{"id":103028,"date":"2026-09-09T19:17:21","date_gmt":"2026-09-09T11:17:21","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/103028.html"},"modified":"2026-09-09T19:17:21","modified_gmt":"2026-09-09T11:17:21","slug":"javascript%e5%9f%ba%e7%a1%80%e4%bd%93%e7%b3%bb%ef%bd%9c%e5%89%8d%e7%ab%af%e4%ba%a4%e4%ba%92%e8%af%ad%e8%a8%80%e6%a0%b8%e5%bf%83%e5%85%a5%e9%97%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/103028.html","title":{"rendered":"JavaScript\u57fa\u7840\u4f53\u7cfb\uff5c\u524d\u7aef\u4ea4\u4e92\u8bed\u8a00\u6838\u5fc3\u5165\u95e8"},"content":{"rendered":"<p>HTML\u642d\u5efa\u9875\u9762\u7ed3\u6784&#xff0c;CSS\u8d1f\u8d23\u89c6\u89c9\u6e32\u67d3&#xff0c;\u800cJavaScript\u8d4b\u4e88\u7f51\u9875\u52a8\u6001\u4ea4\u4e92\u80fd\u529b\u3002\u4e09\u8005\u5171\u540c\u6784\u6210\u524d\u7aef\u9875\u9762\u7684\u94c1\u4e09\u89d2\u3002<\/p>\n<p>\u5f88\u591a\u521d\u5b66\u8005\u8bef\u4ee5\u4e3aJS\u53ea\u662f\u7b80\u5355\u7684\u70b9\u51fb\u5f39\u7a97\u3001\u4fee\u6539\u6587\u5b57\u3002\u5b9e\u9645\u4e0a\u5b83\u662f\u4e00\u95e8\u5b8c\u6574\u7684\u89e3\u91ca\u578b\u7f16\u7a0b\u8bed\u8a00&#xff0c;\u62e5\u6709\u53d8\u91cf\u3001\u7c7b\u578b\u3001\u5206\u652f\u3001\u5faa\u73af\u3001\u51fd\u6570\u7b49\u6574\u5957\u7f16\u7a0b\u4f53\u7cfb\u3002\u65e2\u80fd\u5728\u6d4f\u89c8\u5668\u64cd\u4f5c\u9875\u9762DOM&#xff0c;\u4e5f\u53ef\u4ee5\u501f\u52a9Node.js\u5728\u670d\u52a1\u7aef\u8fd0\u884c\u3002<\/p>\n<p>\u672c\u6587\u5f00\u542fJS\u4e13\u680f\u7b2c\u4e00\u7bc7&#xff0c;\u7cfb\u7edf\u68b3\u7406JavaScript\u57fa\u7840\u6838\u5fc3\u4f53\u7cfb&#xff0c;\u5efa\u7acb\u5b8c\u6574\u7684\u8bed\u8a00\u8ba4\u77e5\u6846\u67b6\u3002<\/p>\n<hr \/>\n<h3>\u4e00\u3001JavaScript\u4e09\u5927\u7ec4\u6210\u90e8\u5206<\/h3>\n<p>\u5b8c\u6574JS\u7531\u4e09\u5757\u6a21\u5757\u6784\u6210&#xff0c;\u5206\u5de5\u8fb9\u754c\u6e05\u6670&#xff1a;<\/p>\n<ul>\n<li>\n<p>ECMAScript&#xff08;\u8bed\u8a00\u6838\u5fc3&#xff09;&#xff1a;JS\u8bed\u6cd5\u672c\u8eab&#xff0c;\u53d8\u91cf\u3001\u6570\u636e\u7c7b\u578b\u3001\u5faa\u73af\u3001\u51fd\u6570\u3001\u5bf9\u8c61\u7b49\u3002\u8131\u79bb\u6d4f\u89c8\u5668\u4f9d\u7136\u53ef\u4ee5\u8fd0\u884c&#xff0c;\u662fJS\u7684\u672c\u4f53\u3002<\/p>\n<\/li>\n<li>\n<p>DOM&#xff08;\u6587\u6863\u5bf9\u8c61\u6a21\u578b&#xff09;&#xff1a;\u64cd\u4f5cHTML\u9875\u9762\u5143\u7d20\u7684API\u3002\u53ef\u4ee5\u589e\u5220\u6807\u7b7e\u3001\u4fee\u6539\u5185\u5bb9\u3001\u6837\u5f0f&#xff0c;\u5b9e\u73b0\u9875\u9762\u53d8\u5316\u3002<\/p>\n<\/li>\n<li>\n<p>BOM&#xff08;\u6d4f\u89c8\u5668\u5bf9\u8c61\u6a21\u578b&#xff09;&#xff1a;\u64cd\u4f5c\u6d4f\u89c8\u5668\u7a97\u53e3&#xff0c;\u83b7\u53d6\u6d4f\u89c8\u5668\u4fe1\u606f\u3001\u5b9a\u65f6\u5668\u3001\u9875\u9762\u8df3\u8f6c\u3001\u672c\u5730\u5b58\u50a8\u7b49\u80fd\u529b\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u4e8c\u3001JS\u4ee3\u7801\u4e66\u5199\u4f4d\u7f6e<\/h3>\n<p>\u4e09\u79cd\u4e66\u5199\u4f4d\u7f6e&#xff0c;\u4e1a\u52a1\u5f00\u53d1\u4f18\u5148\u5916\u90e8js\u6587\u4ef6\u3002<\/p>\n<p>&lt;!&#8211; 1.\u884c\u5185JS&#xff08;\u6781\u5c11\u4f7f\u7528&#xff0c;\u4e0d\u5229\u4e8e\u7ed3\u6784\u4e0e\u4ee3\u7801\u5206\u79bb&#xff09; &#8211;&gt; &lt;!&#8211; 2.\u5185\u5d4cscript\u6807\u7b7e &#8211;&gt; &lt;!&#8211; 3.\u5916\u90e8JS\u6587\u4ef6&#xff0c;\u5f00\u53d1\u9996\u9009 &#8211;&gt; <\/p>\n<p>\u26a0\ufe0f script\u6807\u7b7e\u9ed8\u8ba4\u4f1a\u963b\u585e\u9875\u9762\u89e3\u6790&#xff0c;\u653e\u5728body\u5e95\u90e8\u53ef\u4ee5\u907f\u514d\u9875\u9762\u6e32\u67d3\u5361\u987f\u3002<\/p>\n<h3>\u4e09\u3001\u53d8\u91cf&#xff1a;\u5b58\u50a8\u6570\u636e\u7684\u5bb9\u5668<\/h3>\n<p>\u53d8\u91cf\u672c\u8d28\u662f\u5185\u5b58\u7a7a\u95f4\u7684\u522b\u540d&#xff0c;\u7528\u6765\u5b58\u653e\u5404\u7c7b\u6570\u636e\u3002JS\u6709\u4e09\u4e2a\u58f0\u660e\u5173\u952e\u5b57&#xff1a;var\u3001let\u3001const\u3002<\/p>\n<p>\/\/ const&#xff1a;\u5e38\u91cf&#xff0c;\u4e00\u65e6\u8d4b\u503c\u4e0d\u80fd\u4fee\u6539&#xff0c;\u63a8\u8350\u4f18\u5148\u4f7f\u7528 const username &#061; &#034;\u524d\u7aef\u5b66\u4e60&#034;; \/\/ let&#xff1a;\u53d8\u91cf&#xff0c;\u540e\u7eed\u503c\u53ef\u4ee5\u4fee\u6539&#xff0c;\u5757\u7ea7\u4f5c\u7528\u57df let age &#061; 20; \/\/ var&#xff1a;\u65e7\u65f6\u4ee3\u58f0\u660e\u65b9\u5f0f&#xff0c;\u5b58\u5728\u5f88\u591a\u7f3a\u9677&#xff0c;\u73b0\u4ee3\u9879\u76ee\u4e0d\u63a8\u8350\u4f7f\u7528 var gender &#061; &#034;\u7537&#034;; <\/p>\n<ul>\n<li>\n<p>const&#xff1a;\u58f0\u660e\u5e38\u91cf&#xff0c;\u5fc5\u987b\u521d\u59cb\u5316&#xff0c;\u4e0d\u80fd\u91cd\u65b0\u8d4b\u503c&#xff1b;\u5f15\u7528\u7c7b\u578b\u53ef\u4ee5\u4fee\u6539\u5185\u90e8\u5c5e\u6027<\/p>\n<\/li>\n<li>\n<p>let&#xff1a;\u53ef\u53d8\u53d8\u91cf&#xff0c;\u5757\u7ea7\u4f5c\u7528\u57df&#xff0c;\u4e0d\u80fd\u91cd\u590d\u58f0\u660e&#xff0c;\u5b58\u5728\u6682\u65f6\u6027\u6b7b\u533a<\/p>\n<\/li>\n<li>\n<p>var&#xff1a;\u51fd\u6570\u7ea7\u4f5c\u7528\u57df&#xff0c;\u5141\u8bb8\u91cd\u590d\u58f0\u660e&#xff0c;\u5b58\u5728\u53d8\u91cf\u63d0\u5347&#xff0c;\u5bb9\u6613\u5f15\u53d1bug<\/p>\n<\/li>\n<\/ul>\n<p>\u2705 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false<\/p>\n<\/li>\n<li>\n<p>undefined&#xff1a;\u672a\u5b9a\u4e49&#xff0c;\u53d8\u91cf\u58f0\u660e\u6ca1\u6709\u8d4b\u503c<\/p>\n<\/li>\n<li>\n<p>null&#xff1a;\u7a7a\u503c&#xff0c;\u4ee3\u8868\u4e0d\u5b58\u5728\u5bf9\u8c61<\/p>\n<\/li>\n<li>\n<p>symbol&#xff08;ES6&#xff09;&#xff1a;\u552f\u4e00\u6807\u8bc6<\/p>\n<\/li>\n<\/ul>\n<h4>\u5f15\u7528\u6570\u636e\u7c7b\u578b&#xff08;\u5730\u5740\u62f7\u8d1d&#xff09;<\/h4>\n<p>Object \u5bf9\u8c61\u3001Array \u6570\u7ec4\u3001Function \u51fd\u6570\u3002\u53d8\u91cf\u4fdd\u5b58\u7684\u662f\u5185\u5b58\u5730\u5740&#xff0c;\u591a\u4e2a\u53d8\u91cf\u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61\u65f6&#xff0c;\u4fee\u6539\u4f1a\u4e92\u76f8\u5f71\u54cd\u3002<\/p>\n<h3>\u4e94\u3001\u63a7\u5236\u53f0\u8f93\u51fa\u4e0e\u6ce8\u91ca<\/h3>\n<p>\/\/ \u5355\u884c\u6ce8\u91ca \/* \u591a\u884c\u6ce8\u91ca *\/ \/\/ \u63a7\u5236\u53f0\u6253\u5370&#xff0c;\u8c03\u8bd5\u6700\u5e38\u7528 console.log(&#039;\u6253\u5370\u5185\u5bb9&#039;); console.error(&#039;\u9519\u8bef\u4fe1\u606f&#039;); <\/p>\n<h3>\u516d\u3001\u6807\u8bc6\u7b26\u547d\u540d\u89c4\u8303<\/h3>\n<ul>\n<li>\n<p>\u53ea\u80fd\u7531\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\u3001$\u7ec4\u6210&#xff0c;\u4e0d\u80fd\u4ee5\u6570\u5b57\u5f00\u5934<\/p>\n<\/li>\n<li>\n<p>\u533a\u5206\u5927\u5c0f\u5199&#xff0c;Name \u548c name \u662f\u4e24\u4e2a\u53d8\u91cf<\/p>\n<\/li>\n<li>\n<p>\u4e0d\u80fd\u4f7f\u7528JS\u5173\u952e\u5b57&#xff1a;let\u3001const\u3001var\u3001function\u7b49<\/p>\n<\/li>\n<li>\n<p>\u63a8\u8350\u5c0f\u9a7c\u5cf0\u547d\u540d&#xff1a;userName\u3001userInfo<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e03\u3001\u57fa\u7840\u8fd0\u7b97\u7b26\u7b80\u8ff0<\/h3>\n<p>\/\/ \u7b97\u672f\u8fd0\u7b97\u7b26 &#043; &#8211; * \/ % &#043;&#043; &#8212; let a &#061; 10 &#043; 20; \/\/ \u8d4b\u503c\u8fd0\u7b97\u7b26 &#061; &#043;&#061; -&#061; *&#061; let num &#061; 1; num &#043;&#061; 5; \/\/ \u6bd4\u8f83\u8fd0\u7b97\u7b26 &gt; &lt; &gt;&#061; &lt;&#061; &#061;&#061; &#061;&#061;&#061; !&#061; !&#061;&#061; console.log(10 &#061;&#061;&#061; &#034;10&#034;); \/\/ false \u5168\u7b49&#xff0c;\u503c&#043;\u7c7b\u578b\u4e00\u8d77\u5224\u65ad \/\/ \u903b\u8f91\u8fd0\u7b97\u7b26 &amp;&amp; \u5e76\u4e14 || \u6216\u8005 !\u53d6\u53cd <\/p>\n<p>\u63a8\u8350\u4f7f\u7528&#061;&#061;&#061; \u5168\u7b49\u5224\u65ad&#xff0c;\u907f\u514d &#061;&#061; 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