br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>video<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">&lt;!&#8211; \u5e26\u6d77\u62a5\u548c\u5b57\u5e55 &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>video<\/span> <span class=\"token attr-name\">width<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>800<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">height<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>600<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">controls<\/span> <span class=\"token attr-name\">poster<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>poster.jpg<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>movie.mp4<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>video\/mp4<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>track<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>subtitles_en.vtt<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">kind<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>subtitles<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">srclang<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>en<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">label<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>English<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>track<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>subtitles_zh.vtt<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">kind<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>subtitles<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">srclang<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>zh<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">label<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>\u4e2d\u6587<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>video<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">&lt;!&#8211; \u81ea\u52a8\u64ad\u653e\u548c\u9759\u97f3 &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>video<\/span> <span class=\"token attr-name\">autoplay<\/span> <span class=\"token attr-name\">muted<\/span> <span class=\"token attr-name\">loop<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>background.mp4<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>video\/mp4<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>video<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">&lt;!&#8211; \u5185\u8054\u64ad\u653e&#xff08;\u79fb\u52a8\u7aef&#xff09; &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>video<\/span> <span class=\"token attr-name\">playsinline<\/span> <span class=\"token attr-name\">controls<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>mobile.mp4<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>video\/mp4<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>video<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h4>3.3 \u5a92\u4f53\u5c5e\u6027\u8be6\u89e3<\/h4>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>video<\/span><br \/>\n    <span class=\"token attr-name\">width<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>800<span class=\"token punctuation\">&#034;<\/span><\/span><br \/>\n    <span class=\"token attr-name\">height<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>600<span class=\"token punctuation\">&#034;<\/span><\/span><br \/>\n    <span class=\"token attr-name\">controls<\/span><br \/>\n    <span class=\"token attr-name\">autoplay<\/span><br \/>\n    <span class=\"token attr-name\">muted<\/span><br \/>\n    <span class=\"token attr-name\">loop<\/span><br \/>\n    <span class=\"token attr-name\">preload<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>auto<span class=\"token punctuation\">&#034;<\/span><\/span><br \/>\n    <span class=\"token attr-name\">poster<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>thumbnail.jpg<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>video.mp4<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>video\/mp4<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>source<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>video.webm<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>video\/webm<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>video<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>\u5c5e\u6027\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>controls&#xff1a;\u663e\u793a\u64ad\u653e\u63a7\u4ef6<\/li>\n<li>autoplay&#xff1a;\u81ea\u52a8\u64ad\u653e&#xff08;\u9700\u9759\u97f3\u6216\u7528\u6237\u4ea4\u4e92&#xff09;<\/li>\n<li>muted&#xff1a;\u9759\u97f3\u64ad\u653e<\/li>\n<li>loop&#xff1a;\u5faa\u73af\u64ad\u653e<\/li>\n<li>preload&#xff1a;\u9884\u52a0\u8f7d\u7b56\u7565&#xff08;none\/auto\/metadata&#xff09;<\/li>\n<li>poster&#xff1a;\u5c01\u9762\u56fe\u7247<\/li>\n<li>playsinline&#xff1a;\u5185\u8054\u64ad\u653e&#xff08;\u79fb\u52a8\u7aef&#xff09;<\/li>\n<\/ul>\n<h3>4. Canvas \u7ed8\u56fe<\/h3>\n<h4>4.1 \u57fa\u672c Canvas \u4f7f\u7528<\/h4>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>canvas<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>myCanvas<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">width<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>400<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">height<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>300<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>canvas<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n<span class=\"token keyword\">const<\/span> canvas <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;myCanvas&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> ctx <span class=\"token operator\">&#061;<\/span> canvas<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;2d&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ed8\u5236\u77e9\u5f62<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>fillStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;#FF0000&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">fillRect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ed8\u5236\u8fb9\u6846\u77e9\u5f62<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>strokeStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;#0000FF&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">strokeRect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">120<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ed8\u5236\u5706\u5f62<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">beginPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">arc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>fillStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;#00FF00&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">fill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">stroke<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ed8\u5236\u7ebf\u6761<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">beginPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">moveTo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">50<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">150<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">lineTo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">350<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">150<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>strokeStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;#FF00FF&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>lineWidth <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">stroke<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h4>4.2 Canvas \u9ad8\u7ea7\u7ed8\u56fe<\/h4>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>canvas<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>advancedCanvas<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">width<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>500<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">height<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>400<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>canvas<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n<span class=\"token keyword\">const<\/span> canvas <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;advancedCanvas&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> ctx <span class=\"token operator\">&#061;<\/span> canvas<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;2d&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6e10\u53d8\u586b\u5145<\/span><br \/>\n<span class=\"token keyword\">const<\/span> gradient <span class=\"token operator\">&#061;<\/span> ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">createLinearGradient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ngradient<span class=\"token punctuation\">.<\/span><span class=\"token function\">addColorStop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;red&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ngradient<span class=\"token punctuation\">.<\/span><span class=\"token function\">addColorStop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;blue&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>fillStyle <span class=\"token operator\">&#061;<\/span> gradient<span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">fillRect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ed8\u5236\u6587\u672c<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>font <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;30px Arial&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>fillStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;black&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">fillText<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Hello Canvas!&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">150<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ed8\u5236\u63cf\u8fb9\u6587\u672c<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>strokeStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;red&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>lineWidth <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">strokeText<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Stroke Text&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ed8\u5236\u590d\u6742\u8def\u5f84<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">beginPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">moveTo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">250<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">lineTo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">300<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">150<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">lineTo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">150<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">closePath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>fillStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;yellow&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">fill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>strokeStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;black&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">stroke<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ed8\u5236\u8d1d\u585e\u5c14\u66f2\u7ebf<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">beginPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">moveTo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">350<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">bezierCurveTo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">400<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">25<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">450<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">75<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">400<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>strokeStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;green&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">stroke<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h4>4.3 Canvas \u52a8\u753b\u793a\u4f8b<\/h4>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>canvas<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>animationCanvas<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">width<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>400<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">height<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>300<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>canvas<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n<span class=\"token keyword\">const<\/span> canvas <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;animationCanvas&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> ctx <span class=\"token operator\">&#061;<\/span> canvas<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;2d&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">let<\/span> x <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> dx <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">animate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6e05\u9664\u753b\u5e03<\/span><br \/>\n    ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">clearRect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>width<span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed8\u5236\u79fb\u52a8\u7684\u77e9\u5f62<\/span><br \/>\n    ctx<span class=\"token punctuation\">.<\/span>fillStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;blue&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">fillRect<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u66f4\u65b0\u4f4d\u7f6e<\/span><br \/>\n    x <span class=\"token operator\">&#043;&#061;<\/span> dx<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8fb9\u754c\u68c0\u6d4b<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>x <span class=\"token operator\">&gt;<\/span> canvas<span class=\"token punctuation\">.<\/span>width <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">50<\/span> <span class=\"token operator\">||<\/span> x <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        dx <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span>dx<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ee7\u7eed\u52a8\u753b<\/span><br \/>\n    <span class=\"token function\">requestAnimationFrame<\/span><span class=\"token punctuation\">(<\/span>animate<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5f00\u59cb\u52a8\u753b<\/span><br \/>\n<span class=\"token function\">animate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h3>5. \u8868\u5355\u589e\u5f3a<\/h3>\n<h4>5.1 \u65b0\u7684\u8f93\u5165\u7c7b\u578b<\/h4>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>form<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token comment\">&lt;!&#8211; \u90ae\u7bb1 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>email<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u90ae\u7bb1&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>email<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>email<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>email<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">required<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u7f51\u5740 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>website<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u7f51\u7ad9&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>url<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>website<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>website<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u6570\u5b57 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>quantity<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6570\u91cf&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>number<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>quantity<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>quantity<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">min<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>1<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">max<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>100<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">step<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>1<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u8303\u56f4\u6ed1\u5757 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>range<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u8bc4\u5206&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>range<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>range<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>range<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">min<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>0<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">max<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>10<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">value<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>5<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u989c\u8272\u9009\u62e9\u5668 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>color<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u989c\u8272&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>color<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>color<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>color<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">value<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#ff0000<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u65e5\u671f &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>date<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u65e5\u671f&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>date<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>date<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>date<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u65f6\u95f4 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>time<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u65f6\u95f4&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>time<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>time<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>time<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u65e5\u671f\u65f6\u95f4 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>datetime<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u65e5\u671f\u65f6\u95f4&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>datetime-local<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>datetime<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>datetime<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u6708\u4efd &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>month<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6708\u4efd&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>month<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>month<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>month<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u5468 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>week<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5468&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>week<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>week<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>week<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u641c\u7d22 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>search<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u641c\u7d22&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>search<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>search<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>search<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u7535\u8bdd &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>tel<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u7535\u8bdd&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>tel<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>tel<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>tel<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u63d0\u4ea4 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>submit<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">value<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>\u63d0\u4ea4<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>form<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h4>5.2 \u8868\u5355\u5c5e\u6027\u589e\u5f3a<\/h4>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>form<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token comment\">&lt;!&#8211; \u81ea\u52a8\u805a\u7126 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>text<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>username<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">autofocus<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u5360\u4f4d\u7b26 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>text<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>search<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">placeholder<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>\u8bf7\u8f93\u5165\u641c\u7d22\u5173\u952e\u8bcd<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u5fc5\u586b &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>text<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>required<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">required<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u7981\u7528\u81ea\u52a8\u5b8c\u6210 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>text<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>credit-card<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">autocomplete<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>off<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u81ea\u52a8\u7ea0\u6b63 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>text<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>message<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">autocorrect<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>on<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u62fc\u5199\u68c0\u67e5 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>text<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>comment<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">spellcheck<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>true<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u6700\u5c0f\u6700\u5927\u957f\u5ea6 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>text<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>username<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">minlength<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>3<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">maxlength<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>20<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u6a21\u5f0f\u5339\u914d &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>text<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>phone<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">pattern<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>[0-9]{3}-[0-9]{3}-[0-9]{4}<span class=\"token punctuation\">&#034;<\/span><\/span><br \/>\n           <span class=\"token attr-name\">placeholder<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>123-456-7890<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u591a\u884c\u6587\u672c\u57df\u589e\u5f3a &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>textarea<\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>message<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">rows<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>5<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">cols<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>50<span class=\"token punctuation\">&#034;<\/span><\/span><br \/>\n              <span class=\"token attr-name\">placeholder<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>\u8bf7\u8f93\u5165\u60a8\u7684\u7559\u8a00&#8230;<span class=\"token punctuation\">&#034;<\/span><\/span><br \/>\n              <span class=\"token attr-name\">maxlength<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>500<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>textarea<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>form<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h4>5.3 \u8868\u5355\u9a8c\u8bc1<\/h4>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>form<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>validationForm<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token comment\">&lt;!&#8211; \u5fc5\u586b\u9a8c\u8bc1 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>name<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u59d3\u540d&#xff08;\u5fc5\u586b&#xff09;&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>text<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>name<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>name<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">required<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u90ae\u7bb1\u9a8c\u8bc1 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>email<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u90ae\u7bb1&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>email<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>email<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>email<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">required<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u6570\u5b57\u8303\u56f4\u9a8c\u8bc1 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>age<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5e74\u9f84&#xff08;18-100&#xff09;&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>number<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>age<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>age<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">min<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>18<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">max<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>100<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">required<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u81ea\u5b9a\u4e49\u9a8c\u8bc1 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>password<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5bc6\u7801&#xff08;\u81f3\u5c118\u4f4d&#xff09;&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>password<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>password<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>password<span class=\"token punctuation\">&#034;<\/span><\/span><br \/>\n           <span class=\"token attr-name\">minlength<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>8<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">required<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u786e\u8ba4\u5bc6\u7801 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>label<\/span> <span class=\"token attr-name\">for<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>confirmPassword<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u786e\u8ba4\u5bc6\u7801&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>label<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>password<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>confirmPassword<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>confirmPassword<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">required<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">&lt;!&#8211; \u81ea\u5b9a\u4e49\u9a8c\u8bc1\u811a\u672c &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n    document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;validationForm&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;submit&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> password <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;password&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> confirmPassword <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;confirmPassword&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>password <span class=\"token operator\">!&#061;&#061;<\/span> confirmPassword<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">preventDefault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">alert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5bc6\u7801\u4e0d\u5339\u914d&#xff01;&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u81ea\u5b9a\u4e49\u9a8c\u8bc1<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>password<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">preventDefault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">alert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5bc6\u7801\u81f3\u5c11\u9700\u89818\u4f4d&#xff01;&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>submit<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">value<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>\u6ce8\u518c<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>form<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h3>6. \u672c\u5730\u5b58\u50a8<\/h3>\n<h4>6.1 localStorage<\/h4>\n<p><span class=\"token comment\">\/\/ \u5b58\u50a8\u6570\u636e<\/span><br \/>\nlocalStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">setItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;username&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;John Doe&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nlocalStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">setItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;theme&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;dark&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nlocalStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">setItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;preferences&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">JSON<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">stringify<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    language<span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;zh-CN&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    notifications<span class=\"token operator\">:<\/span> <span class=\"token boolean\">true<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8bfb\u53d6\u6570\u636e<\/span><br \/>\n<span class=\"token keyword\">const<\/span> username <span class=\"token operator\">&#061;<\/span> localStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">getItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;username&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> theme <span class=\"token operator\">&#061;<\/span> localStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">getItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;theme&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> preferences <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">JSON<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">parse<\/span><span class=\"token punctuation\">(<\/span>localStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">getItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;preferences&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token string\">&#039;{}&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5220\u9664\u6570\u636e<\/span><br \/>\nlocalStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">removeItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;username&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6e05\u7a7a\u6240\u6709\u6570\u636e<\/span><br \/>\nlocalStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">clear<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u76d1\u542c\u5b58\u50a8\u53d8\u5316<\/span><br \/>\nwindow<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;storage&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5b58\u50a8\u53d8\u5316:&#039;<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">.<\/span>key<span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">.<\/span>newValue<span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">.<\/span>oldValue<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>6.2 sessionStorage<\/h4>\n<p><span class=\"token comment\">\/\/ sessionStorage \u53ea\u5728\u5f53\u524d\u4f1a\u8bdd\u671f\u95f4\u6709\u6548<\/span><br \/>\nsessionStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">setItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;sessionId&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;abc123&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nsessionStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">setItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;currentPage&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;dashboard&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> sessionId <span class=\"token operator\">&#061;<\/span> sessionStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">getItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;sessionId&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> currentPage <span class=\"token operator\">&#061;<\/span> sessionStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">getItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;currentPage&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9875\u9762\u5173\u95ed\u65f6\u81ea\u52a8\u6e05\u9664<\/span><\/p>\n<h4>6.3 \u5b58\u50a8\u5de5\u5177\u7c7b<\/h4>\n<p><span class=\"token comment\">\/\/ \u672c\u5730\u5b58\u50a8\u5de5\u5177\u7c7b<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">StorageManager<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">const<\/span> serializedValue <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">typeof<\/span> value <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token string\">&#039;object&#039;<\/span><br \/>\n                <span class=\"token operator\">?<\/span> <span class=\"token constant\">JSON<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">stringify<\/span><span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token operator\">:<\/span> value<span class=\"token punctuation\">;<\/span><br \/>\n            localStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">setItem<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> serializedValue<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5b58\u50a8\u5931\u8d25:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">const<\/span> value <span class=\"token operator\">&#061;<\/span> localStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">getItem<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>value <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token constant\">JSON<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">parse<\/span><span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> value<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u8bfb\u53d6\u5931\u8d25:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">key<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            localStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">removeItem<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5220\u9664\u5931\u8d25:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token function\">clear<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            localStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">clear<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u6e05\u7a7a\u5931\u8d25:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">key<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> localStorage<span class=\"token punctuation\">.<\/span><span class=\"token function\">getItem<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528\u793a\u4f8b<\/span><br \/>\nStorageManager<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;user&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;John&#039;<\/span><span class=\"token punctuation\">,<\/span> age<span class=\"token operator\">:<\/span> <span class=\"token number\">30<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> user <span class=\"token operator\">&#061;<\/span> StorageManager<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;user&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>user<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ { name: &#039;John&#039;, age: 30 }<\/span><\/p>\n<h3>7. \u5730\u7406\u5b9a\u4f4d<\/h3>\n<h4>7.1 \u57fa\u672c\u5730\u7406\u5b9a\u4f4d<\/h4>\n<p><span class=\"token comment\">\/\/ \u68c0\u67e5\u5730\u7406\u5b9a\u4f4d\u652f\u6301<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>navigator<span class=\"token punctuation\">.<\/span>geolocation<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u83b7\u53d6\u5f53\u524d\u4f4d\u7f6e<\/span><br \/>\n    navigator<span class=\"token punctuation\">.<\/span>geolocation<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCurrentPosition<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">position<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">const<\/span> latitude <span class=\"token operator\">&#061;<\/span> position<span class=\"token punctuation\">.<\/span>coords<span class=\"token punctuation\">.<\/span>latitude<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">const<\/span> longitude <span class=\"token operator\">&#061;<\/span> position<span class=\"token punctuation\">.<\/span>coords<span class=\"token punctuation\">.<\/span>longitude<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">const<\/span> accuracy <span class=\"token operator\">&#061;<\/span> position<span class=\"token punctuation\">.<\/span>coords<span class=\"token punctuation\">.<\/span>accuracy<span class=\"token punctuation\">;<\/span><\/p>\n<p>            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u7eac\u5ea6:&#039;<\/span><span class=\"token punctuation\">,<\/span> latitude<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u7ecf\u5ea6:&#039;<\/span><span class=\"token punctuation\">,<\/span> longitude<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u7cbe\u5ea6:&#039;<\/span><span class=\"token punctuation\">,<\/span> accuracy<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u7c73&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u663e\u793a\u4f4d\u7f6e\u4fe1\u606f<\/span><br \/>\n            <span class=\"token function\">displayLocation<\/span><span class=\"token punctuation\">(<\/span>latitude<span class=\"token punctuation\">,<\/span> longitude<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">error<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">switch<\/span><span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">.<\/span>code<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> error<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PERMISSION_DENIED<\/span><span class=\"token operator\">:<\/span><br \/>\n                    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7528\u6237\u62d2\u7edd\u4e86\u5730\u7406\u5b9a\u4f4d\u8bf7\u6c42&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> error<span class=\"token punctuation\">.<\/span><span class=\"token constant\">POSITION_UNAVAILABLE<\/span><span class=\"token operator\">:<\/span><br \/>\n                    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f4d\u7f6e\u4fe1\u606f\u4e0d\u53ef\u7528&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> error<span class=\"token punctuation\">.<\/span><span class=\"token constant\">TIMEOUT<\/span><span class=\"token operator\">:<\/span><br \/>\n                    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u6c42\u8d85\u65f6&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> error<span class=\"token punctuation\">.<\/span><span class=\"token constant\">UNKNOWN_ERROR<\/span><span class=\"token operator\">:<\/span><br \/>\n                    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u672a\u77e5\u9519\u8bef&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            enableHighAccuracy<span class=\"token operator\">:<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ \u9ad8\u7cbe\u5ea6<\/span><br \/>\n            timeout<span class=\"token operator\">:<\/span> <span class=\"token number\">10000<\/span><span class=\"token punctuation\">,<\/span>           <span class=\"token comment\">\/\/ \u8d85\u65f6\u65f6\u95f4<\/span><br \/>\n            maximumAge<span class=\"token operator\">:<\/span> <span class=\"token number\">60000<\/span>         <span class=\"token comment\">\/\/ \u7f13\u5b58\u65f6\u95f4<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6d4f\u89c8\u5668\u4e0d\u652f\u6301\u5730\u7406\u5b9a\u4f4d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">displayLocation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">lat<span class=\"token punctuation\">,<\/span> lng<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5728\u5730\u56fe\u4e0a\u663e\u793a\u4f4d\u7f6e<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> mapUrl <span class=\"token operator\">&#061;<\/span> <span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">https:\/\/maps.google.com\/maps?q&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>lat<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">,<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>lng<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">&amp;output&#061;embed<\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n    document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;map&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>innerHTML <span class=\"token operator\">&#061;<\/span><br \/>\n        <span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">&lt;iframe src&#061;&#034;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>mapUrl<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">&#034; width&#061;&#034;100%&#034; height&#061;&#034;400&#034;&gt;&lt;\/iframe&gt;<\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>7.2 \u6301\u7eed\u4f4d\u7f6e\u76d1\u63a7<\/h4>\n<p><span class=\"token comment\">\/\/ \u6301\u7eed\u76d1\u63a7\u4f4d\u7f6e\u53d8\u5316<\/span><br \/>\n<span class=\"token keyword\">let<\/span> watchId<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">startWatching<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>navigator<span class=\"token punctuation\">.<\/span>geolocation<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        watchId <span class=\"token operator\">&#061;<\/span> navigator<span class=\"token punctuation\">.<\/span>geolocation<span class=\"token punctuation\">.<\/span><span class=\"token function\">watchPosition<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">position<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> lat <span class=\"token operator\">&#061;<\/span> position<span class=\"token punctuation\">.<\/span>coords<span class=\"token punctuation\">.<\/span>latitude<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> lng <span class=\"token operator\">&#061;<\/span> position<span class=\"token punctuation\">.<\/span>coords<span class=\"token punctuation\">.<\/span>longitude<span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ \u66f4\u65b0\u4f4d\u7f6e\u663e\u793a<\/span><br \/>\n                <span class=\"token function\">updateLocationDisplay<\/span><span class=\"token punctuation\">(<\/span>lat<span class=\"token punctuation\">,<\/span> lng<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u5230\u8fbe\u76ee\u7684\u5730<\/span><br \/>\n                <span class=\"token function\">checkDestination<\/span><span class=\"token punctuation\">(<\/span>lat<span class=\"token punctuation\">,<\/span> lng<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">error<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u4f4d\u7f6e\u76d1\u63a7\u9519\u8bef:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                enableHighAccuracy<span class=\"token operator\">:<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                timeout<span class=\"token operator\">:<\/span> <span class=\"token number\">5000<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                maximumAge<span class=\"token operator\">:<\/span> <span class=\"token number\">1000<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">stopWatching<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>watchId<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        navigator<span class=\"token punctuation\">.<\/span>geolocation<span class=\"token punctuation\">.<\/span><span class=\"token function\">clearWatch<\/span><span class=\"token punctuation\">(<\/span>watchId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        watchId <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">updateLocationDisplay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">lat<span class=\"token punctuation\">,<\/span> lng<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;latitude&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>textContent <span class=\"token operator\">&#061;<\/span> lat<span class=\"token punctuation\">.<\/span><span class=\"token function\">toFixed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;longitude&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>textContent <span class=\"token operator\">&#061;<\/span> lng<span class=\"token punctuation\">.<\/span><span class=\"token function\">toFixed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">checkDestination<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">currentLat<span class=\"token punctuation\">,<\/span> currentLng<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> destinationLat <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">39.9042<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> destinationLng <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">116.4074<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">const<\/span> distance <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">calculateDistance<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        currentLat<span class=\"token punctuation\">,<\/span> currentLng<span class=\"token punctuation\">,<\/span><br \/>\n        destinationLat<span class=\"token punctuation\">,<\/span> destinationLng<br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>distance <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ 100\u7c73\u5185<\/span><br \/>\n        <span class=\"token function\">alert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u60a8\u5df2\u5230\u8fbe\u76ee\u7684\u5730&#xff01;&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">stopWatching<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8ba1\u7b97\u4e24\u70b9\u95f4\u8ddd\u79bb&#xff08;\u7c73&#xff09;<\/span><br \/>\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">calculateDistance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">lat1<span class=\"token punctuation\">,<\/span> lng1<span class=\"token punctuation\">,<\/span> lat2<span class=\"token punctuation\">,<\/span> lng2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token constant\">R<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">6371e3<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5730\u7403\u534a\u5f84&#xff08;\u7c73&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> \u03c6<span class=\"token number\">1<\/span> <span class=\"token operator\">&#061;<\/span> lat1 <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span><span class=\"token operator\">\/<\/span><span class=\"token number\">180<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> \u03c6<span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;<\/span> lat2 <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span><span class=\"token operator\">\/<\/span><span class=\"token number\">180<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> \u0394\u03c6 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>lat2<span class=\"token operator\">&#8211;<\/span>lat1<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span><span class=\"token operator\">\/<\/span><span class=\"token number\">180<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> \u0394\u03bb <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>lng2<span class=\"token operator\">&#8211;<\/span>lng1<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span><span class=\"token operator\">\/<\/span><span class=\"token number\">180<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">const<\/span> a <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sin<\/span><span class=\"token punctuation\">(<\/span>\u0394\u03c6<span class=\"token operator\">\/<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sin<\/span><span class=\"token punctuation\">(<\/span>\u0394\u03c6<span class=\"token operator\">\/<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n              Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">cos<\/span><span class=\"token punctuation\">(<\/span>\u03c6<span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">cos<\/span><span class=\"token punctuation\">(<\/span>\u03c6<span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span><br \/>\n              Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sin<\/span><span class=\"token punctuation\">(<\/span>\u0394\u03bb<span class=\"token operator\">\/<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sin<\/span><span class=\"token punctuation\">(<\/span>\u0394\u03bb<span class=\"token operator\">\/<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">atan2<\/span><span class=\"token punctuation\">(<\/span>Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sqrt<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sqrt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&#8211;<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token constant\">R<\/span> <span class=\"token operator\">*<\/span> c<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>8. Web Workers<\/h3>\n<h4>8.1 \u57fa\u672c Web Worker<\/h4>\n<p><span class=\"token comment\">\/\/ main.js &#8211; \u4e3b\u7ebf\u7a0b<\/span><br \/>\n<span class=\"token keyword\">const<\/span> worker <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Worker<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;worker.js&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5411 Worker \u53d1\u9001\u6d88\u606f<\/span><br \/>\nworker<span class=\"token punctuation\">.<\/span><span class=\"token function\">postMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span> command<span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;calculate&#039;<\/span><span class=\"token punctuation\">,<\/span> number<span class=\"token operator\">:<\/span> <span class=\"token number\">1000000<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u63a5\u6536 Worker \u6d88\u606f<\/span><br \/>\nworker<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onmessage<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u8ba1\u7b97\u7ed3\u679c:&#039;<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u8017\u65f6:&#039;<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>time<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;ms&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5904\u7406 Worker \u9519\u8bef<\/span><br \/>\nworker<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onerror<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">error<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Worker \u9519\u8bef:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ec8\u6b62 Worker<\/span><br \/>\n<span class=\"token comment\">\/\/ worker.terminate();<\/span><\/p>\n<p><span class=\"token comment\">\/\/ worker.js &#8211; Worker \u7ebf\u7a0b<\/span><br \/>\nself<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onmessage<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">{<\/span> command<span class=\"token punctuation\">,<\/span> number <span class=\"token punctuation\">}<\/span> <span class=\"token operator\">&#061;<\/span> e<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>command <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token string\">&#039;calculate&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> startTime <span class=\"token operator\">&#061;<\/span> Date<span class=\"token punctuation\">.<\/span><span class=\"token function\">now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6267\u884c\u8017\u65f6\u8ba1\u7b97<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">let<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> number<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            result <span class=\"token operator\">&#043;&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sqrt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">const<\/span> endTime <span class=\"token operator\">&#061;<\/span> Date<span class=\"token punctuation\">.<\/span><span class=\"token function\">now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u53d1\u9001\u7ed3\u679c\u56de\u4e3b\u7ebf\u7a0b<\/span><br \/>\n        self<span class=\"token punctuation\">.<\/span><span class=\"token function\">postMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            result<span class=\"token operator\">:<\/span> result<span class=\"token punctuation\">,<\/span><br \/>\n            time<span class=\"token operator\">:<\/span> endTime <span class=\"token operator\">&#8211;<\/span> startTime<br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ Worker \u4e5f\u53ef\u4ee5\u76d1\u542c\u9519\u8bef<\/span><br \/>\nself<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onerror<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">error<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Worker \u5185\u90e8\u9519\u8bef:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>8.2 \u590d\u6742 Worker \u793a\u4f8b<\/h4>\n<p><span class=\"token comment\">\/\/ imageProcessor.js &#8211; \u56fe\u50cf\u5904\u7406 Worker<\/span><br \/>\nself<span class=\"token punctuation\">.<\/span><span class=\"token function\">importScripts<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;utils.js&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>self<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onmessage<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">{<\/span> imageData<span class=\"token punctuation\">,<\/span> operation <span class=\"token punctuation\">}<\/span> <span class=\"token operator\">&#061;<\/span> e<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">switch<\/span><span class=\"token punctuation\">(<\/span>operation<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> <span class=\"token string\">&#039;grayscale&#039;<\/span><span class=\"token operator\">:<\/span><br \/>\n            <span class=\"token function\">processGrayscale<\/span><span class=\"token punctuation\">(<\/span>imageData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> <span class=\"token string\">&#039;blur&#039;<\/span><span class=\"token operator\">:<\/span><br \/>\n            <span class=\"token function\">processBlur<\/span><span class=\"token punctuation\">(<\/span>imageData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> <span class=\"token string\">&#039;brightness&#039;<\/span><span class=\"token operator\">:<\/span><br \/>\n            <span class=\"token function\">processBrightness<\/span><span class=\"token punctuation\">(<\/span>imageData<span class=\"token punctuation\">,<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    self<span class=\"token punctuation\">.<\/span><span class=\"token function\">postMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span> imageData<span class=\"token operator\">:<\/span> imageData <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">processGrayscale<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">imageData<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> data <span class=\"token operator\">&#061;<\/span> imageData<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">let<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> data<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> avg <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;<\/span> data<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;<\/span> data<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        data<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> avg<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ red<\/span><br \/>\n        data<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> avg<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ green<\/span><br \/>\n        data<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> avg<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ blue<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">processBlur<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">imageData<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5b9e\u73b0\u6a21\u7cca\u7b97\u6cd5<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4e3b\u7ebf\u7a0b\u4e2d\u4f7f\u7528\u56fe\u50cf\u5904\u7406 Worker<\/span><br \/>\n<span class=\"token keyword\">const<\/span> imageWorker <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Worker<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;imageProcessor.js&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">processImage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">canvas<span class=\"token punctuation\">,<\/span> operation<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> ctx <span class=\"token operator\">&#061;<\/span> canvas<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;2d&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> imageData <span class=\"token operator\">&#061;<\/span> ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">getImageData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>width<span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u53d1\u9001\u56fe\u50cf\u6570\u636e\u5230 Worker<\/span><br \/>\n    imageWorker<span class=\"token punctuation\">.<\/span><span class=\"token function\">postMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        imageData<span class=\"token operator\">:<\/span> imageData<span class=\"token punctuation\">,<\/span><br \/>\n        operation<span class=\"token operator\">:<\/span> operation<br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63a5\u6536\u5904\u7406\u540e\u7684\u56fe\u50cf\u6570\u636e<\/span><br \/>\n    imageWorker<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onmessage<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">putImageData<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>imageData<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>9. WebSocket \u5b9e\u65f6\u901a\u4fe1<\/h3>\n<h4>9.1 WebSocket \u57fa\u672c\u4f7f\u7528<\/h4>\n<p><span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef WebSocket<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ChatClient<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">constructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">url<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>url <span class=\"token operator\">&#061;<\/span> url<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">WebSocket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>url<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onopen<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">event<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;WebSocket \u8fde\u63a5\u5df2\u5efa\u7acb&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">onConnected<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onmessage<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">event<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> data <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">JSON<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">parse<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">onMessage<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onclose<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">event<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;WebSocket \u8fde\u63a5\u5df2\u5173\u95ed&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">onDisconnected<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onerror<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">error<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;WebSocket \u9519\u8bef:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">onError<\/span><span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;WebSocket \u8fde\u63a5\u5931\u8d25:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">message<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span>readyState <span class=\"token operator\">&#061;&#061;&#061;<\/span> WebSocket<span class=\"token punctuation\">.<\/span><span class=\"token constant\">OPEN<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">JSON<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">stringify<\/span><span class=\"token punctuation\">(<\/span>message<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">disconnect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">onConnected<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8fde\u63a5\u6210\u529f\u56de\u8c03<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">onMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">data<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u63a5\u6536\u6d88\u606f\u56de\u8c03<\/span><br \/>\n        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u6536\u5230\u6d88\u606f:&#039;<\/span><span class=\"token punctuation\">,<\/span> data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">onDisconnected<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8fde\u63a5\u65ad\u5f00\u56de\u8c03<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">onError<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">error<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u9519\u8bef\u56de\u8c03<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528\u793a\u4f8b<\/span><br \/>\n<span class=\"token keyword\">const<\/span> chat <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ChatClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;ws:\/\/localhost:8080&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u53d1\u9001\u6d88\u606f<\/span><br \/>\nchat<span class=\"token punctuation\">.<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    type<span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;message&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    content<span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;Hello World!&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    timestamp<span class=\"token operator\">:<\/span> Date<span class=\"token punctuation\">.<\/span><span class=\"token function\">now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>9.2 WebSocket \u804a\u5929\u5ba4\u793a\u4f8b<\/h4>\n<p><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>WebSocket \u804a\u5929\u5ba4<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token style\"><span class=\"token language-css\"><br \/>\n        <span class=\"token selector\">#chatContainer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">width<\/span><span class=\"token punctuation\">:<\/span> 500px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">margin<\/span><span class=\"token punctuation\">:<\/span> 20px auto<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token selector\">#messages<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">height<\/span><span class=\"token punctuation\">:<\/span> 300px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border<\/span><span class=\"token punctuation\">:<\/span> 1px solid #ccc<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">overflow-y<\/span><span class=\"token punctuation\">:<\/span> scroll<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">padding<\/span><span class=\"token punctuation\">:<\/span> 10px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">margin-bottom<\/span><span class=\"token punctuation\">:<\/span> 10px<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token selector\">.message<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">margin<\/span><span class=\"token punctuation\">:<\/span> 5px 0<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">padding<\/span><span class=\"token punctuation\">:<\/span> 5px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border-radius<\/span><span class=\"token punctuation\">:<\/span> 3px<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token selector\">.own-message<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">background<\/span><span class=\"token punctuation\">:<\/span> #e3f2fd<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">text-align<\/span><span class=\"token punctuation\">:<\/span> right<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token selector\">.other-message<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">background<\/span><span class=\"token punctuation\">:<\/span> #f5f5f5<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token selector\">#messageForm<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">display<\/span><span class=\"token punctuation\">:<\/span> flex<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token selector\">#messageInput<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">flex<\/span><span class=\"token punctuation\">:<\/span> 1<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">padding<\/span><span class=\"token punctuation\">:<\/span> 10px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border<\/span><span class=\"token punctuation\">:<\/span> 1px solid #ccc<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token selector\">#sendButton<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">padding<\/span><span class=\"token punctuation\">:<\/span> 10px 20px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">background<\/span><span class=\"token punctuation\">:<\/span> #2196f3<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">color<\/span><span class=\"token punctuation\">:<\/span> white<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border<\/span><span class=\"token punctuation\">:<\/span> none<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">cursor<\/span><span class=\"token punctuation\">:<\/span> pointer<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>chatContainer<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>messages<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>form<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>messageForm<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>text<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>messageInput<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">placeholder<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>\u8f93\u5165\u6d88\u606f&#8230;<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">required<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>button<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>submit<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>sendButton<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u53d1\u9001<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>button<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>form<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n        <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ChatRoom<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">constructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>username <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;User&#039;<\/span> <span class=\"token operator\">&#043;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">floor<\/span><span class=\"token punctuation\">(<\/span>Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">random<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setupEventListeners<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">WebSocket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;ws:\/\/localhost:8080&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onopen<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u8fde\u63a5\u6210\u529f&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addSystemMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5df2\u8fde\u63a5\u5230\u804a\u5929\u5ba4&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onmessage<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">event<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">const<\/span> data <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">JSON<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">parse<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">displayMessage<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onclose<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addSystemMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u8fde\u63a5\u5df2\u65ad\u5f00&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onerror<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">error<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u8fde\u63a5\u9519\u8bef:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addSystemMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u8fde\u63a5\u9519\u8bef&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u8fde\u63a5\u5931\u8d25:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">setupEventListeners<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> form <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;messageForm&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> input <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;messageInput&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                form<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;submit&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    e<span class=\"token punctuation\">.<\/span><span class=\"token function\">preventDefault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">const<\/span> message <span class=\"token operator\">&#061;<\/span> input<span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">.<\/span><span class=\"token function\">trim<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>message<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sendMessage<\/span><span class=\"token punctuation\">(<\/span>message<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        input<span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">sendMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">content<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span>readyState <span class=\"token operator\">&#061;&#061;&#061;<\/span> WebSocket<span class=\"token punctuation\">.<\/span><span class=\"token constant\">OPEN<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">const<\/span> message <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        type<span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;chat&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                        username<span class=\"token operator\">:<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>username<span class=\"token punctuation\">,<\/span><br \/>\n                        content<span class=\"token operator\">:<\/span> content<span class=\"token punctuation\">,<\/span><br \/>\n                        timestamp<span class=\"token operator\">:<\/span> Date<span class=\"token punctuation\">.<\/span><span class=\"token function\">now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">JSON<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">stringify<\/span><span class=\"token punctuation\">(<\/span>message<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">displayMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">data<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> messagesDiv <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;messages&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> messageDiv <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;div&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">.<\/span>type <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token string\">&#039;system&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    messageDiv<span class=\"token punctuation\">.<\/span>className <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;message system-message&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    messageDiv<span class=\"token punctuation\">.<\/span>innerHTML <span class=\"token operator\">&#061;<\/span> <span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">&lt;em&gt;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>data<span class=\"token punctuation\">.<\/span>content<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">&lt;\/em&gt;<\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">const<\/span> isOwn <span class=\"token operator\">&#061;<\/span> data<span class=\"token punctuation\">.<\/span>username <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>username<span class=\"token punctuation\">;<\/span><br \/>\n                    messageDiv<span class=\"token punctuation\">.<\/span>className <span class=\"token operator\">&#061;<\/span> <span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">message <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>isOwn <span class=\"token operator\">?<\/span> <span class=\"token string\">&#039;own-message&#039;<\/span> <span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;other-message&#039;<\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    messageDiv<span class=\"token punctuation\">.<\/span>innerHTML <span class=\"token operator\">&#061;<\/span> <span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\"><br \/>\n                        &lt;strong&gt;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>data<span class=\"token punctuation\">.<\/span>username<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">:&lt;\/strong&gt; <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>data<span class=\"token punctuation\">.<\/span>content<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\"><br \/>\n                        &lt;small style&#061;&#034;display: block; font-size: 0.8em; color: #666;&#034;&gt;<br \/>\n                            <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Date<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">.<\/span>timestamp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toLocaleTimeString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\"><br \/>\n                        &lt;\/small&gt;<br \/>\n                    <\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><\/p>\n<p>                messagesDiv<span class=\"token punctuation\">.<\/span><span class=\"token function\">appendChild<\/span><span class=\"token punctuation\">(<\/span>messageDiv<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                messagesDiv<span class=\"token punctuation\">.<\/span>scrollTop <span class=\"token operator\">&#061;<\/span> messagesDiv<span class=\"token punctuation\">.<\/span>scrollHeight<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">addSystemMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">content<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">displayMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                    type<span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;system&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                    content<span class=\"token operator\">:<\/span> content<span class=\"token punctuation\">,<\/span><br \/>\n                    timestamp<span class=\"token operator\">:<\/span> Date<span class=\"token punctuation\">.<\/span><span class=\"token function\">now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u804a\u5929\u5ba4<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> chatRoom <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ChatRoom<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h3>10. \u62d6\u653e API<\/h3>\n<h4>10.1 \u57fa\u672c\u62d6\u653e\u529f\u80fd<\/h4>\n<p><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token style\"><span class=\"token language-css\"><br \/>\n        <span class=\"token selector\">.draggable<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">width<\/span><span class=\"token punctuation\">:<\/span> 100px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">height<\/span><span class=\"token punctuation\">:<\/span> 100px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">background<\/span><span class=\"token punctuation\">:<\/span> #4CAF50<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">margin<\/span><span class=\"token punctuation\">:<\/span> 10px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">cursor<\/span><span class=\"token punctuation\">:<\/span> move<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">display<\/span><span class=\"token punctuation\">:<\/span> flex<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">align-items<\/span><span class=\"token punctuation\">:<\/span> center<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">justify-content<\/span><span class=\"token punctuation\">:<\/span> center<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">color<\/span><span class=\"token punctuation\">:<\/span> white<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">font-weight<\/span><span class=\"token punctuation\">:<\/span> bold<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token selector\">.drop-zone<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">width<\/span><span class=\"token punctuation\">:<\/span> 300px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">height<\/span><span class=\"token punctuation\">:<\/span> 200px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border<\/span><span class=\"token punctuation\">:<\/span> 2px dashed #ccc<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">margin<\/span><span class=\"token punctuation\">:<\/span> 20px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">display<\/span><span class=\"token punctuation\">:<\/span> flex<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">align-items<\/span><span class=\"token punctuation\">:<\/span> center<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">justify-content<\/span><span class=\"token punctuation\">:<\/span> center<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">transition<\/span><span class=\"token punctuation\">:<\/span> all 0.3s<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token selector\">.drop-zone.drag-over<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">border-color<\/span><span class=\"token punctuation\">:<\/span> #4CAF50<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">background<\/span><span class=\"token punctuation\">:<\/span> #e8f5e8<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token selector\">.drop-zone.dropped<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">border-color<\/span><span class=\"token punctuation\">:<\/span> #2196F3<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">background<\/span><span class=\"token punctuation\">:<\/span> #e3f2fd<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>draggable<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">draggable<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>true<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">data-type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>square<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6b63\u65b9\u5f62<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>draggable<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">draggable<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>true<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">data-type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>circle<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5706\u5f62<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>draggable<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">draggable<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>true<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">data-type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>triangle<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u4e09\u89d2\u5f62<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>drop-zone<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>dropZone1<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u62d6\u653e\u5230\u8fd9\u91cc<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>drop-zone<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>dropZone2<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u62d6\u653e\u5230\u8fd9\u91cc<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n        <span class=\"token comment\">\/\/ \u62d6\u62fd\u5143\u7d20<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> draggables <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelectorAll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;.draggable&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> dropZones <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelectorAll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;.drop-zone&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u62d6\u62fd\u5143\u7d20<\/span><br \/>\n        draggables<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">draggable<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            draggable<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;dragstart&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                e<span class=\"token punctuation\">.<\/span>dataTransfer<span class=\"token punctuation\">.<\/span><span class=\"token function\">setData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;text\/plain&#039;<\/span><span class=\"token punctuation\">,<\/span> draggable<span class=\"token punctuation\">.<\/span>dataset<span class=\"token punctuation\">.<\/span>type<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                e<span class=\"token punctuation\">.<\/span>dataTransfer<span class=\"token punctuation\">.<\/span>effectAllowed <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;move&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                draggable<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>opacity <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;0.5&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            draggable<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;dragend&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                draggable<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>opacity <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;1&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u653e\u7f6e\u533a\u57df<\/span><br \/>\n        dropZones<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">dropZone<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            dropZone<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;dragover&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                e<span class=\"token punctuation\">.<\/span><span class=\"token function\">preventDefault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                e<span class=\"token punctuation\">.<\/span>dataTransfer<span class=\"token punctuation\">.<\/span>dropEffect <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;move&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            dropZone<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;dragenter&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                e<span class=\"token punctuation\">.<\/span><span class=\"token function\">preventDefault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                dropZone<span class=\"token punctuation\">.<\/span>classList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;drag-over&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            dropZone<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;dragleave&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                dropZone<span class=\"token punctuation\">.<\/span>classList<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;drag-over&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            dropZone<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;drop&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                e<span class=\"token punctuation\">.<\/span><span class=\"token function\">preventDefault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                dropZone<span class=\"token punctuation\">.<\/span>classList<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;drag-over&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token keyword\">const<\/span> dataType <span class=\"token operator\">&#061;<\/span> e<span class=\"token punctuation\">.<\/span>dataTransfer<span class=\"token punctuation\">.<\/span><span class=\"token function\">getData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;text\/plain&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                dropZone<span class=\"token punctuation\">.<\/span>textContent <span class=\"token operator\">&#061;<\/span> <span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u653e\u7f6e\u4e86: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>dataType<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n                dropZone<span class=\"token punctuation\">.<\/span>classList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;dropped&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h4>10.2 \u6587\u4ef6\u62d6\u653e\u4e0a\u4f20<\/h4>\n<p><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token style\"><span class=\"token language-css\"><br \/>\n        <span class=\"token selector\">.upload-area<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">width<\/span><span class=\"token punctuation\">:<\/span> 400px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">height<\/span><span class=\"token punctuation\">:<\/span> 200px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border<\/span><span class=\"token punctuation\">:<\/span> 2px dashed #ccc<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border-radius<\/span><span class=\"token punctuation\">:<\/span> 10px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">display<\/span><span class=\"token punctuation\">:<\/span> flex<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">align-items<\/span><span class=\"token punctuation\">:<\/span> center<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">justify-content<\/span><span class=\"token punctuation\">:<\/span> center<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">margin<\/span><span class=\"token punctuation\">:<\/span> 20px auto<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">transition<\/span><span class=\"token punctuation\">:<\/span> all 0.3s<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">cursor<\/span><span class=\"token punctuation\">:<\/span> pointer<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token selector\">.upload-area.drag-over<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">border-color<\/span><span class=\"token punctuation\">:<\/span> #4CAF50<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">background<\/span><span class=\"token punctuation\">:<\/span> #e8f5e8<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">transform<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token function\">scale<\/span><span class=\"token punctuation\">(<\/span>1.02<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token selector\">.upload-area:hover<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">border-color<\/span><span class=\"token punctuation\">:<\/span> #999<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token selector\">.file-list<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">width<\/span><span class=\"token punctuation\">:<\/span> 400px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">margin<\/span><span class=\"token punctuation\">:<\/span> 20px auto<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token selector\">.file-item<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">padding<\/span><span class=\"token punctuation\">:<\/span> 10px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border<\/span><span class=\"token punctuation\">:<\/span> 1px solid #eee<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">margin<\/span><span class=\"token punctuation\">:<\/span> 5px 0<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border-radius<\/span><span class=\"token punctuation\">:<\/span> 5px<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token selector\">.progress-bar<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">width<\/span><span class=\"token punctuation\">:<\/span> 100%<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">height<\/span><span class=\"token punctuation\">:<\/span> 10px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">background<\/span><span class=\"token punctuation\">:<\/span> #f0f0f0<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border-radius<\/span><span class=\"token punctuation\">:<\/span> 5px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">overflow<\/span><span class=\"token punctuation\">:<\/span> hidden<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">margin-top<\/span><span class=\"token punctuation\">:<\/span> 5px<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token selector\">.progress-fill<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">height<\/span><span class=\"token punctuation\">:<\/span> 100%<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">background<\/span><span class=\"token punctuation\">:<\/span> #4CAF50<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">width<\/span><span class=\"token punctuation\">:<\/span> 0%<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">transition<\/span><span class=\"token punctuation\">:<\/span> width 0.3s<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>upload-area<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>uploadArea<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>uploadText<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u62d6\u62fd\u6587\u4ef6\u5230\u8fd9\u91cc\u6216\u70b9\u51fb\u9009\u62e9\u6587\u4ef6<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>file<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>fileInput<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">multiple<\/span> <span class=\"token style-attr\"><span class=\"token attr-name\">style<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span><span class=\"token style language-css\"><span class=\"token property\">display<\/span><span class=\"token punctuation\">:<\/span> none<span class=\"token punctuation\">;<\/span><\/span><span class=\"token punctuation\">&#034;<\/span><\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>file-list<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>fileList<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n        <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">FileUploader<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">constructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>uploadArea <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;uploadArea&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>fileInput <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;fileInput&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>fileList <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;fileList&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>files <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setupEventListeners<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">setupEventListeners<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u62d6\u62fd\u4e8b\u4ef6<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>uploadArea<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;dragover&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    e<span class=\"token punctuation\">.<\/span><span class=\"token function\">preventDefault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>uploadArea<span class=\"token punctuation\">.<\/span>classList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;drag-over&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>uploadArea<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;dragleave&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>uploadArea<span class=\"token punctuation\">.<\/span>classList<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;drag-over&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>uploadArea<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;drop&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    e<span class=\"token punctuation\">.<\/span><span class=\"token function\">preventDefault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>uploadArea<span class=\"token punctuation\">.<\/span>classList<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;drag-over&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">handleFiles<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">.<\/span>dataTransfer<span class=\"token punctuation\">.<\/span>files<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ \u70b9\u51fb\u4e8b\u4ef6<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>uploadArea<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;click&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>fileInput<span class=\"token punctuation\">.<\/span><span class=\"token function\">click<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>fileInput<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;change&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">handleFiles<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">.<\/span>target<span class=\"token punctuation\">.<\/span>files<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">handleFiles<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">fileList<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                Array<span class=\"token punctuation\">.<\/span><span class=\"token function\">from<\/span><span class=\"token punctuation\">(<\/span>fileList<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">file<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addFile<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">addFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">file<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> fileId <span class=\"token operator\">&#061;<\/span> Date<span class=\"token punctuation\">.<\/span><span class=\"token function\">now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">random<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> fileItem <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    id<span class=\"token operator\">:<\/span> fileId<span class=\"token punctuation\">,<\/span><br \/>\n                    file<span class=\"token operator\">:<\/span> file<span class=\"token punctuation\">,<\/span><br \/>\n                    name<span class=\"token operator\">:<\/span> file<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">,<\/span><br \/>\n                    size<span class=\"token operator\">:<\/span> file<span class=\"token punctuation\">.<\/span>size<span class=\"token punctuation\">,<\/span><br \/>\n                    type<span class=\"token operator\">:<\/span> file<span class=\"token punctuation\">.<\/span>type<span class=\"token punctuation\">,<\/span><br \/>\n                    progress<span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>files<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>fileItem<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">renderFileItem<\/span><span class=\"token punctuation\">(<\/span>fileItem<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">uploadFile<\/span><span class=\"token punctuation\">(<\/span>fileItem<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">renderFileItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">fileItem<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> div <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;div&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                div<span class=\"token punctuation\">.<\/span>className <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;file-item&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                div<span class=\"token punctuation\">.<\/span>id <span class=\"token operator\">&#061;<\/span> <span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">file-<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>fileItem<span class=\"token punctuation\">.<\/span>id<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n                div<span class=\"token punctuation\">.<\/span>innerHTML <span class=\"token operator\">&#061;<\/span> <span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\"><br \/>\n                    &lt;div&gt;&lt;strong&gt;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>fileItem<span class=\"token punctuation\">.<\/span>name<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">&lt;\/strong&gt;&lt;\/div&gt;<br \/>\n                    &lt;div&gt;\u5927\u5c0f: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span><span class=\"token punctuation\">(<\/span>fileItem<span class=\"token punctuation\">.<\/span>size <span class=\"token operator\">\/<\/span> <span class=\"token number\">1024<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toFixed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\"> KB&lt;\/div&gt;<br \/>\n                    &lt;div&gt;\u7c7b\u578b: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>fileItem<span class=\"token punctuation\">.<\/span>type <span class=\"token operator\">||<\/span> <span class=\"token string\">&#039;\u672a\u77e5&#039;<\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">&lt;\/div&gt;<br \/>\n                    &lt;div class&#061;&#034;progress-bar&#034;&gt;<br \/>\n                        &lt;div class&#061;&#034;progress-fill&#034; id&#061;&#034;progress-<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>fileItem<span class=\"token punctuation\">.<\/span>id<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">&#034;&gt;&lt;\/div&gt;<br \/>\n                    &lt;\/div&gt;<br \/>\n                <\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>fileList<span class=\"token punctuation\">.<\/span><span class=\"token function\">appendChild<\/span><span class=\"token punctuation\">(<\/span>div<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">updateProgress<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">fileId<span class=\"token punctuation\">,<\/span> progress<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> progressFill <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">progress-<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>fileId<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>progressFill<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    progressFill<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>width <span class=\"token operator\">&#061;<\/span> progress <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#039;%&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token keyword\">async<\/span> <span class=\"token function\">uploadFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">fileItem<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u6a21\u62df\u6587\u4ef6\u4e0a\u4f20<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> formData <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FormData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                formData<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;file&#039;<\/span><span class=\"token punctuation\">,<\/span> fileItem<span class=\"token punctuation\">.<\/span>file<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token comment\">\/\/ \u6a21\u62df\u4e0a\u4f20\u8fdb\u5ea6<\/span><br \/>\n                    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">let<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">await<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">delay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">updateProgress<\/span><span class=\"token punctuation\">(<\/span>fileItem<span class=\"token punctuation\">.<\/span>id<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><\/p>\n<p>                    <span class=\"token comment\">\/\/ \u6a21\u62df\u4e0a\u4f20\u5b8c\u6210<\/span><br \/>\n                    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u6587\u4ef6\u4e0a\u4f20\u6210\u529f:&#039;<\/span><span class=\"token punctuation\">,<\/span> fileItem<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u4e0a\u4f20\u5931\u8d25:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">delay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">ms<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Promise<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">resolve<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/span>resolve<span class=\"token punctuation\">,<\/span> ms<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u6587\u4ef6\u4e0a\u4f20\u5668<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> uploader <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FileUploader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h3>11. \u79bb\u7ebf\u5e94\u7528<\/h3>\n<h4>11.1 Application Cache (\u5df2\u5e9f\u5f03&#xff0c;\u63a8\u8350\u4f7f\u7528 Service Worker)<\/h4>\n<p><span class=\"token comment\">&lt;!&#8211; manifest \u5c5e\u6027 &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<\/span> <span class=\"token attr-name\">manifest<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>cache.manifest<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p># cache.manifest<br \/>\nCACHE MANIFEST<br \/>\n# \u7248\u672c 1.0<\/p>\n<p>CACHE:<br \/>\n# \u9700\u8981\u7f13\u5b58\u7684\u6587\u4ef6<br \/>\nindex.html<br \/>\nstyles.css<br \/>\nscript.js<br \/>\nimage.png<\/p>\n<p>NETWORK:<br \/>\n# \u9700\u8981\u8054\u7f51\u7684\u6587\u4ef6<br \/>\napi\/<br \/>\nlogin<\/p>\n<p>FALLBACK:<br \/>\n# \u79bb\u7ebf\u65f6\u7684\u66ff\u4ee3\u6587\u4ef6<br \/>\n\/ \/offline.html<\/p>\n<h4>11.2 Service Worker (\u63a8\u8350)<\/h4>\n<p><span class=\"token comment\">\/\/ sw.js &#8211; Service Worker<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token constant\">CACHE_NAME<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;my-app-v1&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> urlsToCache <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><br \/>\n    <span class=\"token string\">&#039;\/&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#039;\/styles\/main.css&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#039;\/script\/main.js&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#039;\/images\/logo.png&#039;<\/span><br \/>\n<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b89\u88c5 Service Worker<\/span><br \/>\nself<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;install&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">event<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    event<span class=\"token punctuation\">.<\/span><span class=\"token function\">waitUntil<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        caches<span class=\"token punctuation\">.<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">CACHE_NAME<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">cache<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u7f13\u5b58\u5df2\u6253\u5f00&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">addAll<\/span><span class=\"token punctuation\">(<\/span>urlsToCache<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u62e6\u622a\u7f51\u7edc\u8bf7\u6c42<\/span><br \/>\nself<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;fetch&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">event<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    event<span class=\"token punctuation\">.<\/span><span class=\"token function\">respondWith<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        caches<span class=\"token punctuation\">.<\/span><span class=\"token function\">match<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">.<\/span>request<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">response<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u5982\u679c\u7f13\u5b58\u4e2d\u6709&#xff0c;\u8fd4\u56de\u7f13\u5b58\u7684\u54cd\u5e94<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">return<\/span> response<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ \u5426\u5219\u53d1\u8d77\u7f51\u7edc\u8bf7\u6c42<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">.<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">response<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token comment\">\/\/ \u68c0\u67e5\u54cd\u5e94\u662f\u5426\u6709\u6548<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>response <span class=\"token operator\">||<\/span> response<span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">!&#061;&#061;<\/span> <span class=\"token number\">200<\/span> <span class=\"token operator\">||<\/span> response<span class=\"token punctuation\">.<\/span>type <span class=\"token operator\">!&#061;&#061;<\/span> <span class=\"token string\">&#039;basic&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">return<\/span> response<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><\/p>\n<p>                    <span class=\"token comment\">\/\/ \u514b\u9686\u54cd\u5e94\u5e76\u7f13\u5b58<\/span><br \/>\n                    <span class=\"token keyword\">const<\/span> responseToCache <span class=\"token operator\">&#061;<\/span> response<span class=\"token punctuation\">.<\/span><span class=\"token function\">clone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    caches<span class=\"token punctuation\">.<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">CACHE_NAME<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">cache<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                            cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">.<\/span>request<span class=\"token punctuation\">,<\/span> responseToCache<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token keyword\">return<\/span> response<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u66f4\u65b0 Service Worker<\/span><br \/>\nself<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;activate&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">event<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> cacheWhitelist <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token constant\">CACHE_NAME<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    event<span class=\"token punctuation\">.<\/span><span class=\"token function\">waitUntil<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        caches<span class=\"token punctuation\">.<\/span><span class=\"token function\">keys<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">cacheNames<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> Promise<span class=\"token punctuation\">.<\/span><span class=\"token function\">all<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                cacheNames<span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">cacheName<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cacheWhitelist<span class=\"token punctuation\">.<\/span><span class=\"token function\">indexOf<\/span><span class=\"token punctuation\">(<\/span>cacheName<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">return<\/span> caches<span class=\"token punctuation\">.<\/span><span class=\"token function\">delete<\/span><span class=\"token punctuation\">(<\/span>cacheName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ main.js &#8211; \u6ce8\u518c Service Worker<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;serviceWorker&#039;<\/span> <span class=\"token keyword\">in<\/span> navigator<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    window<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;load&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        navigator<span class=\"token punctuation\">.<\/span>serviceWorker<span class=\"token punctuation\">.<\/span><span class=\"token function\">register<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/sw.js&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">registration<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Service Worker \u6ce8\u518c\u6210\u529f:&#039;<\/span><span class=\"token punctuation\">,<\/span> registration<span class=\"token punctuation\">.<\/span>scope<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">catch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">error<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Service Worker \u6ce8\u518c\u5931\u8d25:&#039;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>12. \u6027\u80fd\u4f18\u5316<\/h3>\n<h4>12.1 \u56fe\u7247\u61d2\u52a0\u8f7d<\/h4>\n<p><span class=\"token comment\">&lt;!&#8211; \u4f7f\u7528 loading&#061;&#034;lazy&#034; \u5c5e\u6027 &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>img<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>image.jpg<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">alt<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>\u56fe\u7247\u63cf\u8ff0<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">loading<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>lazy<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">&lt;!&#8211; \u4f7f\u7528 Intersection Observer API &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>lazy-image<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">data-src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>image.jpg<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>img<\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>placeholder.jpg<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">alt<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>\u56fe\u7247\u63cf\u8ff0<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n<span class=\"token comment\">\/\/ \u81ea\u5b9a\u4e49\u61d2\u52a0\u8f7d\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LazyLoader<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">constructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>imageObserver <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;IntersectionObserver&#039;<\/span> <span class=\"token keyword\">in<\/span> window<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>imageObserver <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IntersectionObserver<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">entries<span class=\"token punctuation\">,<\/span> observer<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                entries<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">entry<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>entry<span class=\"token punctuation\">.<\/span>isIntersecting<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">const<\/span> img <span class=\"token operator\">&#061;<\/span> entry<span class=\"token punctuation\">.<\/span>target<span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">const<\/span> realSrc <span class=\"token operator\">&#061;<\/span> img<span class=\"token punctuation\">.<\/span>dataset<span class=\"token punctuation\">.<\/span>src<span class=\"token punctuation\">;<\/span><\/p>\n<p>                        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>realSrc<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                            img<span class=\"token punctuation\">.<\/span>src <span class=\"token operator\">&#061;<\/span> realSrc<span class=\"token punctuation\">;<\/span><br \/>\n                            img<span class=\"token punctuation\">.<\/span><span class=\"token function\">removeAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;data-src&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>imageObserver<span class=\"token punctuation\">.<\/span><span class=\"token function\">unobserve<\/span><span class=\"token punctuation\">(<\/span>img<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u89c2\u5bdf\u6240\u6709\u61d2\u52a0\u8f7d\u56fe\u7247<\/span><br \/>\n            <span class=\"token keyword\">const<\/span> lazyImages <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelectorAll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;[data-src]&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            lazyImages<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">img<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>imageObserver<span class=\"token punctuation\">.<\/span><span class=\"token function\">observe<\/span><span class=\"token punctuation\">(<\/span>img<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u61d2\u52a0\u8f7d<\/span><br \/>\n<span class=\"token keyword\">const<\/span> lazyLoader <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LazyLoader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h4>12.2 \u9884\u52a0\u8f7d\u548c\u9884\u83b7\u53d6<\/h4>\n<p><span class=\"token comment\">&lt;!&#8211; DNS \u9884\u89e3\u6790 &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>link<\/span> <span class=\"token attr-name\">rel<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>dns-prefetch<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>\/\/example.com<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">&lt;!&#8211; \u9884\u8fde\u63a5 &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>link<\/span> <span class=\"token attr-name\">rel<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>preconnect<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>https:\/\/fonts.googleapis.com<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token 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