{"id":112959,"date":"2026-10-05T09:57:09","date_gmt":"2026-10-05T01:57:09","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/112959.html"},"modified":"2026-10-05T09:57:09","modified_gmt":"2026-10-05T01:57:09","slug":"%e5%89%8d%e7%ab%af%e5%85%a5%e9%97%a8%e7%ac%ac%e4%b8%89%e8%af%be%ef%bc%9ajs-%e6%a0%b8%e5%bf%83%e8%af%ad%e6%b3%95%ef%bc%88%e5%8f%98%e9%87%8f-%e6%95%b0%e7%bb%84-%e5%87%bd%e6%95%b0%ef%bc%89-dom","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/112959.html","title":{"rendered":"\u524d\u7aef\u5165\u95e8\u7b2c\u4e09\u8bfe\uff1aJS \u6838\u5fc3\u8bed\u6cd5\uff08\u53d8\u91cf \/ \u6570\u7ec4 \/ \u51fd\u6570\uff09+ DOM \u64cd\u4f5c\u7cbe\u8bb2"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>javascript(\u57fa\u7840\u8bed\u6cd5)<\/li>\n<li>\n<ul>\n<li>\u8f93\u5165\u8f93\u51fa<\/li>\n<li>\u53d8\u91cf\u7684\u4f7f\u7528<\/li>\n<li>\u6570\u7ec4<\/li>\n<li>\u51fd\u6570<\/li>\n<li>\u5bf9\u8c61<\/li>\n<\/ul>\n<\/li>\n<li>javascript(webapi)<\/li>\n<\/ul>\n<h2>javascript(\u57fa\u7840\u8bed\u6cd5)<\/h2>\n<p>javascript\u7684\u4e66\u5199\u5f62\u5f0f:<\/p>\n<p>1.\u884c\u5185\u5f0f:\u76f4\u63a5\u5d4c\u5165\u5230html\u5143\u7d20\u5185\u90e8<\/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>button<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>\u70b9\u6211\u4e00\u4e0b<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token special-attr\"><span class=\"token attr-name\">onclick<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span><span class=\"token value javascript language-javascript\"><span class=\"token function\">alert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;haha&#039;<\/span><span class=\"token punctuation\">)<\/span><\/span><span class=\"token punctuation\">&#034;<\/span><\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>\u6ce8\u610f&#xff0c;JS \u4e2d\u5b57\u7b26\u4e32\u5e38\u91cf\u53ef\u4ee5\u4f7f\u7528\u5355\u5f15\u53f7\u8868\u793a&#xff0c;\u4e5f\u53ef\u4ee5 \u4f7f\u7528\u53cc\u5f15\u53f7\u8868\u793a\u2014HTML \u4e2d\u63a8\u8350\u4f7f\u7528\u53cc\u5f15\u53f7&#xff0c;JS \u4e2d\u63a8\u8350\u4f7f\u7528\u5355\u5f15\u53f7.<\/p>\n<p>2.\u5185\u5d4c\u5f0f:\u5199\u5230html\u7684script\u6807\u7b7e\u91cc\u9762<\/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 function\">alert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;haha&#034;<\/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>3.\u5916\u90e8\u5f0f:\u5199\u5230\u5355\u72ec\u7684js\u6587\u4ef6\u91cc\u9762<\/p>\n<p>\u2013\u901a\u8fc7 &lt;script&gt; \u6807\u7b7e\u7684 src \u5c5e\u6027\u6307\u5b9a\u5916\u90e8 .js \u6587\u4ef6\u8def\u5f84&#xff08;\u5982 hello.js&#xff09;&#xff0c;\u6d4f\u89c8\u5668\u4f1a\u81ea\u52a8\u52a0\u8f7d\u5e76\u6267\u884c\u8be5\u6587\u4ef6\u4e2d\u7684\u4ee3\u7801<\/p>\n<p>\u2013\u6ce8\u610f:\u5f53 &lt;script&gt; \u6807\u7b7e\u8bbe\u7f6e\u4e86 src \u5c5e\u6027\u65f6&#xff0c;\u6807\u7b7e\u5185\u90e8\u4e0d\u80fd\u518d\u5199 JavaScript \u4ee3\u7801&#xff0c;\u5373\u4f7f\u5199\u4e86\u4e5f\u4e0d\u4f1a\u88ab\u6267\u884c<\/p>\n<p> html\u6587\u4ef6\u4e2d:<br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/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>hello.js<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><\/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>hello.js\u4e2d:<br \/>\nalert(&#034;hehe&#034;);<\/p>\n<p>javascript\u4e2d\u6ce8\u91ca\u7684\u65b9\u6cd5:\/\/\u548c\/**\/<\/p>\n<h3>\u8f93\u5165\u8f93\u51fa<\/h3>\n<p>prompt:<\/p>\n<p> <span class=\"token comment\">\/\/ \u8f93\u5165: prompt&#xff08;\u5f39\u51fa\u8f93\u5165\u6846&#xff09;<\/span><br \/>\n<span class=\"token function\">prompt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u60a8\u7684\u59d3\u540d:&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>alert:<\/p>\n<p> <span class=\"token comment\">\/\/ \u8f93\u51fa: alert&#xff08;\u5f39\u51fa\u8b66\u793a\u5bf9\u8bdd\u6846&#xff09;<\/span><br \/>\n<span class=\"token function\">alert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hello&#034;<\/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\">&#034;\u60a8\u7684\u59d3\u540d\u662f&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\\\\n&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u60a8\u7684\u5e74\u9f84\u662f&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> age <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\\\\n&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u60a8\u7684\u5206\u6570\u662f&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> score <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>console.log:<\/p>\n<p> <span class=\"token comment\">\/\/ \u5411\u63a7\u5236\u53f0\u8f93\u51fa\u65e5\u5fd7<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fd9\u662f\u4e00\u6761\u65e5\u5fd7&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u2013\u4f46\u662f\u8fd9\u4e2a\u64cd\u4f5c\u53ef\u4ee5\u901a\u8fc7\u5728vscode\u4e2d\u8f93\u5165log\u7136\u540e\u518d\u6309tab\u5feb\u901f\u8f93\u5165console.log<\/p>\n<p>\u2013\u8fd9\u4e2a\u65e5\u5fd7\u4fe1\u606f\u5728\u6d4f\u89c8\u5668\u7684\u5f00\u53d1\u8005\u5de5\u5177\u91cc\u9762\u7684console\u6807\u7b7e\u9875\u624d\u80fd\u770b\u5230\u7ed3\u679c<\/p>\n<p> {: id&#061;&#034;20260510082658-f1p46ga&#034; updated&#061;&#034;20260510082703&#034;}<\/p>\n<h3>\u53d8\u91cf\u7684\u4f7f\u7528<\/h3>\n<p>\u521b\u5efa\u53d8\u91cf:<\/p>\n<p> <span class=\"token keyword\">var<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;zhangsan&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">var<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">var<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">prompt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u5e74\u9f84&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u2013\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u521d\u59cb\u5316\u503c&#xff0c;\u9700\u8981\u7528\u5355\u5f15\u53f7\u6216\u53cc\u5f15\u53f7\u5305\u88f9&#xff1b;\u6570\u5b57\u7c7b\u578b\u7684\u521d\u59cb\u5316\u503c\u53ef\u76f4\u63a5\u8d4b\u503c&#xff0c;\u65e0\u9700\u5f15\u53f7<\/p>\n<p>\u2013\u5728JS\u4e2d&#xff0c;\u5982\u679c\u5b9a\u4e49\u4e00\u4e2a\u53d8\u91cf\u4e0d\u4f7f\u7528let\/var&#xff0c;\u6b64\u65f6\u8fd9\u8ddf\u53d8\u91cf\u5c31\u4f1a\u53d8\u6210\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf<\/p>\n<p>\u4f7f\u7528\u53d8\u91cf:<\/p>\n<p> console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>age<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8bfb\u53d6\u53d8\u91cf age \u7684\u503c&#xff0c;\u7136\u540e\u628a\u8fd9\u4e2a\u503c\u4f5c\u4e3a\u65e5\u5fd7\u6253\u5370\u51fa\u6765<\/span><br \/>\nage <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">;<\/span>         <span class=\"token comment\">\/\/ \u4fee\u6539\u53d8\u91cf\u5185\u5bb9<\/span><\/p>\n<p>js\u4e2d\u53d8\u91cf\u7684\u7c7b\u578b\u662f\u52a8\u6001\u7c7b\u578b!<\/p>\n<p>\u2013JS \u7684\u53d8\u91cf\u7c7b\u578b\u662f\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u624d\u786e\u5b9a\u7684<\/p>\n<p>\u2013\u968f\u7740\u7a0b\u5e8f\u8fd0\u884c&#xff0c;\u53d8\u91cf\u7684\u7c7b\u578b\u53ef\u80fd\u4f1a\u53d1\u751f\u6539\u53d8<\/p>\n<p>js\u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b:<\/p>\n<p>number: \u6570\u5b57\u7c7b\u578b&#xff0c;\u4e0d\u533a\u5206\u6574\u6570\u548c\u5c0f\u6570&#xff08;\u7edf\u4e00\u7528 64 \u4f4d\u6d6e\u70b9\u6570\u5b58\u50a8&#xff09;\u2013\u53ef\u4ee5\u7528n\u8fdb\u5236\u7684\u65b9\u5f0f\u8868\u793a\u6570\u5b57<\/p>\n<p>\u5176\u4e2d:<\/p>\n<p>Infinity: \u65e0\u7a77\u5927, \u5927\u4e8e\u4efb\u4f55\u6570\u5b57. \u8868\u793a\u6570\u5b57\u5df2\u7ecf\u8d85\u8fc7\u4e86 JS \u80fd\u8868\u793a\u7684\u8303\u56f4.<\/p>\n<p>-Infinity: \u8d1f\u65e0\u7a77\u5927, \u5c0f\u4e8e\u4efb\u4f55\u6570\u5b57. \u8868\u793a\u6570\u5b57\u5df2\u7ecf\u8d85\u8fc7\u4e86 JS \u80fd\u8868\u793a\u7684\u8303\u56f4.<\/p>\n<p>NaN: \u8868\u793a\u5f53\u524d\u7684\u7ed3\u679c\u4e0d\u662f\u4e00\u4e2a\u6570\u5b57.<\/p>\n<p>  <span class=\"token literal-property property\">eg<\/span><span class=\"token operator\">:<\/span><br \/>\nonsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;hehe&#039;<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u5f97\u5230 NaN&#xff08;\u5b57\u7b26\u4e32\u4e0e\u6570\u5b57\u76f8\u51cf&#xff0c;\u65e0\u6cd5\u8f6c\u4e3a\u6709\u6548\u6570\u5b57&#xff09;,\u4f46\u662f&#039;hehe&#039;&#043;10\u7684\u7ed3\u679c\u662fhehe10!!!<\/span><br \/>\n<span class=\"token operator\">&#8212;<\/span>\u5f15\u7533<span class=\"token operator\">:<\/span>\u53ef\u4ee5\u4f7f\u7528 isNaN \u5224\u65ad\u975e\u6570\u5b57<br \/>\n<span class=\"token function\">isNaN<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\u4f1a\u8fd4\u56de<span class=\"token boolean\">false<\/span><\/p>\n<p>boolean: \u5e03\u5c14\u7c7b\u578b&#xff0c;\u5305\u542b true&#xff08;\u771f&#xff09;\u548c false&#xff08;\u5047&#xff09;\u4e24\u4e2a\u503c<\/p>\n<p>string: 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class=\"token punctuation\">;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;10&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;undefined10<\/span><\/p>\n<p>undefined \u548c\u6570\u5b57\u8fdb\u884c\u76f8\u52a0\u65f6&#xff0c;\u7ed3\u679c\u4e3a NaN&#xff08;\u975e\u6570\u5b57&#xff09;<\/p>\n<p>  console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;NaN<\/span><\/p>\n<p>null: \u53ea\u6709\u552f\u4e00\u503c null&#xff0c;\u8868\u793a\u201c\u7a7a\u503c\u201d\u6216\u201c\u4e0d\u5b58\u5728\u7684\u5bf9\u8c61\u201d<\/p>\n<p> <span class=\"token keyword\">var<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>b <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;10<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>b <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;10&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;null10<\/span><\/p>\n<p>\u8ddfundefined\u7684\u533a\u522b:null \u8868\u793a\u5f53\u524d\u7684\u503c\u4e3a\u7a7a;undefined \u8868\u793a\u5f53\u524d\u7684\u53d8\u91cf\u672a\u5b9a\u4e49<\/p>\n<p>\u76f8\u5173\u8fd0\u7b97\u7b26\u7684\u8bdd\u8ddfcpp\u5dee\u4e0d\u591a&#xff0c;\u5c31\u4e0d\u4ecb\u7ecd\u4e86&#xff0c;\u6bd4\u5982&#043;-*\/% \u8fd8\u6709\u4f4d\u8fd0\u7b97\u90a3\u4e9b<\/p>\n<p>\u4f46\u662fjs\u591a\u4e86\u4e00\u4e9b:&#061;&#061;&#061;\u4e25\u683c\u7b49\u4e8e(&#061;&#061;\u53ea\u8981\u6c42\u503c\u76f8\u7b49&#xff0c;&#061;&#061;&#061;\u8fd8\u8981\u6c42\u7c7b\u578b\u4e5f\u4e00\u6837\u624d\u884c) !&#061;&#061;\u4e25\u683c\u4e0d\u7b49\u4e8e<\/p>\n<p>\u6761\u4ef6\u8bed\u53e5:if\u8bed\u53e5,\u4e09\u5143\u8868\u8fbe\u5f0f,switch<\/p>\n<p>\u5faa\u73af\u8bed\u53e5:while,for\u5faa\u73af&#xff0c;\u4ee5\u53cacontinue\u548cbreak<\/p>\n<p>\u2013\u4ee5\u4e0a\u8fd9\u4e9b\u90fd\u8ddfcpp\u7684\u7528\u6cd5\u4e00\u81f4<\/p>\n<h3>\u6570\u7ec4<\/h3>\n<p>\u6ce8\u610f:js\u7684\u6570\u7ec4\u4e0d\u8981\u6c42\u5143\u7d20\u662f\u76f8\u540c\u7c7b\u578b<\/p>\n<p>\u521b\u5efa\u6570\u7ec4:var arr &#061; new Array();\u6216\u8005var arr &#061; [];\u6216var arr2 &#061; [1, 2, &#039;haha&#039;, false];<\/p>\n<p>\u8bbf\u95ee\u5143\u7d20:<\/p>\n<p> <span class=\"token keyword\">var<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;\u5c0f\u732a\u4f69\u5947&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u5c0f\u732a\u4e54\u6cbb&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u5c0f\u7f8a\u82cf\u897f&#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>arr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u8f93\u51fa\u5168\u90e8\u5185\u5bb9<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8bbf\u95ee\u7b2c1\u4e2a\u5143\u7d20&#xff1a;\u5c0f\u732a\u4f69\u5947<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u5982\u679c\u4e0b\u6807\u8d85\u51fa\u6570\u7ec4\u7684\u6709\u6548\u8303\u56f4&#xff08;\u5305\u62ec\u8d1f\u6570\u4e0b\u6807&#xff09;&#xff0c;\u8bfb\u53d6\u5143\u7d20\u7684\u7ed3\u679c\u4e3a undefined<\/span><br \/>\narr <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;\u5c0f\u732b\u51ef\u8fea&#039;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u76f4\u63a5\u7ed9\u6570\u7ec4\u53d8\u91cf\u8d4b\u503c\u4f1a\u5bfc\u81f4\u539f\u6570\u7ec4\u4e22\u5931&#xff0c;\u53d8\u91cf\u7c7b\u578b\u4f1a\u88ab\u6539\u53d8<\/span><\/p>\n<p>\u65b0\u589e\u6570\u7ec4\u5143\u7d20:<\/p>\n<p> <span class=\"token number\">1.<\/span>\u901a\u8fc7\u4fee\u6539 length \u65b0\u589e\u5143\u7d20<span class=\"token operator\">:<\/span>\u65b0\u589e\u7684\u5143\u7d20\u9ed8\u8ba4\u503c\u4e3a <span class=\"token keyword\">undefined<\/span><br \/>\n<span class=\"token keyword\">var<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5c06\u6570\u7ec4\u957f\u5ea6\u4ece4\u6539\u4e3a6&#xff0c;\u65b0\u589e2\u4e2a\u5143\u7d20<\/span><\/p>\n<p><span class=\"token number\">2.<\/span><span class=\"token literal-property property\">\u901a\u8fc7\u4e0b\u6807\u65b0\u589e\u5143\u7d20<\/span><span class=\"token operator\">:<\/span><br \/>\n\u5982\u679c\u8d4b\u503c\u7684\u4e0b\u6807\u8d85\u51fa\u6570\u7ec4\u5f53\u524d\u957f\u5ea6&#xff0c;\u4f1a\u5728\u6307\u5b9a\u4f4d\u7f6e\u63d2\u5165\u65b0\u5143\u7d20&#xff0c;\u4e2d\u95f4\u672a\u8d4b\u503c\u7684\u4e0b\u6807\u4f1a\u88ab\u586b\u5145\u4e3a <span class=\"token keyword\">undefined<\/span><br \/>\n<span class=\"token keyword\">var<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\narr<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span> <\/p>\n<p><span class=\"token number\">3.<\/span>\u901a\u8fc7push\u8fdb\u884c\u8ffd\u52a0\u5143\u7d20<br \/>\n<span class=\"token keyword\">var<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">var<\/span> newArr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\nnewArr<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5220\u9664\u6570\u7ec4\u4e2d\u7684\u5143\u7d20:<\/p>\n<p> <span class=\"token keyword\">var<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7b2c\u4e00\u4e2a\u53c2\u6570\u8868\u793a\u4ece\u4e0b\u6807\u4e3a 2 \u7684\u4f4d\u7f6e\u5f00\u59cb\u5220\u9664&#xff0c;\u7b2c\u4e8c\u4e2a\u53c2\u6570\u8868\u793a\u8981\u5220\u9664\u7684\u5143\u7d20\u4e2a\u6570\u662f 1 \u4e2a<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">splice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u51fd\u6570<\/h3>\n<p>js\u7684\u51fd\u6570\u8ddfcpp\u7684\u5176\u5b9e\u5dee\u4e0d\u591a&#xff0c;\u4f46\u662fjs\u7684\u51fd\u6570\u53ef\u4ee5\u7528\u4f5c\u53d8\u91cf<\/p>\n<p> <span class=\"token keyword\">var<\/span> <span class=\"token function-variable function\">add<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">var<\/span> sum <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">var<\/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> arguments<span class=\"token punctuation\">.<\/span>length<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        sum <span class=\"token operator\">&#043;&#061;<\/span> arguments<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> sum<span class=\"token punctuation\">;<\/span><br \/>\n<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 function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;30<\/span><\/p>\n<h3>\u5bf9\u8c61<\/h3>\n<p>\u6ce8\u610f:javascript\u91cc\u9762\u6ca1\u6709\u7c7b&#xff0c;\u591a\u6001&#xff0c;\u4e0d\u533a\u5206\u5c5e\u6027\u548c\u65b9\u6cd5&#xff0c;\u6ca1\u6709private\/public\u7b49\u8bbf\u95ee\u63a7\u5236\u673a\u5236,\u6ca1\u6709\u7ee7\u627f<\/p>\n<p>\u521b\u5efa\u5bf9\u8c61:<\/p>\n<p>1.\u7528\u5b57\u9762\u91cf\u8fdb\u884c\u521b\u5efa\u5bf9\u8c61:<\/p>\n<p>  <span class=\"token comment\">\/\/ \u521b\u5efa\u7a7a\u5bf9\u8c61<\/span><br \/>\n<span class=\"token keyword\">var<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u521b\u5efa\u5305\u542b\u5c5e\u6027\u548c\u65b9\u6cd5\u7684\u5bf9\u8c61<\/span><br \/>\n<span class=\"token keyword\">var<\/span> student <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token literal-property property\">name<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;\u8521\u5f90\u5764&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token literal-property property\">height<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">175<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token literal-property property\">weight<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">170<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token function-variable function\">sayHello<\/span><span class=\"token operator\">:<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/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\">&#034;hello&#034;<\/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>2.\u4f7f\u7528new object\u6765\u521b\u5efa\u5bf9\u8c61<\/p>\n<p>  <span class=\"token keyword\">var<\/span> student <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/p>\n<p><span class=\"token comment\">\/\/ \u52a8\u6001\u6dfb\u52a0\u5c5e\u6027&#xff1a;\u652f\u6301 . \u8bed\u6cd5<\/span><br \/>\nstudent<span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u8521\u5f90\u5764&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nstudent<span class=\"token punctuation\">.<\/span>height <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">175<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u52a8\u6001\u6dfb\u52a0\u5c5e\u6027&#xff1a;\u4e5f\u652f\u6301 [] \u8bed\u6cd5<\/span><br \/>\nstudent<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;weight&#039;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">170<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u52a8\u6001\u6dfb\u52a0\u65b9\u6cd5<\/span><br \/>\nstudent<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">sayHello<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token punctuation\">(<\/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\">&#034;hello&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>3.\u4f7f\u7528\u6784\u9020\u51fd\u6570\u521b\u5efa\u5bf9\u8c61:<\/p>\n<p>  <span class=\"token keyword\">var<\/span> mimi <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token literal-property property\">name<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#034;\u54aa\u54aa&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token literal-property property\">type<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#034;\u4e2d\u534e\u7530\u56ed\u55b5&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token function-variable function\">miao<\/span><span class=\"token operator\">:<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token punctuation\">(<\/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\">&#034;\u55b5&#034;<\/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 keyword\">function<\/span> <span class=\"token function\">Cat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">name<span class=\"token punctuation\">,<\/span> type<span class=\"token punctuation\">,<\/span> sound<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ this \u6307\u5411\u5f53\u524d\u6b63\u5728\u521b\u5efa\u7684\u5b9e\u4f8b<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>type <span class=\"token operator\">&#061;<\/span> type<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">miao<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/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>sound<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<p><span class=\"token comment\">\/\/ \u5fc5\u987b\u7528 new \u8c03\u7528&#xff0c;\u521b\u5efa\u5b9e\u4f8b<\/span><br \/>\n<span class=\"token keyword\">var<\/span> mimi <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Cat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u54aa\u54aa&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u4e2d\u534e\u7530\u56ed\u55b5&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u55b5&#034;<\/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>mimi<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u54aa\u54aa<\/span><br \/>\nmimi<span class=\"token punctuation\">.<\/span><span class=\"token function\">miao<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u55b5<\/span><\/p>\n<p>\u4f7f\u7528\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5:<\/p>\n<p> <span class=\"token comment\">\/\/ 1. \u4f7f\u7528 . \u6210\u5458\u8bbf\u95ee\u8fd0\u7b97\u7b26\u6765\u8bbf\u95ee\u5c5e\u6027<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>student<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 2. \u4f7f\u7528 [] \u8bbf\u95ee\u5c5e\u6027&#xff0c;\u6b64\u65f6\u5c5e\u6027\u9700\u8981\u52a0\u4e0a\u5f15\u53f7<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>student<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;height&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 3. \u8c03\u7528\u65b9\u6cd5<\/span><br \/>\nstudent<span class=\"token punctuation\">.<\/span><span class=\"token function\">sayHello<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h2>javascript(webapi)<\/h2>\n<p>Web API | MDN\u91cc\u9762\u7684webapi\u5f88\u5168<\/p>\n<p>JS \u5206\u6210\u4e09\u4e2a\u5927\u7684\u90e8\u5206<\/p>\n<p>ECMAScript: \u57fa\u7840\u8bed\u6cd5\u90e8\u5206 DOM API: \u64cd\u4f5c\u9875\u9762\u7ed3\u6784 BOM API: \u64cd\u4f5c\u6d4f\u89c8\u5668<\/p>\n<p>WebAPI \u5c31\u5305\u542b\u4e86 DOM &#043; BOM<\/p>\n<p>DOM\u6811\u7684\u7ed3\u6784:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261005015708-6ac303f468a4a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u6587\u6863: \u4e00\u4e2a\u9875\u9762\u5c31\u662f\u4e00\u4e2a\u6587\u6863, \u4f7f\u7528 document \u8868\u793a.<\/p>\n<p>\u5143\u7d20: \u9875\u9762\u4e2d\u6240\u6709\u7684\u6807\u7b7e\u90fd\u79f0\u4e3a \u5143\u7d20. \u4f7f\u7528 element \u8868\u793a.<\/p>\n<p>\u8282\u70b9: \u7f51\u9875\u4e2d\u6240\u6709\u7684\u5185\u5bb9\u90fd\u53ef\u4ee5\u79f0\u4e3a \u8282\u70b9(\u6807\u7b7e\u8282\u70b9, \u6ce8\u91ca\u8282\u70b9, \u6587\u672c\u8282\u70b9, \u5c5e\u6027\u8282\u70b9\u7b49). \u4f7f\u7528 node \u8868\u793a.<\/p>\n<p>\u83b7\u53d6\u5143\u7d20:<\/p>\n<p>querySelector:HTML5 \u65b0\u589e\u7684 DOM \u65b9\u6cd5&#xff0c;IE9 \u53ca\u4ee5\u4e0a\u7248\u672c\u6d4f\u89c8\u5668\u652f\u6301<\/p>\n<p>\u2013\u82e5\u9700\u8981\u83b7\u53d6\u6240\u6709\u5339\u914d\u7684\u5143\u7d20\u5217\u8868&#xff0c;\u4f7f\u7528\u914d\u5957\u65b9\u6cd5 querySelectorAll(),\u8fd9\u4fe9\u5c31\u8fd4\u56de\u503c\u4e0d\u540c<\/p>\n<p> <span class=\"token keyword\">var<\/span> element <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span>selectors<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>selectors&#xff1a;\u5fc5\u586b&#xff0c;\u7c7b\u578b\u4e3a <span class=\"token constant\">DOM<\/span> \u5b57\u7b26\u4e32&#xff0c;\u5fc5\u987b\u662f\u6709\u6548\u7684 <span class=\"token constant\">CSS<\/span> \u9009\u62e9\u5668<br \/>\n&#xff08;\u5982\u7c7b\u9009\u62e9\u5668<span class=\"token punctuation\">.<\/span>box\u3001<span class=\"token constant\">ID<\/span> \u9009\u62e9\u5668#id\u3001\u6807\u7b7e\u9009\u62e9\u5668div\u3001\u7ec4\u5408\u9009\u62e9\u5668h3 span input\u7b49&#xff09;&#xff0c;\u5426\u5219\u4f1a\u629b\u51fa<span class=\"token constant\">SYNTAX_ERR<\/span>\u8bed\u6cd5\u9519\u8bef\u3002<br \/>\n\u8fd4\u56de\u503c&#xff1a;\u6587\u6863\u4e2d\u4e0e\u9009\u62e9\u5668\u5339\u914d\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u5bf9\u8c61&#xff0c;\u5982\u679c\u6ca1\u6709\u5339\u914d\u9879\u5219\u8fd4\u56de<span class=\"token keyword\">null<\/span>\u3002<span class=\"token operator\">&#8212;<\/span>querySelectorAll\u8fd4\u56de\u7684\u662f\u6240\u6709\u7b26\u5408\u7684\u5143\u7d20<\/p>\n<p>\u64cd\u4f5c\u5143\u7d20:<\/p>\n<p>\u83b7\u53d6\/\u4fee\u6539\u5143\u7d20\u5185\u5bb9:<\/p>\n<p>innerText:\u53ea\u5904\u7406\u7eaf\u6587\u672c,\u4e0d\u89e3\u6790HTML\u6807\u7b7e&#xff0c;\u628a\u6240\u6709\u6807\u7b7e\u5f53\u4f5c\u666e\u901a\u6587\u5b57<\/p>\n<p> <span class=\"token comment\">\/\/ \u8bfb\u64cd\u4f5c<\/span><br \/>\n<span class=\"token keyword\">var<\/span> renderedText <span class=\"token operator\">&#061;<\/span> HTMLElement<span class=\"token punctuation\">.<\/span>innerText<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5199\u64cd\u4f5c<\/span><br \/>\nHTMLElement<span class=\"token punctuation\">.<\/span>innerText <span class=\"token operator\">&#061;<\/span> string<span class=\"token punctuation\">;<\/span><\/p>\n<p>innerHTML:\u5904\u7406\u5b8c\u6574\u7684HTML\u7ed3\u6784<\/p>\n<p> <span class=\"token comment\">\/\/ \u8bfb\u64cd\u4f5c&#xff1a;\u83b7\u53d6\u5143\u7d20\u5185\u90e8\u7684HTML\u5185\u5bb9&#xff08;\u5305\u542b\u6807\u7b7e\u548c\u6587\u672c&#xff09;<\/span><br \/>\n<span class=\"token keyword\">var<\/span> content <span class=\"token operator\">&#061;<\/span> element<span class=\"token punctuation\">.<\/span>innerHTML<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5199\u64cd\u4f5c&#xff1a;\u8bbe\u7f6e\u5143\u7d20\u5185\u90e8\u7684HTML\u5185\u5bb9&#xff08;\u6d4f\u89c8\u5668\u4f1a\u89e3\u6790HTML\u6807\u7b7e\u5e76\u6e32\u67d3&#xff09;<\/span><br \/>\nelement<span class=\"token punctuation\">.<\/span>innerHTML <span class=\"token operator\">&#061;<\/span> htmlString<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u83b7\u53d6\/\u4fee\u6539\u5143\u7d20\u5c5e\u6027:<\/p>\n<p> <span class=\"token operator\">&lt;<\/span>img src<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;rose.jpg&#034;<\/span> alt<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;\u8fd9\u662f\u4e00\u6735\u82b1&#034;<\/span> title<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;\u73ab\u7470\u82b1&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>script<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token keyword\">var<\/span> img <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;img&#039;<\/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>img<span class=\"token punctuation\">.<\/span>src<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u83b7\u53d6\u56fe\u7247\u7684src\u5c5e\u6027\u503c<\/span><br \/>\n  console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>img<span class=\"token punctuation\">.<\/span>title<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u83b7\u53d6\u56fe\u7247\u7684title\u5c5e\u6027\u503c<\/span><br \/>\n  console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>img<span class=\"token punctuation\">.<\/span>alt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u83b7\u53d6\u56fe\u7247\u7684alt\u5c5e\u6027\u503c<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>script<span class=\"token operator\">&gt;<\/span><\/p>\n<p><span class=\"token operator\">&lt;<\/span>img src<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;rose.jpg&#034;<\/span> alt<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;\u8fd9\u662f\u4e00\u6735\u82b1&#034;<\/span> title<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;\u73ab\u7470\u82b1&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>script<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token keyword\">var<\/span> img <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;img&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u7ed9\u56fe\u7247\u7ed1\u5b9a\u70b9\u51fb\u4e8b\u4ef6&#xff0c;\u5b9e\u73b0\u56fe\u7247\u5207\u6362<\/span><br \/>\n  img<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onclick<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/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>img<span class=\"token punctuation\">.<\/span>src<span class=\"token punctuation\">.<\/span><span class=\"token function\">lastIndexOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;rose.jpg&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#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 comment\">\/\/ \u5f53\u524d\u662frose.jpg\u65f6&#xff0c;\u5207\u6362\u4e3arose2.png<\/span><br \/>\n      img<span class=\"token punctuation\">.<\/span>src <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;.\/rose2.png&#039;<\/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 comment\">\/\/ \u5426\u5219\u5207\u6362\u56derose.jpg<\/span><br \/>\n      img<span class=\"token punctuation\">.<\/span>src <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;.\/rose.jpg&#039;<\/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 operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>script<span class=\"token operator\">&gt;<\/span><\/p>\n<p>\u83b7\u53d6\/\u4fee\u6539\u8868\u5355\u5143\u7d20\u5c5e\u6027:<\/p>\n<p>\u8868\u5355&#xff08;\u4e3b\u8981\u662f&lt;input&gt;\u6807\u7b7e&#xff09;\u7684\u4ee5\u4e0b\u5c5e\u6027&#xff0c;\u90fd\u53ef\u4ee5\u901a\u8fc7 DOM \u8fdb\u884c\u8bfb\u5199\u4fee\u6539&#xff1a;<\/p>\n<p>value&#xff1a;input \u7684\u5185\u5bb9\u503c&#xff08;\u5982\u6587\u672c\u6846\u3001\u6309\u94ae\u7684\u663e\u793a\u6587\u672c&#xff09;<\/p>\n<p>disabled&#xff1a;\u662f\u5426\u7981\u7528\u8868\u5355\u5143\u7d20&#xff08;\u5e03\u5c14\u503c&#xff0c;true\u4e3a\u7981\u7528&#xff0c;false\u4e3a\u542f\u7528&#xff09;<\/p>\n<p>checked&#xff1a;\u590d\u9009\u6846 \/ \u5355\u9009\u6846\u662f\u5426\u88ab\u9009\u4e2d&#xff08;\u5e03\u5c14\u503c&#xff09;<\/p>\n<p>selected&#xff1a;\u4e0b\u62c9\u6846&lt;option&gt;\u662f\u5426\u88ab\u9009\u4e2d&#xff08;\u5e03\u5c14\u503c&#xff09;<\/p>\n<p>type&#xff1a;input \u7684\u7c7b\u578b&#xff08;\u5982text\u3001password\u3001button\u3001file\u7b49&#xff09;<\/p>\n<p> <span class=\"token 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