{"id":168938,"date":"2024-05-08T16:34:51","date_gmt":"2024-05-08T08:34:51","guid":{"rendered":""},"modified":"2024-05-08T16:35:04","modified_gmt":"2024-05-08T08:35:04","slug":"javascript-%e6%96%87%e4%bb%b6%e7%9a%84%e5%90%8c%e6%ad%a5%e5%92%8c%e5%bc%82%e6%ad%a5%e5%8a%a0%e8%bd%bd%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/168938.html","title":{"rendered":"JavaScript \u6587\u4ef6\u7684\u540c\u6b65\u548c\u5f02\u6b65\u52a0\u8f7d\u5982\u4f55\u5b9e\u73b0"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27035258\/74c13e0b-8a9a-43e4-9d2a-ec778f2fd949.webp\" alt=\"JavaScript \u6587\u4ef6\u7684\u540c\u6b65\u548c\u5f02\u6b65\u52a0\u8f7d\u5982\u4f55\u5b9e\u73b0\" 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src=&quot;script2.js&quot;&gt;&lt;\/script&gt;<\/p>\n<p>&lt;\/body&gt;<\/p>\n<p>&lt;\/html&gt;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c<code>script1.js<\/code>\u548c<code>script2.js<\/code>\u5c06\u6309\u7167\u51fa\u73b0\u7684\u987a\u5e8f\u4f9d\u6b21\u540c\u6b65\u52a0\u8f7d\u3002\u5728<code>script1.js<\/code>\u52a0\u8f7d\u548c\u6267\u884c\u5b8c\u6bd5\u4e4b\u524d\uff0c\u9875\u9762\u7684\u6e32\u67d3\u5c06\u4e0d\u4f1a\u7ee7\u7eed\u3002\u540c\u6837\uff0c\u5728<code>script2.js<\/code>\u52a0\u8f7d\u548c\u6267\u884c\u5b8c\u6bd5\u4e4b\u524d\uff0c\u9875\u9762\u4e5f\u4e0d\u4f1a\u5b8c\u6210\u6e32\u67d3\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u5f02\u6b65\u52a0\u8f7d\u7684\u5b9e\u73b0<\/h3>\n<\/p>\n<p><h4>\u5f02\u6b65\u52a0\u8f7d\u673a\u5236<\/h4>\n<\/p>\n<p><p>\u5f02\u6b65\u52a0\u8f7d\u901a\u5e38\u662f\u6307\u8ba9\u6d4f\u89c8\u5668\u7ee7\u7eed\u89e3\u6790HTML\u6587\u6863\uff0c\u800c\u811a\u672c\u6587\u4ef6\u7684\u52a0\u8f7d\u548c\u6267\u884c\u88ab\u63a8\u8fdf\u6216\u8fdb\u884c\u5230\u5e76\u884c\u5904\u7406\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u5b9e\u73b0\uff0c\u6bd4\u5982\u4f7f\u7528HTML5\u7684<code>async<\/code>\u6216<code>defer<\/code>\u5c5e\u6027\uff0c\u6216\u8005\u4f7f\u7528JavaScript\u52a8\u6001\u521b\u5efa<code>&lt;script&gt;<\/code>\u6807\u7b7e\u3002<\/p>\n<\/p>\n<p><h4>\u4f7f\u7528async\u548cdefer\u5b9e\u73b0\u5f02\u6b65\u52a0\u8f7d<\/h4>\n<\/p>\n<p><p><strong>\u4f7f\u7528<code>async<\/code>\u5c5e\u6027<\/strong>\uff1a<\/p>\n<\/p>\n<p><p><code>async<\/code>\u5c5e\u6027\u5141\u8bb8\u811a\u672c\u5f02\u6b65\u52a0\u8f7d\u3002\u4e00\u65e6\u811a\u672c\u53ef\u7528\uff0c\u5b83\u5c06\u5c3d\u5feb\u6267\u884c\uff0c\u800c\u4e0d\u7528\u7b49\u5230\u9875\u9762\u89e3\u6790\u5b8c\u6210\u3002\u8fd9\u610f\u5473\u7740\u811a\u672c\u7684\u6267\u884c\u987a\u5e8f\u65e0\u6cd5\u4fdd\u8bc1\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-html\">&lt;script async src=&quot;async-script.js&quot;&gt;&lt;\/script&gt;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong>\u4f7f\u7528<code>defer<\/code>\u5c5e\u6027<\/strong>\uff1a<\/p>\n<\/p>\n<p><p>\u4e0e<code>async<\/code>\u5c5e\u6027\u7c7b\u4f3c\uff0c<code>defer<\/code>\u540c\u6837\u5141\u8bb8\u811a\u672c\u5728HTML\u89e3\u6790\u65f6\u5f02\u6b65\u52a0\u8f7d\uff0c\u4f46\u811a\u672c\u53ea\u4f1a\u5728\u6574\u4e2a\u9875\u9762\u89e3\u6790\u5b8c\u6210\u540e\u6267\u884c\u3002\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\uff0c\u811a\u672c\u7684\u6267\u884c\u987a\u968f\u662f\u76f8\u5bf9\u4e8e\u5b83\u4eec\u5728\u6587\u6863\u4e2d\u7684\u51fa\u73b0\u987a\u5e8f\u7684\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-html\">&lt;script defer src=&quot;deferred-script.js&quot;&gt;&lt;\/script&gt;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u52a8\u6001\u521b\u5efascript\u6807\u7b7e\u5b9e\u73b0\u5f02\u6b65\u52a0\u8f7d<\/h4>\n<\/p>\n<p><p>\u53ef\u4ee5\u901a\u8fc7JavaScript\u52a8\u6001\u521b\u5efa\u5e76\u63d2\u5165<code>&lt;script&gt;<\/code>\u6807\u7b7e\uff0c\u4ece\u800c\u5b9e\u73b0\u66f4\u7075\u6d3b\u7684\u5f02\u6b65\u52a0\u8f7d\u884c\u4e3a\u3002\u8fd9\u79cd\u6280\u672f\u53ef\u4ee5\u8ba9\u811a\u672c\u7684\u52a0\u8f7d\u4e0e\u9875\u9762\u7684\u5176\u5b83\u90e8\u5206\u5e76\u884c\u8fdb\u884c\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">var script = document.createElement(&#039;script&#039;);<\/p>\n<p>script.type = &#039;text\/javascript&#039;;<\/p>\n<p>script.src = 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