{"id":91035,"date":"2024-04-09T18:19:20","date_gmt":"2024-04-09T10:19:20","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/91035.html"},"modified":"2024-04-09T18:19:21","modified_gmt":"2024-04-09T10:19:21","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8javascript%e4%b8%ad%e4%bc%98%e5%8c%96%e5%be%aa%e7%8e%af","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/91035.html","title":{"rendered":"\u5982\u4f55\u5728JavaScript\u4e2d\u4f18\u5316\u5faa\u73af"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/02150831\/65566f4e-ea03-4e3b-9f44-ed2ef84c97a4.webp\" alt=\"\u5982\u4f55\u5728JavaScript\u4e2d\u4f18\u5316\u5faa\u73af\" \/><\/p>\n<p><p>\u5728JavaScript\u4e2d\uff0c\u8981<strong>\u4f18\u5316\u5faa\u73af\uff0c\u53ef\u4ee5\u91c7\u53d6\u4ee5\u4e0b\u7b56\u7565\uff1a\u51cf\u5c11\u5faa\u73af\u6b21\u6570\u3001\u7f13\u5b58\u6570\u7ec4\u957f\u5ea6\u3001\u4f7f\u7528\u5408\u9002\u7684\u5faa\u73af\u8bed\u53e5\u3001\u51cf\u5c11\u5faa\u73af\u5185\u90e8\u8ba1\u7b97\u91cf\u3001\u4f7f\u7528\u4f4d\u8fd0\u7b97\u3001\u91c7\u7528Web Workers\u8fdb\u884c\u591a\u7ebf\u7a0b\u5faa\u73af\u5904\u7406\u3001\u5bf9DOM\u64cd\u4f5c\u8fdb\u884c\u4f18\u5316\u6216\u8005\u4f7f\u7528\u66f4\u9ad8\u6548\u7684\u7b97\u6cd5<\/strong>\u7b49\u3002\u7279\u522b\u662f\u5728\u5904\u7406\u5927\u6570\u636e\u96c6\u6216\u8005\u9ad8\u6027\u80fd\u9700\u6c42\u65f6\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n<p><p>\u4f8b\u5982\uff0c\u5bf9\u4e8e<strong>\u7f13\u5b58\u6570\u7ec4\u957f\u5ea6<\/strong>\uff0c\u4ee5\u51cf\u5c11\u6bcf\u6b21\u5faa\u73af\u65f6\u5bf9\u6570\u7ec4\u957f\u5ea6\u5c5e\u6027\u7684\u67e5\u8be2\uff0c\u53ef\u663e\u8457\u63d0\u5347\u5faa\u73af\u6027\u80fd\u3002\u5728\u4f20\u7edf\u7684<code>for<\/code>\u5faa\u73af\u4e2d\uff0c\u5982\u679c\u5728\u5faa\u73af\u6761\u4ef6\u4e2d\u76f4\u63a5\u4f7f\u7528\u6570\u7ec4\u7684<code>length<\/code>\u5c5e\u6027\u4f5c\u4e3a\u7ed3\u675f\u6761\u4ef6\uff0c\u6bcf\u6b21\u5faa\u73af\u8fed\u4ee3\u90fd\u4f1a\u91cd\u65b0\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6\uff0c\u8fd9\u5c31\u9020\u6210\u4e86\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u6d88\u8017\u3002\u53ef\u4ee5\u5c06\u6570\u7ec4\u957f\u5ea6\u7f13\u5b58\u5728\u4e00\u4e2a\u53d8\u91cf\u4e2d\uff0c\u4f7f\u5f97\u5faa\u73af\u53ea\u9700\u8ba1\u7b97\u4e00\u6b21\u957f\u5ea6\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">for (var i = 0, len = array.length; i &lt; len; i++) {<\/p>\n<p>    \/\/ \u5faa\u73af\u4f53\u5185\u7684\u4ee3\u7801<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c<strong>\u6570\u7ec4\u957f\u5ea6<\/strong>\u53ea\u5728\u5faa\u73af\u5f00\u59cb\u524d\u8ba1\u7b97\u4e00\u6b21\uff0c\u4ece\u800c\u63d0\u5347\u4e86\u5faa\u73af\u7684\u6548\u7387\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u51cf\u5c11\u5faa\u73af\u6b21\u6570<\/h3>\n<\/p>\n<p><p><strong>\u5408\u5e76\u5faa\u73af<\/strong>\uff1a\u5982\u679c\u6709\u591a\u4e2a\u5faa\u73af\u53ef\u4ee5\u5904\u7406\u76f8\u540c\u7684\u6570\u636e\u96c6\u5408\uff0c\u5408\u5e76\u8fd9\u4e9b\u5faa\u73af\u4e3a\u4e00\u4e2a\u5355\u72ec\u7684\u5faa\u73af\u53ef\u4ee5\u51cf\u5c11\u8fed\u4ee3\u7684\u603b\u6b21\u6570\u3002<\/p>\n<\/p>\n<p><p><strong>\u8df3\u51fa\u5faa\u73af<\/strong>\uff1a\u5f53\u8fbe\u5230\u67d0\u4e2a\u6761\u4ef6\u65f6\uff0c\u4f7f\u7528<code>break<\/code>\u8bed\u53e5\u63d0\u524d\u9000\u51fa\u5faa\u73af\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8fed\u4ee3\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u9009\u62e9\u5408\u9002\u7684\u5faa\u73af<\/h3>\n<\/p>\n<p><p><strong><code>for<\/code>\u4e0e<code>while<\/code><\/strong>\uff1a<code>for<\/code>\u5faa\u73af\u6bd4<code>while<\/code>\u5faa\u73af\u8bed\u4e49\u66f4\u660e\u786e\uff0c\u9002\u7528\u4e8e\u77e5\u9053\u786e\u5207\u7684\u5faa\u73af\u6b21\u6570\u7684\u60c5\u51b5\u3002<code>while<\/code>\u5faa\u73af\u9002\u5408\u5faa\u73af\u6b21\u6570\u4e0d\u786e\u5b9a\u6216\u8005\u5faa\u73af\u76f4\u5230\u6ee1\u8db3\u67d0\u4e00\u6761\u4ef6\u4e3a\u6b62\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n<p><p><strong><code>for...of<\/code>\u5faa\u73af<\/strong>\uff1a\u5728\u5904\u7406\u6570\u7ec4\u548c\u7c7b\u6570\u7ec4\u5bf9\u8c61\uff08\u5982<code>NodeList<\/code>\uff09\u65f6\uff0c<code>for...of<\/code>\u5faa\u73af\u63d0\u4f9b\u4e86\u7b80\u6d01\u7684\u8bed\u6cd5\uff0c\u4e14\u6027\u80fd\u5f80\u5f80\u4f18\u4e8e\u4f20\u7edf\u7684<code>for<\/code>\u5faa\u73af\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u51cf\u5c11\u5faa\u73af\u5185\u90e8\u8ba1\u7b97\u91cf<\/h3>\n<\/p>\n<p><p><strong>\u5c40\u90e8\u53d8\u91cf<\/strong>\uff1a\u5728\u5faa\u73af\u5185\u90e8\uff0c\u5c3d\u53ef\u80fd\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf\u4ee5\u51cf\u5c11\u67e5\u627e\u53d8\u91cf\u6240\u9700\u7684\u65f6\u95f4\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u5168\u5c40\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><p><strong>\u6700\u5c0f\u5316DOM\u8bbf\u95ee<\/strong>\uff1aDOM\u64cd\u4f5c\u662f\u6602\u8d35\u7684\uff0c\u5c06DOM\u76f8\u5173\u7684\u64cd\u4f5c\u653e\u5728\u5faa\u73af\u4e4b\u5916\uff0c\u6216\u8005\u5c3d\u53ef\u80fd\u51cf\u5c11\u8fd9\u4e9b\u64cd\u4f5c\u7684\u6b21\u6570\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u4f7f\u7528\u4f4d\u8fd0\u7b97\u4f18\u5316<\/h3>\n<\/p>\n<p><p>\u4f4d\u8fd0\u7b97\u5728\u5f88\u591a\u60c5\u51b5\u4e0b\u6bd4\u5e38\u89c4\u7684\u7b97\u672f\u8fd0\u7b97\u66f4\u5feb\uff0c\u53ef\u4ee5\u8003\u8651\u5728\u5408\u9002\u7684\u573a\u5408\u4f7f\u7528\u4f4d\u8fd0\u7b97\u6765\u4f18\u5316\u6027\u80fd\uff0c\u4f8b\u5982\u4f7f\u7528<code>&gt;&gt;<\/code>\u6765\u66ff\u4ee3\u9664\u4ee52\u7684\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<p><h3>\u4e94\u3001\u91c7\u7528Web Workers\u8fdb\u884c\u591a\u7ebf\u7a0b\u5faa\u73af\u5904\u7406<\/h3>\n<\/p>\n<p><p>\u5f53\u6709\u5927\u91cf\u7684\u6570\u636e\u9700\u8981\u5904\u7406\u65f6\uff0c\u53ef\u4ee5\u91c7\u7528Web Workers\u6765\u521b\u5efa\u4e00\u4e2a\u5355\u72ec\u7684\u7ebf\u7a0b\uff0c\u4ece\u800c\u4e0d\u963b\u585e\u4e3b\u7ebf\u7a0b\u3002\u901a\u8fc7\u5c06\u4efb\u52a1\u5206\u914d\u7ed9Web Worker\uff0c\u53ef\u4ee5\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u7684\u54cd\u5e94\u901f\u5ea6\u548c\u6027\u80fd\u3002<\/p>\n<\/p>\n<p><h3>\u516d\u3001DOM\u64cd\u4f5c\u7684\u4f18\u5316<\/h3>\n<\/p>\n<p><p>\u5c06\u5bf9DOM\u7684\u64cd\u4f5c\u96c6\u4e2d\u8d77\u6765\uff0c\u4f7f\u7528\u6587\u6863\u7247\u6bb5\uff08<code>DocumentFragment<\/code>\uff09\u6216\u6279\u91cf\u66f4\u65b0\u5c5e\u6027\uff0c\u5728\u5fc5\u8981\u7684\u65f6\u523b\u4e00\u6b21\u6027\u5c06\u66f4\u65b0\u5e94\u7528\u5230DOM\u4e0a\uff0c\u6765\u51cf\u5c11\u56de\u6d41\u548c\u91cd\u7ed8\u3002<\/p>\n<\/p>\n<p><h3>\u4e03\u3001\u4f7f\u7528\u9ad8\u6548\u7684\u7b97\u6cd5<\/h3>\n<\/p>\n<p><p>\u5faa\u73af\u4f18\u5316\u4e0d\u4ec5\u5c40\u9650\u4e8e\u5faa\u73af\u672c\u8eab\uff0c\u8fd8\u5e94\u6d89\u53ca\u5230\u5faa\u73af\u5185\u90e8\u6240\u6267\u884c\u7684\u7b97\u6cd5\u3002\u5728\u6570\u636e\u96c6\u8f83\u5927\u65f6\uff0c\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7ed3\u6784\u548c\u7b97\u6cd5\uff0c\u5c3d\u91cf\u51cf\u5c11\u65f6\u95f4\u590d\u6742\u5ea6\uff0c\u4f1a\u5927\u5e45\u5ea6\u63d0\u5347\u6027\u80fd\u3002<\/p>\n<\/p>\n<p><p>\u603b\u800c\u8a00\u4e4b\uff0c\u4f18\u5316JavaScript\u4e2d\u7684\u5faa\u73af\u9700\u8981\u7efc\u5408\u8003\u8651\u591a\u79cd\u7b56\u7565\u3002\u5b9e\u65bd\u4e0a\u8ff0\u4f18\u5316\u63aa\u65bd\u65f6\uff0c\u4e0d\u5e94\u8be5\u727a\u7272\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff0c\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u9700\u6c42\uff0c\u6743\u8861\u6027\u80fd\u548c\u4ee3\u7801\u7b80\u6d01\u6027\u4e4b\u95f4\u7684\u5e73\u8861\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. \u5982\u4f55\u4f7f\u7528\u7f13\u5b58\u63d0\u9ad8\u5faa\u73af\u6027\u80fd\uff1f<\/strong><br \/>\n\u5faa\u73af\u4e2d\u7684\u8bb8\u591a\u8ba1\u7b97\u7ed3\u679c\u53ef\u80fd\u662f\u91cd\u590d\u7684\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528\u53d8\u91cf\u5c06\u8fd9\u4e9b\u7ed3\u679c\u4fdd\u5b58\u8d77\u6765\uff0c\u4ee5\u4fbf\u5728\u5faa\u73af\u7684\u4e0b\u4e00\u6b21\u8fed\u4ee3\u4e2d\u76f4\u63a5\u4f7f\u7528\u3002\u8fd9\u53ef\u4ee5\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u8ba1\u7b97\uff0c\u63d0\u9ad8\u5faa\u73af\u7684\u6548\u7387\u3002<\/p>\n<p><strong>2. \u5982\u4f55\u907f\u514d\u5728\u5faa\u73af\u5185\u90e8\u8fdb\u884c\u91cd\u590d\u7684DOM\u64cd\u4f5c\uff1f<\/strong><br \/>\n\u5faa\u73af\u4e2d\u9891\u7e41\u7684DOM\u64cd\u4f5c\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u4e3a\u4e86\u4f18\u5316\u5faa\u73af\uff0c\u5728\u5faa\u73af\u5916\u90e8\u5148\u5c06\u9700\u8981\u64cd\u4f5c\u7684DOM\u5143\u7d20\u5b58\u50a8\u5728\u53d8\u91cf\u4e2d\uff0c\u7136\u540e\u5728\u5faa\u73af\u5185\u90e8\u76f4\u63a5\u4f7f\u7528\u8fd9\u4e9b\u53d8\u91cf\u8fdb\u884c\u64cd\u4f5c\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u91cd\u590d\u7684DOM\u67e5\u8be2\u548c\u64cd\u4f5c\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<p><strong>3. \u5982\u4f55\u4f7f\u7528\u4f18\u5316\u7684\u7b97\u6cd5\u6539\u8fdb\u5faa\u73af\u7684\u6548\u7387\uff1f<\/strong><br \/>\n\u6709\u65f6\u5019\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u4f18\u5316\u7684\u7b97\u6cd5\u6765\u66ff\u4ee3\u7b80\u5355\u7684\u5faa\u73af\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e8c\u5206\u67e5\u627e\u7b97\u6cd5\u5728\u6709\u5e8f\u6570\u7ec4\u4e2d\u67e5\u627e\u5143\u7d20\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u7b80\u5355\u7684\u7ebf\u6027\u5faa\u73af\u3002\u9009\u62e9\u5408\u9002\u7684\u7b97\u6cd5\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u5faa\u73af\u7684\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728JavaScript\u4e2d\uff0c\u8981\u4f18\u5316\u5faa\u73af\uff0c\u53ef\u4ee5\u91c7\u53d6\u4ee5\u4e0b\u7b56\u7565\uff1a\u51cf\u5c11\u5faa\u73af\u6b21\u6570\u3001\u7f13\u5b58\u6570\u7ec4\u957f\u5ea6\u3001\u4f7f\u7528\u5408\u9002\u7684\u5faa\u73af\u8bed\u53e5\u3001\u51cf\u5c11\u5faa [&hellip;]","protected":false},"author":3,"featured_media":91036,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/91035"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=91035"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/91035\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/91036"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=91035"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=91035"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=91035"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}