{"id":3173,"date":"2024-11-10T16:11:41","date_gmt":"2024-11-10T08:11:41","guid":{"rendered":"https:\/\/fwq.ai\/blog\/3173\/"},"modified":"2024-11-10T16:11:41","modified_gmt":"2024-11-10T08:11:41","slug":"%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%adjs-%e5%8a%a0%e8%bd%bd%e5%ae%8c%e6%88%90","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/3173\/","title":{"rendered":"\u5982\u4f55\u5224\u65adjs \u52a0\u8f7d\u5b8c\u6210"},"content":{"rendered":"<blockquote><p>\n  \u5224\u65ad javascript \u52a0\u8f7d\u5b8c\u6210\u7684\u65b9\u6cd5\u6709\uff1a\u76d1\u542c domcontentloaded \u4e8b\u4ef6\uff0c\u63a8\u8350\u4f7f\u7528\uff0c\u6700\u53ef\u9760\u76d1\u542c window.onload \u4e8b\u4ef6\uff0c\u51c6\u786e\u6027\u8f83\u4f4e\uff0c\u9002\u7528\u4e8e\u9875\u9762\u6240\u6709\u52a0\u8f7d\u5b8c\u6210\u8f6e\u8be2\u65b9\u6cd5\uff0c\u9002\u7528\u4e8e\u65e0\u6cd5\u4f7f\u7528\u4e8b\u4ef6\u76d1\u542c\u5668\u7684\u60c5\u51b5\u4f7f\u7528 promise\uff0c\u5904\u7406\u5f02\u6b65 javascript \u52a0\u8f7d\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/08\/2024110806100454485.jpg\" class=\"aligncenter\" title=\"\u5982\u4f55\u5224\u65adjs \u52a0\u8f7d\u5b8c\u6210\u63d2\u56fe\" alt=\"\u5982\u4f55\u5224\u65adjs \u52a0\u8f7d\u5b8c\u6210\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5224\u65ad JavaScript \u52a0\u8f7d\u5b8c\u6210<\/strong><\/p>\n<p>\u5728 Web \u5f00\u53d1\u4e2d\uff0c\u5224\u65ad JavaScript \u52a0\u8f7d\u5b8c\u6210\u5bf9\u4e8e\u786e\u4fdd\u5e94\u7528\u7a0b\u5e8f\u6b63\u786e\u8fd0\u884c\u81f3\u5173\u91cd\u8981\u3002\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff1a<\/p>\n<p><strong>1. \u76d1\u542c DOMContentLoaded \u4e8b\u4ef6<\/strong><\/p>\n<p>\u5f53 DOM\uff08\u6587\u6863\u5bf9\u8c61\u6a21\u578b\uff09\u52a0\u8f7d\u5b8c\u6210\u65f6\uff0c\u89e6\u53d1 DOMContentLoaded \u4e8b\u4ef6\u3002\u8fd9\u662f\u5224\u65ad JavaScript \u52a0\u8f7d\u5b8c\u6210\u7684\u6700\u53ef\u9760\u65b9\u6cd5\u3002<\/p>\n<pre>document.addEventListener(\"DOMContentLoaded\", function() {\n  \/\/ JavaScript \u5df2\u52a0\u8f7d\u5b8c\u6210\n});<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u76d1\u542c window.onload \u4e8b\u4ef6<\/strong><\/p>\n<p>window.onload \u4e8b\u4ef6\u5728\u9875\u9762\u52a0\u8f7d\u5b8c\u6210\u65f6\u89e6\u53d1\uff0c\u5305\u62ec\u56fe\u50cf\u3001\u811a\u672c\u548c\u6837\u5f0f\u8868\u3002\u7136\u800c\uff0c\u5b83\u4e0d\u5982 DOMContentLoaded \u4e8b\u4ef6\u51c6\u786e\uff0c\u56e0\u4e3a\u811a\u672c\u53ef\u80fd\u4f1a\u5728\u9875\u9762\u52a0\u8f7d\u540e\u3002<\/p>\n<pre>window.onload = function() {\n  \/\/ JavaScript \u5df2\u52a0\u8f7d\u5b8c\u6210\n};<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>3. \u8f6e\u8be2\u65b9\u6cd5<\/strong><\/p>\n<p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u65e0\u6cd5\u4f7f\u7528\u4e8b\u4ef6\u76d1\u542c\u5668\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528\u8f6e\u8be2\u65b9\u6cd5\u6765\u4e0d\u65ad\u68c0\u67e5\u811a\u672c\u662f\u5426\u5df2\u52a0\u8f7d\u3002<\/p>\n<pre>var interval = setInterval(function() {\n  if (window.scriptLoaded) {\n    \/\/ JavaScript \u5df2\u52a0\u8f7d\u5b8c\u6210\n    clearInterval(interval);\n  }\n}, 100);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>4. \u4f7f\u7528 Promise<\/strong><\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528 Promise \u6765\u5904\u7406\u5f02\u6b65 JavaScript \u52a0\u8f7d\u3002\u5f53\u811a\u672c\u52a0\u8f7d\u5b8c\u6210\u65f6\uff0cPromise \u5c06\u89e3\u6790\u3002<\/p>\n<pre>const scriptPromise = new Promise(function(resolve) {\n  document.addEventListener(\"DOMContentLoaded\", function() {\n    resolve();\n  });\n});\n\nscriptPromise.then(function() {\n  \/\/ JavaScript \u5df2\u52a0\u8f7d\u5b8c\u6210\n});<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n<ul>\n<li>\u6839\u636e\u5e94\u7528\u7a0b\u5e8f\u9700\u8981\u9009\u62e9\u6700\u9002\u5408\u7684\u65b9\u6cd5\u3002<\/li>\n<li>\u5c3d\u91cf\u4f7f\u7528 DOMContentLoaded \u4e8b\u4ef6\uff0c\u56e0\u4e3a\u5b83\u662f\u6700\u51c6\u786e\u7684\u3002<\/li>\n<li>\u907f\u514d\u4f7f\u7528 window.onload \u4e8b\u4ef6\uff0c\u56e0\u4e3a\u5b83\u53ef\u80fd\u4e0d\u592a\u51c6\u786e\u3002<\/li>\n<li>\u4ec5\u5728\u5fc5\u8981\u65f6\u4f7f\u7528\u8f6e\u8be2\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u5224\u65adjs \u52a0\u8f7d\u5b8c\u6210\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5224\u65ad javascript \u52a0\u8f7d\u5b8c\u6210\u7684\u65b9\u6cd5\u6709\uff1a\u76d1\u542c domcontentloaded \u4e8b\u4ef6\uff0c\u63a8\u8350\u4f7f\u7528\uff0c\u6700\u53ef\u9760\u76d1\u542c window.onload \u4e8b\u4ef6\uff0c\u51c6\u786e\u6027\u8f83\u4f4e\uff0c\u9002\u7528\u4e8e\u9875\u9762\u6240\u6709\u52a0\u8f7d\u5b8c\u6210\u8f6e\u8be2\u65b9\u6cd5\uff0c\u9002\u7528\u4e8e\u65e0\u6cd5\u4f7f\u7528\u4e8b\u4ef6\u76d1\u542c\u5668\u7684\u60c5\u51b5\u4f7f\u7528 promise\uff0c\u5904\u7406\u5f02\u6b65 javascript \u52a0\u8f7d \u5982\u4f55\u5224\u65ad JavaScript \u52a0\u8f7d\u5b8c\u6210 \u5728 Web \u5f00\u53d1\u4e2d\uff0c\u5224\u65ad JavaScript \u52a0\u8f7d\u5b8c\u6210\u5bf9\u4e8e\u786e\u4fdd\u5e94\u7528\u7a0b\u5e8f\u6b63\u786e\u8fd0\u884c\u81f3\u5173\u91cd\u8981\u3002\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff1a 1. \u76d1\u542c DOMContentLoaded \u4e8b\u4ef6 \u5f53 DOM\uff08\u6587\u6863\u5bf9\u8c61\u6a21\u578b\uff09\u52a0\u8f7d\u5b8c\u6210\u65f6\uff0c\u89e6\u53d1 DOMContentLoaded \u4e8b\u4ef6\u3002\u8fd9\u662f\u5224\u65ad JavaScript \u52a0\u8f7d\u5b8c\u6210\u7684\u6700\u53ef\u9760\u65b9\u6cd5\u3002 document.addEventListener(&#8220;DOMContentLoaded&#8221;, function() { \/\/ JavaScript \u5df2\u52a0\u8f7d\u5b8c\u6210 }); \u767b\u5f55\u540e\u590d\u5236 2. \u76d1\u542c window.onload \u4e8b\u4ef6 window.onload \u4e8b\u4ef6\u5728\u9875\u9762\u52a0\u8f7d\u5b8c\u6210\u65f6\u89e6\u53d1\uff0c\u5305\u62ec\u56fe\u50cf\u3001\u811a\u672c\u548c\u6837\u5f0f\u8868\u3002\u7136\u800c\uff0c\u5b83\u4e0d\u5982 DOMContentLoaded \u4e8b\u4ef6\u51c6\u786e\uff0c\u56e0\u4e3a\u811a\u672c\u53ef\u80fd\u4f1a\u5728\u9875\u9762\u52a0\u8f7d\u540e\u3002 window.onload = function() { \/\/ JavaScript \u5df2\u52a0\u8f7d\u5b8c\u6210 }; \u767b\u5f55\u540e\u590d\u5236 3. \u8f6e\u8be2\u65b9\u6cd5 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