{"id":1425,"date":"2025-02-08T00:40:06","date_gmt":"2025-02-07T16:40:06","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=1425"},"modified":"2025-02-08T00:40:07","modified_gmt":"2025-02-07T16:40:07","slug":"%e6%b7%b1%e5%85%a5%e6%8e%a2%e8%ae%a8javascript%e5%bc%80%e5%8f%91%e4%b8%ad%e5%b8%b8%e8%a7%81%e7%9a%84%e9%94%99%e8%af%af%e4%b8%8e%e4%bc%98%e5%8c%96%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/02\/08\/%e6%b7%b1%e5%85%a5%e6%8e%a2%e8%ae%a8javascript%e5%bc%80%e5%8f%91%e4%b8%ad%e5%b8%b8%e8%a7%81%e7%9a%84%e9%94%99%e8%af%af%e4%b8%8e%e4%bc%98%e5%8c%96%e6%8a%80%e5%b7%a7\/","title":{"rendered":"\u6df1\u5165\u63a2\u8ba8JavaScript\u5f00\u53d1\u4e2d\u5e38\u89c1\u7684\u9519\u8bef\u4e0e\u4f18\u5316\u6280\u5de7"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5728JavaScript\u5f00\u53d1\u4e2d\uff0c\u9519\u8bef\u662f\u4e0d\u53ef\u907f\u514d\u7684\uff0c\u6df1\u5165\u7406\u89e3\u8fd9\u4e9b\u5e38\u89c1\u9519\u8bef\u4ee5\u53ca\u5b83\u4eec\u7684\u6839\u672c\u539f\u56e0\uff0c\u6709\u52a9\u4e8e\u907f\u514d\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d\u9047\u5230\u7684\u5e38\u89c1\u95ee\u9898\uff0c\u540c\u65f6\u4f7f\u5f97\u4ee3\u7801\u66f4\u52a0\u5065\u58ee\u548c\u53ef\u7ef4\u62a4\u3002\u7279\u522b\u662f\u4e00\u4e9b\u66f4\u590d\u6742\u7684\u6216\u5bb9\u6613\u5ffd\u89c6\u7684\u95ee\u9898\uff0c\u8fd9\u6837\u53ef\u4ee5\u5e2e\u52a9\u4f60\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u907f\u514d\u66f4\u591a\u6f5c\u5728\u7684\u9677\u9631\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>\u53d8\u91cf\u63d0\u5347\uff08Hoisting\uff09<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728JavaScript\u4e2d\uff0c\u53d8\u91cf\u63d0\u5347\uff08Hoisting\uff09\u662f\u6307<code>var<\/code>\u58f0\u660e\u7684\u53d8\u91cf\u4f1a\u88ab\u63d0\u5347\u5230\u51fd\u6570\u6216\u5168\u5c40\u4f5c\u7528\u57df\u7684\u9876\u90e8\uff0c\u800c<code>let<\/code>\u548c<code>const<\/code>\u58f0\u660e\u5219\u4e0d\u4f1a\u3002\u8fd9\u79cd\u884c\u4e3a\u53ef\u80fd\u5bfc\u81f4\u4e0d\u53ef\u9884\u671f\u7684\u9519\u8bef\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>var<\/code>\u58f0\u660e\u7684\u53d8\u91cf\u4f1a\u5148\u4e8e\u4ee3\u7801\u6267\u884c\u65f6\u88ab\u201c\u63d0\u5347\u201d\uff0c\u4f46\u8d4b\u503c\u4e0d\u4f1a\u3002<\/li>\n\n\n\n<li>\u7531\u4e8e<code>let<\/code>\u548c<code>const<\/code>\u4e0d\u4f1a\u88ab\u63d0\u5347\u5230\u4ee3\u7801\u9876\u90e8\uff0c\u5b83\u4eec\u4f1a\u5728\u58f0\u660e\u4e4b\u524d\u5904\u4e8e\u201c\u6682\u65f6\u6027\u6b7b\u533a\u201d\uff08TDZ\uff09\uff0c\u5373\u5982\u679c\u4f60\u5728\u58f0\u660e\u4e4b\u524d\u8bbf\u95ee\u5b83\u4eec\uff0c\u4f1a\u629b\u51fa<code>ReferenceError<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f7f\u7528 <code>let<\/code> \u548c <code>const<\/code> \u66ff\u4ee3 <code>var<\/code><\/strong>\uff1a\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u6f5c\u5728\u7684\u53d8\u91cf\u63d0\u5347\u95ee\u9898\u3002<\/li>\n\n\n\n<li><strong>\u6ce8\u610f<code>let<\/code>\u548c<code>const<\/code>\u7684TDZ<\/strong>\uff1a\u5728\u58f0\u660e\u4e4b\u524d\u8bbf\u95ee\u8fd9\u4e9b\u53d8\u91cf\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>console.log(a); \/\/ ReferenceError: Cannot access 'a' before initialization\nlet a = 5;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong><code>this<\/code>\u6307\u5411\u95ee\u9898<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728JavaScript\u4e2d\uff0c<code>this<\/code>\u7684\u503c\u662f\u7531\u51fd\u6570\u7684\u8c03\u7528\u65b9\u5f0f\u51b3\u5b9a\u7684\u3002\u5728\u4e0d\u540c\u7684\u4e0a\u4e0b\u6587\u4e2d\uff0c<code>this<\/code>\u53ef\u80fd\u4f1a\u6307\u5411\u4e0d\u540c\u7684\u5bf9\u8c61\uff0c\u5bfc\u81f4\u610f\u5916\u884c\u4e3a\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u51fd\u6570\u8c03\u7528<\/strong>\uff1a\u5728\u666e\u901a\u51fd\u6570\u8c03\u7528\u4e2d\uff0c<code>this<\/code>\u6307\u5411\u5168\u5c40\u5bf9\u8c61\uff08\u6d4f\u89c8\u5668\u4e2d\u662f<code>window<\/code>\uff0c\u4e25\u683c\u6a21\u5f0f\u4e0b\u662f<code>undefined<\/code>\uff09\u3002<\/li>\n\n\n\n<li><strong>\u4e8b\u4ef6\u76d1\u542c\u5668<\/strong>\uff1a\u5728\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e2d\uff0c<code>this<\/code>\u901a\u5e38\u6307\u5411\u89e6\u53d1\u4e8b\u4ef6\u7684DOM\u5143\u7d20\uff0c\u800c\u4e0d\u662f\u5f53\u524d\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li><strong>\u7bad\u5934\u51fd\u6570<\/strong>\uff1a\u7bad\u5934\u51fd\u6570\u4e0d\u4f1a\u7ed1\u5b9a\u81ea\u5df1\u7684<code>this<\/code>\uff0c\u5b83\u4f1a\u7ee7\u627f\u5916\u5c42\u51fd\u6570\u7684<code>this<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u663e\u5f0f\u7ed1\u5b9a <code>this<\/code><\/strong>\uff1a\u4f7f\u7528<code>.bind()<\/code>\u65b9\u6cd5\u6216<code>arrow functions<\/code>\u6765\u786e\u4fdd<code>this<\/code>\u6307\u5411\u6b63\u786e\u7684\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>function Counter() {\n  this.count = 0;\n  setInterval(function() {\n    console.log(this.count); \/\/ `this`\u6307\u5411`window`\uff0c\u4e0d\u662fCounter\u5b9e\u4f8b\n    this.count++;\n  }, 1000);\n}\nnew Counter();<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u901a\u8fc7<code>bind<\/code>\u89e3\u51b3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function Counter() {\n  this.count = 0;\n  setInterval(function() {\n    console.log(this.count);\n    this.count++;\n  }.bind(this), 1000);\n}\nnew Counter();<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6216\u8005\u4f7f\u7528\u7bad\u5934\u51fd\u6570\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function Counter() {\n  this.count = 0;\n  setInterval(() =&gt; {\n    console.log(this.count);\n    this.count++;\n  }, 1000);\n}\nnew Counter();<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>\u5f02\u6b65\u7f16\u7a0b\uff1a\u56de\u8c03\u5730\u72f1\uff08Callback Hell\uff09\u4e0ePromise<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f02\u6b65\u7f16\u7a0b\u662fJavaScript\u4e2d\u4e0d\u53ef\u907f\u514d\u7684\u90e8\u5206\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406I\/O\u64cd\u4f5c\u3001\u7f51\u7edc\u8bf7\u6c42\u7b49\u65f6\u3002\u6700\u521d\u4f7f\u7528\u56de\u8c03\u51fd\u6570\u6765\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\uff0c\u5bb9\u6613\u9677\u5165\u56de\u8c03\u5730\u72f1\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f53\u4f60\u6709\u591a\u4e2a\u5f02\u6b65\u64cd\u4f5c\u9700\u8981\u4f9d\u8d56\u65f6\uff0c\u6bcf\u4e2a\u56de\u8c03\u51fd\u6570\u5d4c\u5957\u5728\u53e6\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u5185\u90e8\uff0c\u5bfc\u81f4\u4ee3\u7801\u5c42\u5c42\u5d4c\u5957\uff0c\u96be\u4ee5\u7ef4\u62a4\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Promise<\/strong>\uff1a\u5f15\u5165<code>Promise<\/code>\uff0c\u4f7f\u5f97\u5f02\u6b65\u64cd\u4f5c\u80fd\u591f\u94fe\u5f0f\u8c03\u7528\uff0c\u907f\u514d\u5d4c\u5957\u7ed3\u6784\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>fetch('\/api\/data')\n  .then(response =&gt; response.json())\n  .then(data =&gt; {\n    console.log(data);\n  })\n  .catch(error =&gt; console.error(error));<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>async\/await<\/strong>\uff1a<code>async\/await<\/code>\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u7b80\u6d01\u7684\u65b9\u5f0f\u6765\u5904\u7406\u5f02\u6b65\u4ee3\u7801\uff0c\u4ee3\u7801\u7ed3\u6784\u66f4\u63a5\u8fd1\u540c\u6b65\u4ee3\u7801\uff0c\u63d0\u9ad8\u4e86\u53ef\u8bfb\u6027\u548c\u7ef4\u62a4\u6027\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>async function fetchData() {\n  try {\n    const response = await fetch('\/api\/data');\n    const data = await response.json();\n    console.log(data);\n  } catch (error) {\n    console.error(error);\n  }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong>\u95ed\u5305\u4e0e\u4f5c\u7528\u57df\u95ee\u9898<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u95ed\u5305\u662fJavaScript\u7684\u5f3a\u5927\u7279\u6027\uff0c\u4f46\u5b83\u4e5f\u5e38\u5e38\u5f15\u8d77\u4f5c\u7528\u57df\u7684\u95ee\u9898\uff0c\u5c24\u5176\u662f\u5f53\u95ed\u5305\u4e0e\u5f02\u6b65\u4ee3\u7801\u6216\u5faa\u73af\u7ed3\u5408\u65f6\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u95ed\u5305\u6355\u83b7\u7684\u5916\u90e8\u53d8\u91cf<\/strong>\uff1a\u5728\u5faa\u73af\u4e2d\u4f7f\u7528<code>var<\/code>\u58f0\u660e\u7684\u53d8\u91cf\u65f6\uff0c\u95ed\u5305\u4f1a\u5171\u4eab\u540c\u4e00\u4e2a\u53d8\u91cf\uff0c\u56e0\u6b64\u6240\u6709\u7684\u5f02\u6b65\u56de\u8c03\u90fd\u80fd\u8bbf\u95ee\u5230\u8fd9\u4e2a\u53d8\u91cf\u7684\u6700\u7ec8\u503c\u3002<\/li>\n\n\n\n<li>\u901a\u8fc7<code>let<\/code>\u6216<code>const<\/code>\u6765\u58f0\u660e\u5faa\u73af\u4e2d\u7684\u53d8\u91cf\uff0c\u6bcf\u6b21\u8fed\u4ee3\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u4f5c\u7528\u57df\uff0c\u4ece\u800c\u907f\u514d\u95ed\u5305\u7684\u95ee\u9898\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528<code>let<\/code>\u4ee3\u66ff<code>var<\/code>\u6765\u907f\u514d\u5171\u4eab\u540c\u4e00\u4e2a\u53d8\u91cf\u5f15\u7528\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>for (let i = 0; i &lt; 5; i++) {\n  setTimeout(() =&gt; {\n    console.log(i);  \/\/ \u8f93\u51fa0\u52304\n  }, 1000);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4f7f\u7528<code>var<\/code>\uff0c\u5219\u8f93\u51fa\u4f1a\u662f5\u6b21\u201c5\u201d\uff0c\u56e0\u4e3a<code>var<\/code>\u662f\u51fd\u6570\u4f5c\u7528\u57df\uff0c\u800c\u4e0d\u662f\u5757\u7ea7\u4f5c\u7528\u57df\uff0c\u5bfc\u81f4\u6bcf\u6b21\u8fed\u4ee3\u90fd\u5f15\u7528\u7684\u662f\u540c\u4e00\u4e2a<code>i<\/code>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. <strong>\u5185\u5b58\u6cc4\u6f0f<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5185\u5b58\u6cc4\u6f0f\u662f\u6307\u7a0b\u5e8f\u672a\u80fd\u53ca\u65f6\u91ca\u653e\u4e0d\u518d\u4f7f\u7528\u7684\u5185\u5b58\uff0c\u5bfc\u81f4\u7a0b\u5e8f\u5360\u7528\u8d8a\u6765\u8d8a\u591a\u7684\u5185\u5b58\uff0c\u6700\u7ec8\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u751a\u81f3\u5d29\u6e83\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u672a\u6e05\u7406\u7684\u4e8b\u4ef6\u76d1\u542c\u5668<\/strong>\uff1a\u5728\u9875\u9762\u9500\u6bc1\u6216\u4e0d\u518d\u9700\u8981\u4e8b\u4ef6\u76d1\u542c\u5668\u65f6\u672a\u79fb\u9664\u5b83\u4eec\u3002<\/li>\n\n\n\n<li><strong>\u5168\u5c40\u53d8\u91cf\u6ee5\u7528<\/strong>\uff1a\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u4e0d\u5fc5\u8981\u7684\u53d8\u91cf\u53ef\u80fd\u957f\u65f6\u95f4\u5360\u7528\u5185\u5b58\u3002<\/li>\n\n\n\n<li><strong>\u95ed\u5305\u5f15\u7528<\/strong>\uff1a\u95ed\u5305\u53ef\u80fd\u5f15\u7528\u5916\u90e8\u51fd\u6570\u7684\u53d8\u91cf\uff0c\u5373\u4f7f\u5916\u90e8\u51fd\u6570\u5df2\u7ecf\u8fd4\u56de\uff0c\u8fd9\u4e9b\u53d8\u91cf\u4e5f\u4e0d\u4f1a\u88ab\u5783\u573e\u56de\u6536\u5668\u6e05\u9664\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u79fb\u9664\u4e8b\u4ef6\u76d1\u542c\u5668<\/strong>\uff1a\u5728\u4e0d\u518d\u9700\u8981\u4e8b\u4ef6\u76d1\u542c\u5668\u65f6\uff0c\u4f7f\u7528<code>removeEventListener<\/code>\u79fb\u9664\u5b83\u4eec\u3002<\/li>\n\n\n\n<li><strong>\u907f\u514d\u5168\u5c40\u53d8\u91cf\u6c61\u67d3<\/strong>\uff1a\u5c3d\u91cf\u51cf\u5c11\u5168\u5c40\u53d8\u91cf\u7684\u4f7f\u7528\uff0c\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf\u3001\u6a21\u5757\u6216\u95ed\u5305\u6765\u5c01\u88c5\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u5783\u573e\u56de\u6536<\/strong>\uff1a\u867d\u7136JavaScript\u6709\u81ea\u52a8\u5783\u573e\u56de\u6536\u673a\u5236\uff0c\u4f46\u5f00\u53d1\u8005\u4ecd\u9700\u6ce8\u610f\u5f15\u7528\u7684\u6e05\u7406\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>const button = document.getElementById('myButton');\nfunction handleClick() {\n  console.log('Button clicked');\n}\n\nbutton.addEventListener('click', handleClick);\n\n\/\/ \u79fb\u9664\u4e8b\u4ef6\u76d1\u542c\u5668\nbutton.removeEventListener('click', handleClick);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">6. <strong>\u6570\u7ec4\u548c\u5bf9\u8c61\u7684\u6d45\u62f7\u8d1d<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u4f60\u590d\u5236\u4e00\u4e2a\u6570\u7ec4\u6216\u5bf9\u8c61\u65f6\uff0c\u5982\u679c\u53ea\u662f\u7b80\u5355\u5730\u8d4b\u503c\uff0c\u5b9e\u9645\u662f\u590d\u5236\u4e86\u5f15\u7528\uff0c\u800c\u975e\u6df1\u62f7\u8d1d\u3002\u8fd9\u53ef\u80fd\u5bfc\u81f4\u4e0d\u5e0c\u671b\u7684\u526f\u4f5c\u7528\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6d45\u62f7\u8d1d<\/strong>\uff1a\u5982\u679c\u62f7\u8d1d\u7684\u662f\u5f15\u7528\u7c7b\u578b\uff08\u6570\u7ec4\u3001\u5bf9\u8c61\u7b49\uff09\uff0c\u90a3\u4e48\u4fee\u6539\u4e00\u4e2a\u5bf9\u8c61\u7684\u5185\u5bb9\u4f1a\u5f71\u54cd\u5230\u53e6\u4e00\u4e2a\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528<code>Object.assign()<\/code>\u6216\u5c55\u5f00\u8fd0\u7b97\u7b26\uff08<code>...<\/code>\uff09\u8fdb\u884c\u6d45\u62f7\u8d1d\u3002<\/li>\n\n\n\n<li>\u5bf9\u4e8e\u5d4c\u5957\u5bf9\u8c61\uff0c\u4f7f\u7528\u6df1\u62f7\u8d1d\uff08\u4f8b\u5982<code>JSON.parse(JSON.stringify())<\/code>\uff09\u6765\u907f\u514d\u5f15\u7528\u5171\u4eab\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>let obj1 = { a: 1, b: { c: 2 } };\nlet obj2 = { ...obj1 }; \/\/ \u6d45\u62f7\u8d1d\nobj2.b.c = 3;\n\nconsole.log(obj1.b.c); \/\/ \u8f93\u51fa3\uff0cobj1\u4e5f\u53d7\u5f71\u54cd\n\n\/\/ \u6df1\u62f7\u8d1d\nlet obj3 = JSON.parse(JSON.stringify(obj1));\nobj3.b.c = 4;\nconsole.log(obj1.b.c); \/\/ \u8f93\u51fa2\uff0cobj1\u6ca1\u6709\u53d7\u5230\u5f71\u54cd<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">7. <strong>\u6570\u5b57\u548c\u7cbe\u5ea6\u95ee\u9898<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript\u4e2d\u7684<code>number<\/code>\u7c7b\u578b\u91c7\u7528\u7684\u662f\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u683c\u5f0f\uff0864-bit\uff09\uff0c\u8fd9\u610f\u5473\u7740\u67d0\u4e9b\u6570\u5b57\u65e0\u6cd5\u7cbe\u786e\u8868\u793a\uff0c\u7279\u522b\u662f\u5728\u8fdb\u884c\u5c0f\u6570\u8ba1\u7b97\u65f6\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u7cbe\u5ea6\u4e22\u5931\u95ee\u9898\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6d6e\u70b9\u6570\u7684\u8868\u793a\u95ee\u9898\uff1a\u4e00\u4e9b\u7b80\u5355\u7684\u6570\u5b66\u8fd0\u7b97\uff0c\u4f8b\u5982<code>0.1 + 0.2<\/code>\uff0c\u7ed3\u679c\u5e76\u4e0d\u4f1a\u7cbe\u786e\u7b49\u4e8e<code>0.3<\/code>\uff0c\u800c\u662f<code>0.30000000000000004<\/code>\u3002<\/li>\n\n\n\n<li>\u7531\u4e8e\u4e8c\u8fdb\u5236\u8868\u793a\u6cd5\u548c\u6d6e\u70b9\u6570\u5b58\u50a8\u673a\u5236\uff0c\u8fd9\u4e9b\u95ee\u9898\u5728\u5927\u90e8\u5206\u7f16\u7a0b\u8bed\u8a00\u4e2d\u90fd\u5b58\u5728\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u907f\u514d\u76f4\u63a5\u5bf9\u6d6e\u70b9\u6570\u8fdb\u884c\u7cbe\u786e\u6bd4\u8f83<\/strong>\uff0c\u800c\u662f\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2a\u5141\u8bb8\u7684\u8bef\u5dee\u8303\u56f4\u6765\u5224\u65ad\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>function isEqual(a, b) {\n  return Math.abs(a - b) &lt; Number.EPSILON;\n}\n\nconsole.log(isEqual(0.1 + 0.2, 0.3));  \/\/ true<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f7f\u7528\u6574\u6570\u6765\u5904\u7406\u5c0f\u6570<\/strong>\uff1a\u5982\u679c\u53ef\u80fd\uff0c\u53ef\u4ee5\u5c06\u5c0f\u6570\u8f6c\u6362\u4e3a\u6574\u6570\uff0c\u6267\u884c\u8ba1\u7b97\u540e\u518d\u8f6c\u6362\u56de\u5c0f\u6570\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>const result = (0.1 * 10 + 0.2 * 10) \/ 10;  \/\/ 0.3<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">8. <strong>\u7a7a\u503c\u548c\u201c\u5047\u503c\u201d\u5904\u7406<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728JavaScript\u4e2d\uff0c\u6709\u4e00\u4e9b\u88ab\u8ba4\u4e3a\u662f\u201c\u5047\u503c\u201d (<code>falsy values<\/code>)\uff0c\u5982<code>null<\/code>\u3001<code>undefined<\/code>\u3001<code>false<\/code>\u3001<code>0<\/code>\u3001<code>NaN<\/code>\u548c\u7a7a\u5b57\u7b26\u4e32<code>\"\"<\/code>\u3002\u8fd9\u4e9b\u503c\u5728\u903b\u8f91\u5224\u65ad\u4e2d\u7ecf\u5e38\u88ab\u8bef\u7528\uff0c\u5bfc\u81f4\u6f5c\u5728\u7684\u9519\u8bef\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u9690\u5f0f\u8f6c\u6362<\/strong>\uff1aJavaScript\u4f1a\u5728\u6761\u4ef6\u5224\u65ad\u4e2d\u81ea\u52a8\u5c06\u67d0\u4e9b\u7c7b\u578b\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\uff08<code>false<\/code>\u6216<code>true<\/code>\uff09\uff0c\u53ef\u80fd\u5bfc\u81f4\u7a0b\u5e8f\u903b\u8f91\u51fa\u73b0\u4e0d\u7b26\u5408\u9884\u671f\u7684\u7ed3\u679c\u3002<\/li>\n\n\n\n<li><strong><code>null<\/code>\u548c<code>undefined<\/code>\u7684\u533a\u522b<\/strong>\uff1a<code>null<\/code>\u8868\u793a\u6ca1\u6709\u503c\uff0c\u800c<code>undefined<\/code>\u8868\u793a\u53d8\u91cf\u672a\u521d\u59cb\u5316\uff0c\u4e8c\u8005\u7684\u4f7f\u7528\u4e0d\u5f53\u4e5f\u53ef\u80fd\u4f1a\u5f15\u53d1\u9519\u8bef\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528<code>===<\/code>\u8fdb\u884c\u4e25\u683c\u6bd4\u8f83\uff0c\u907f\u514d\u53d1\u751f\u7c7b\u578b\u8f6c\u6362\u3002<\/li>\n\n\n\n<li>\u5bf9\u53ef\u80fd\u4e3a<code>null<\/code>\u6216<code>undefined<\/code>\u7684\u53d8\u91cf\u8fdb\u884c\u663e\u5f0f\u68c0\u67e5\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>let value = null;\n\nif (value === null) {\n  console.log(\"Value is null\");\n} else if (value === undefined) {\n  console.log(\"Value is undefined\");\n} else {\n  console.log(\"Value is neither null nor undefined\");\n}<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26\u65f6\u7684\u77ed\u8def\u673a\u5236<\/strong>\uff1a\u7406\u89e3<code>&amp;&amp;<\/code>\uff08\u4e0e\uff09\u548c<code>||<\/code>\uff08\u6216\uff09\u8fd0\u7b97\u7b26\u7684\u77ed\u8def\u884c\u4e3a\uff0c\u907f\u514d\u610f\u5916\u5730\u5c06\u201c\u5047\u503c\u201d\u5f53\u4f5c\u6709\u6548\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>let a = null;\nlet b = \"Hello\";\n\nconsole.log(a || b);  \/\/ \"Hello\"\uff08\u77ed\u8def\u8fd0\u7b97\uff0ca\u4e3anull\u65f6b\u53d6\u503c\uff09\nconsole.log(a &amp;&amp; b);  \/\/ null\uff08a\u4e3anull\u65f6b\u4e0d\u518d\u8ba1\u7b97\uff09<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">9. <strong>\u6a21\u5757\u5316\u4e0e\u4f9d\u8d56\u7ba1\u7406\u95ee\u9898<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u968f\u7740JavaScript\u5e94\u7528\u53d8\u5f97\u8d8a\u6765\u8d8a\u590d\u6742\uff0c\u6a21\u5757\u5316\u53d8\u5f97\u975e\u5e38\u91cd\u8981\u3002\u5728\u6a21\u5757\u5316\u5f00\u53d1\u4e2d\uff0c\u4e0d\u5f53\u7684\u4f9d\u8d56\u7ba1\u7406\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4ee3\u7801\u53d8\u5f97\u96be\u4ee5\u7ef4\u62a4\uff0c\u751a\u81f3\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5faa\u73af\u4f9d\u8d56<\/strong>\uff1a\u6a21\u5757\u4e4b\u95f4\u76f8\u4e92\u4f9d\u8d56\uff0c\u5f62\u6210\u5faa\u73af\u5f15\u7528\uff0c\u5bfc\u81f4\u65e0\u6cd5\u6b63\u5e38\u52a0\u8f7d\u548c\u6267\u884c\u3002<\/li>\n\n\n\n<li><strong>\u547d\u540d\u51b2\u7a81<\/strong>\uff1a\u5728\u6ca1\u6709\u9002\u5f53\u547d\u540d\u7a7a\u95f4\u7684\u60c5\u51b5\u4e0b\uff0c\u591a\u4e2a\u6a21\u5757\u53ef\u80fd\u4f1a\u51fa\u73b0\u547d\u540d\u51b2\u7a81\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f7f\u7528\u6a21\u5757\u5316\u5de5\u5177<\/strong>\uff08\u5982<code>Webpack<\/code>\u3001<code>Rollup<\/code>\u3001<code>ES6\u6a21\u5757<\/code>\u7b49\uff09\u6765\u7ba1\u7406\u4f9d\u8d56\uff0c\u907f\u514d\u624b\u52a8\u7ba1\u7406\u4f9d\u8d56\u3002<\/li>\n\n\n\n<li><strong>\u907f\u514d\u5faa\u73af\u4f9d\u8d56<\/strong>\uff1a\u5c3d\u91cf\u5c06\u6a21\u5757\u8bbe\u8ba1\u6210\u72ec\u7acb\u4e14\u5c3d\u53ef\u80fd\u5c11\u4f9d\u8d56\u5176\u4ed6\u6a21\u5757\u3002<\/li>\n\n\n\n<li><strong>\u547d\u540d\u7a7a\u95f4\u7ba1\u7406<\/strong>\uff1a\u4f7f\u7528\u547d\u540d\u7a7a\u95f4\u6765\u907f\u514d\u6a21\u5757\u4e4b\u95f4\u7684\u547d\u540d\u51b2\u7a81\u3002\u53ef\u4ee5\u4f7f\u7528<code>ES6<\/code>\u7684<code>import\/export<\/code>\u6216<code>CommonJS<\/code>\u7684<code>require<\/code>\u6765\u5b9e\u73b0\u6a21\u5757\u95f4\u7684\u4f9d\u8d56\u7ba1\u7406\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">10. <strong>CSS\u548cJavaScript\u7684\u4ea4\u4e92\u95ee\u9898<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u524d\u7aef\u5f00\u53d1\u4e2d\uff0cCSS\u548cJavaScript\u7ecf\u5e38\u9700\u8981\u7d27\u5bc6\u914d\u5408\uff0c\u9519\u8bef\u7684\u4ea4\u4e92\u53ef\u80fd\u5bfc\u81f4\u754c\u9762\u5c55\u793a\u95ee\u9898\u6216\u5f71\u54cd\u6027\u80fd\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6837\u5f0f\u7ade\u4e89<\/strong>\uff1aCSS\u548cJavaScript\u64cd\u4f5c\u540c\u4e00\u4e2a\u5143\u7d20\u65f6\uff0c\u53ef\u80fd\u53d1\u751f\u7ade\u4e89\uff0c\u5bfc\u81f4\u6837\u5f0f\u548c\u884c\u4e3a\u4e0d\u4e00\u81f4\u3002<\/li>\n\n\n\n<li><strong>\u91cd\u6392\u548c\u91cd\u7ed8<\/strong>\uff1a\u9891\u7e41\u7684DOM\u64cd\u4f5c\u4f1a\u5f15\u8d77\u9875\u9762\u7684\u91cd\u6392\uff08reflow\uff09\u548c\u91cd\u7ed8\uff08repaint\uff09\uff0c\u8fd9\u4f1a\u5f71\u54cd\u6027\u80fd\u3002<\/li>\n\n\n\n<li><strong>\u5f02\u6b65\u66f4\u65b0UI<\/strong>\uff1a\u5728\u9ad8\u9891\u7387\u7684UI\u66f4\u65b0\u4e2d\uff0c\u5f02\u6b65\u64cd\u4f5c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u66f4\u65b0\u4e0d\u7a33\u5b9a\u6216\u95ea\u70c1\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u51cf\u5c11\u9891\u7e41\u7684DOM\u64cd\u4f5c<\/strong>\uff1a\u901a\u8fc7\u6279\u91cf\u66f4\u65b0\u3001\u5408\u5e76\u64cd\u4f5c\u6765\u907f\u514d\u6bcf\u6b21\u64cd\u4f5c\u90fd\u5bfc\u81f4\u6d4f\u89c8\u5668\u91cd\u6392\u3002<\/li>\n\n\n\n<li><strong>\u4f7f\u7528<code>requestAnimationFrame<\/code><\/strong>\uff1a\u901a\u8fc7<code>requestAnimationFrame<\/code>\u6765\u4f18\u5316\u52a8\u753b\u6548\u679c\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u91cd\u7ed8\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>function animate() {\n  \/\/ \u6267\u884c\u52a8\u753b\n  requestAnimationFrame(animate);  \/\/ \u4e0b\u6b21\u6d4f\u89c8\u5668\u6e32\u67d3\u65f6\u8c03\u7528\u8be5\u51fd\u6570\n}\n\nrequestAnimationFrame(animate);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f7f\u7528CSS\u52a8\u753b\u4e0e\u8fc7\u6e21<\/strong>\uff1a\u5c3d\u91cf\u901a\u8fc7CSS\u6765\u5b9e\u73b0\u52a8\u753b\uff0c\u800c\u975e\u901a\u8fc7JavaScript\uff0c\u56e0\u4e3aCSS\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u5229\u7528\u6d4f\u89c8\u5668\u7684\u6e32\u67d3\u4f18\u5316\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">11. <strong>\u8de8\u6d4f\u89c8\u5668\u517c\u5bb9\u6027\u95ee\u9898<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c3d\u7ba1\u73b0\u4ee3\u6d4f\u89c8\u5668\u8d8a\u6765\u8d8a\u7edf\u4e00\uff0c\u4f46\u4ecd\u7136\u5b58\u5728\u4e00\u4e9b\u7279\u6027\u4e0d\u517c\u5bb9\u7684\u95ee\u9898\uff0c\u5c24\u5176\u662f\u5728\u8001\u7248\u672c\u6d4f\u89c8\u5668\u548c\u4e0d\u540c\u5f15\u64ce\u4e4b\u95f4\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CSS\u4e0eHTML\u4e0d\u517c\u5bb9<\/strong>\uff1a\u4e0d\u540c\u6d4f\u89c8\u5668\u5bf9\u67d0\u4e9bCSS\u5c5e\u6027\uff08\u5982Flexbox\u3001Grid\u7b49\uff09\u7684\u652f\u6301\u4e0d\u540c\uff0c\u5c24\u5176\u662f\u65e7\u7248\u6d4f\u89c8\u5668\u3002<\/li>\n\n\n\n<li><strong>JavaScript\u7279\u6027<\/strong>\uff1a\u65b0\u7279\u6027\uff08\u5982<code>async\/await<\/code>\u3001<code>fetch<\/code>\uff09\u5728\u65e7\u6d4f\u89c8\u5668\u4e0a\u5e76\u4e0d\u652f\u6301\uff0c\u53ef\u80fd\u5bfc\u81f4\u529f\u80fd\u65e0\u6cd5\u6b63\u5e38\u5de5\u4f5c\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f7f\u7528Polyfill<\/strong>\uff1a\u4e3a\u4e0d\u652f\u6301\u7684\u7279\u6027\u6dfb\u52a0\u8865\u4e01\uff0c\u4f8b\u5982\u4f7f\u7528<code>Babel<\/code>\u8f6c\u8bd1ES6\u8bed\u6cd5\u6216\u4f7f\u7528<code>core-js<\/code>\u5e93\u3002<\/li>\n\n\n\n<li><strong>CSS\u524d\u7f00<\/strong>\uff1a\u5bf9\u4e8e\u4e00\u4e9bCSS\u7279\u6027\uff0c\u53ef\u4ee5\u4f7f\u7528\u6d4f\u89c8\u5668\u524d\u7f00\u6765\u589e\u52a0\u517c\u5bb9\u6027\uff0c\u5982<code>-webkit-<\/code>\u3001<code>-moz-<\/code>\u7b49\u3002<\/li>\n\n\n\n<li><strong>\u73b0\u4ee3JavaScript\u6846\u67b6<\/strong>\uff1a\u4f7f\u7528React\u3001Vue\u3001Angular\u7b49\u6846\u67b6\uff0c\u5b83\u4eec\u901a\u5e38\u5df2\u7ecf\u89e3\u51b3\u4e86\u5f88\u591a\u8de8\u6d4f\u89c8\u5668\u517c\u5bb9\u6027\u7684\u95ee\u9898\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">12. <strong>\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u8bef\u7528<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u4f46\u4e0d\u719f\u6089\u5b83\u7684\u5f00\u53d1\u8005\u53ef\u80fd\u4f1a\u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u4f7f\u7528\u4e2d\u51fa\u9519\uff0c\u5bfc\u81f4\u5339\u914d\u5931\u8d25\u6216\u6027\u80fd\u95ee\u9898\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u95ee\u9898\u6839\u6e90\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u65e0\u7a77\u5faa\u73af\u95ee\u9898<\/strong>\uff1a\u4e0d\u6b63\u786e\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u53ef\u80fd\u5bfc\u81f4\u65e0\u9650\u5faa\u73af\uff0c\u7279\u522b\u662f\u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528\u4e86\u56de\u6eaf\uff08backtracking\uff09\u6a21\u5f0f\u3002<\/li>\n\n\n\n<li><strong>\u6027\u80fd\u95ee\u9898<\/strong>\uff1a\u5bf9\u4e8e\u5927\u578b\u6587\u672c\u548c\u590d\u6742\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u74f6\u9888\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6848\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u907f\u514d\u590d\u6742\u7684\u6b63\u5219\u8868\u8fbe\u5f0f<\/strong>\uff1a\u5c3d\u91cf\u7b80\u5316\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u907f\u514d\u4f7f\u7528\u590d\u6742\u7684\u56de\u6eaf\u6a21\u5f0f\uff0c\u5c24\u5176\u662f\u5728\u957f\u6587\u672c\u4e2d\u3002<\/li>\n\n\n\n<li><strong>\u8c03\u8bd5\u6b63\u5219\u8868\u8fbe\u5f0f<\/strong>\uff1a\u4f7f\u7528\u5728\u7ebf\u5de5\u5177\uff08\u5982<a href=\"https:\/\/regex101.com\/\">regex101<\/a>\uff09\u6765\u6d4b\u8bd5\u548c\u4f18\u5316\u6b63\u5219\u8868\u8fbe\u5f0f\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>const regex = \/a+\/g; \/\/ \u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\nconst str = \"aaaaaaaaaaaaaaaaaaaaaaab\";\nconsole.log(str.match(regex)); \/\/ &#91; 'aaaaaaaaaaaaaaaaaaaaaa' ] \u53ef\u80fd\u5f15\u8d77\u6027\u80fd\u95ee\u9898<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u8fd9\u4e9b\u6df1\u5165\u7684\u8ba8\u8bba\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230JavaScript\u4e2d\u5e38\u89c1\u7684\u9677\u9631\u4e0d\u4ec5\u4ec5\u662f\u57fa\u7840\u7684\u8bed\u6cd5\u95ee\u9898\uff0c\u8fd8\u6d89\u53ca\u5230\u6027\u80fd\u4f18\u5316\u3001\u5f02\u6b65\u7f16\u7a0b\u3001\u6a21\u5757\u5316\u7b49\u9ad8\u7ea7\u6982\u5ff5\u3002\u7406\u89e3\u548c\u907f\u514d\u8fd9\u4e9b\u95ee\u9898\u5c06\u4f7f\u5f00\u53d1\u8005\u80fd\u591f\u7f16\u5199\u66f4\u52a0\u5065\u58ee\u548c\u9ad8\u6548\u7684\u4ee3\u7801\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728JavaScript\u5f00\u53d1\u4e2d\uff0c\u9519\u8bef\u662f\u4e0d\u53ef\u907f\u514d\u7684\uff0c\u6df1\u5165\u7406\u89e3\u8fd9\u4e9b\u5e38\u89c1\u9519\u8bef\u4ee5\u53ca\u5b83\u4eec\u7684\u6839\u672c\u539f\u56e0\uff0c\u6709\u52a9\u4e8e\u907f\u514d\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[],"class_list":["post-1425","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1425","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=1425"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1425\/revisions"}],"predecessor-version":[{"id":1426,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1425\/revisions\/1426"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=1425"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=1425"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=1425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}