{"id":164341,"date":"2024-05-08T14:52:31","date_gmt":"2024-05-08T06:52:31","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/164341.html"},"modified":"2024-05-08T14:52:37","modified_gmt":"2024-05-08T06:52:37","slug":"web-%e5%89%8d%e7%ab%af-javascript-%e5%af%b9%e8%b1%a1%e7%9a%84%e5%be%aa%e7%8e%af%e9%81%8d%e5%8e%86%e6%96%b9%e6%b3%95%e6%9c%89%e5%93%aa%e4%ba%9b","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/164341.html","title":{"rendered":"web \u524d\u7aef Javascript \u5bf9\u8c61\u7684\u5faa\u73af\u904d\u5386\u65b9\u6cd5\u6709\u54ea\u4e9b"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26231215\/815bb371-3161-4445-bfff-50b3624e73c8.webp\" alt=\"web \u524d\u7aef Javascript \u5bf9\u8c61\u7684\u5faa\u73af\u904d\u5386\u65b9\u6cd5\u6709\u54ea\u4e9b\" \/><\/p>\n<p><p>\u5728Web\u524d\u7aef\u5f00\u53d1\u4e2d\uff0c\u5bf9JavaScript\u5bf9\u8c61\u8fdb\u884c\u5faa\u73af\u904d\u5386\u7684\u65b9\u6cd5\u4e3b\u8981\u6709\uff1a<strong><code>for...in<\/code>\u5faa\u73af\u3001<code>Object.keys()<\/code>\u65b9\u6cd5\u914d\u5408<code>forEach<\/code>\u5faa\u73af\u3001<code>Object.entries()<\/code>\u65b9\u6cd5\u914d\u5408<code>forEach<\/code>\u5faa\u73af\u3001<code>Object.values()<\/code>\u65b9\u6cd5\u914d\u5408<code>forEach<\/code>\u5faa\u73af\u3001\u4ee5\u53ca\u4f7f\u7528<code>for...of<\/code>\u7ed3\u6784\u914d\u5408<code>Object.entries()<\/code><\/strong>\u3002<strong><code>for...in<\/code>\u5faa\u73af<\/strong>\u662f\u6700\u76f4\u63a5\u7684\u4e00\u79cd\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u904d\u5386\u4e00\u4e2a\u5bf9\u8c61\u7684\u6240\u6709\u53ef\u679a\u4e3e\u5c5e\u6027\u3002\u4f46\u8fd9\u79cd\u65b9\u6cd5\u6709\u53ef\u80fd\u904d\u5386\u5230\u539f\u578b\u94fe\u4e0a\u7684\u5c5e\u6027\uff0c\u56e0\u6b64\u901a\u5e38\u914d\u5408<code>hasOwnProperty()<\/code>\u4f7f\u7528\u6765\u8fc7\u6ee4\u90a3\u4e9b\u975e\u8be5\u5bf9\u8c61\u81ea\u6709\u7684\u5c5e\u6027\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001FOR&#8230;IN\u5faa\u73af<\/h3>\n<\/p>\n<p><p><code>for...in<\/code>\u5faa\u73af\u662fJavaScript\u4e2d\u5bf9\u8c61\u904d\u5386\u7684\u57fa\u672c\u65b9\u6cd5\u3002\u5b83\u53ef\u4ee5\u904d\u5386\u4e00\u4e2a\u5bf9\u8c61\u7684\u6240\u6709\u53ef\u679a\u4e3e\u5c5e\u6027\uff0c\u5305\u62ec\u5176\u539f\u578b\u94fe\u4e0a\u7684\u5c5e\u6027\u3002\u57fa\u672c\u7528\u6cd5\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">for (let key in object) {<\/p>\n<p>    if (object.hasOwnProperty(key)) {<\/p>\n<p>        \/\/ \u4f60\u7684\u903b\u8f91\u4ee3\u7801<\/p>\n<p>    }<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4f7f\u7528<code>for...in<\/code>\u5faa\u73af\u65f6\uff0c\u5e94\u6ce8\u610f\u4f7f\u7528<code>hasOwnProperty()<\/code>\u65b9\u6cd5\u6765\u68c0\u67e5\u5c5e\u6027\u662f\u5426\u662f\u5bf9\u8c61\u81ea\u5df1\u7684\u5c5e\u6027\uff0c\u4ee5\u907f\u514d\u904d\u5386\u5230\u539f\u578b\u94fe\u4e0a\u4e0d\u5fc5\u8981\u7684\u5c5e\u6027\u3002\u867d\u7136\u8fd9\u79cd\u65b9\u6cd5\u7b80\u5355\u6613\u7528\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5982\u9700\u8981\u904d\u5386\u7684\u5bf9\u8c61\u5c5e\u6027\u6570\u91cf\u5e9e\u5927\u6216\u9700\u8981\u66f4\u52a0\u590d\u6742\u7684\u64cd\u4f5c\u65f6\uff0c\u53ef\u80fd\u4e0d\u662f\u6700\u4f18\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001OBJECT.KEYS()\u65b9\u6cd5\u914d\u5408FOREACH\u5faa\u73af<\/h3>\n<\/p>\n<p><p><code>Object.keys()<\/code>\u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e00\u4e2a\u7531\u4e00\u4e2a\u7ed9\u5b9a\u5bf9\u8c61\u7684\u81ea\u8eab\u53ef\u679a\u4e3e\u5c5e\u6027\u7ec4\u6210\u7684\u6570\u7ec4\uff0c\u6570\u7ec4\u4e2d\u5c5e\u6027\u540d\u7684\u6392\u5217\u987a\u5e8f\u662f\u548c\u5728\u901a\u8fc7\u5e38\u89c4\u5faa\u73af\u904d\u5386\u8be5\u5bf9\u8c61\u65f6\u8fd4\u56de\u7684\u987a\u5e8f\u4e00\u81f4\u7684\u3002\u7ed3\u5408<code>forEach<\/code>\u5faa\u73af\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">Object.keys(object).forEach(function(key) {<\/p>\n<p>    \/\/ \u4f60\u7684\u903b\u8f91\u4ee3\u7801<\/p>\n<p>});<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u52bf\u5728\u4e8e\uff0c\u5b83\u53ea\u4f1a\u904d\u5386\u5bf9\u8c61\u81ea\u8eab\u7684\u53ef\u679a\u4e3e\u5c5e\u6027\uff0c\u800c\u4e0d\u4f1a\u904d\u5386\u7ee7\u627f\u7684\u5c5e\u6027\u3002\u6b64\u5916\uff0c\u7531\u4e8e\u751f\u6210\u4e86\u5c5e\u6027\u540d\u7684\u6570\u7ec4\uff0c\u8fd8\u80fd\u5f88\u5bb9\u6613\u7684\u5b9e\u73b0\u5bf9\u5c5e\u6027\u540d\u7684\u5176\u4ed6\u6570\u7ec4\u64cd\u4f5c\uff0c\u5982\u8fc7\u6ee4\u3001\u6d4b\u8bd5\u7b49\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001OBJECT.ENTRIES()\u65b9\u6cd5\u914d\u5408FOREACH\u5faa\u73af<\/h3>\n<\/p>\n<p><p><code>Object.entries()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u7ed9\u5b9a\u5bf9\u8c61\u81ea\u8eab\u53ef\u679a\u4e3e\u5c5e\u6027\u7684\u952e\u503c\u5bf9\u6570\u7ec4\u3002\u5b83\u7684\u7528\u6cd5\u7c7b\u4f3c\u4e8e<code>Object.keys()<\/code>\uff0c\u4f46\u5b83\u63d0\u4f9b\u7684\u662f[key, value]\u5f62\u5f0f\u7684\u6570\u7ec4\uff0c\u8fd9\u4f7f\u5f97\u6211\u4eec\u5728\u5faa\u73af\u8bbf\u95ee\u5c5e\u6027\u65f6\u53ef\u4ee5\u540c\u65f6\u83b7\u53d6\u952e\u548c\u503c\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">Object.entries(object).forEach(([key, value]) =&gt; {<\/p>\n<p>    \/\/ \u4f60\u7684\u903b\u8f91\u4ee3\u7801<\/p>\n<p>});<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4f7f\u7528<code>Object.entries()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u7b80\u5316\u4ee3\u7801\uff0c\u5c24\u5176\u662f\u5f53\u6211\u4eec\u5728\u5faa\u73af\u4e2d\u65e2\u9700\u8981\u5c5e\u6027\u540d(key)\u53c8\u9700\u8981\u5c5e\u6027\u503c(value)\u65f6\uff0c\u8fd9\u79cd\u65b9\u6cd5\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001OBJECT.VALUES()\u65b9\u6cd5\u914d\u5408FOREACH\u5faa\u73af<\/h3>\n<\/p>\n<p><p><code>Object.values()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u7ed9\u5b9a\u5bf9\u8c61\u81ea\u8eab\u53ef\u679a\u4e3e\u5c5e\u6027\u503c\u7ec4\u6210\u7684\u6570\u7ec4\uff0c\u4e14\u6570\u7ec4\u4e2d\u503c\u7684\u6392\u5217\u987a\u5e8f\u4e0e\u901a\u8fc7<code>for...in<\/code>\u5faa\u73af\uff08\u6216<code>Object.keys()<\/code>\u65b9\u6cd5\uff09\u904d\u5386\u8be5\u5bf9\u8c61\u65f6\u8fd4\u56de\u7684\u987a\u5e8f\u4e00\u81f4\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">Object.values(object).forEach(value =&gt; {<\/p>\n<p>    \/\/ \u4f60\u7684\u903b\u8f91\u4ee3\u7801<\/p>\n<p>});<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u53ea\u5173\u5fc3\u5bf9\u8c61\u4e2d\u503c\u7684\u60c5\u51b5\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u751f\u6210\u503c\u7684\u6570\u7ec4\u6765\u6267\u884c\u6570\u7ec4\u65b9\u6cd5\uff0c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u7075\u6d3b\u6027\u3002<\/p>\n<\/p>\n<p><h3>\u4e94\u3001FOR&#8230;OF\u7ed3\u6784\u914d\u5408OBJECT.ENTRIES()<\/h3>\n<\/p>\n<p><p>\u5728ES6\u4e2d\uff0c<code>for...of<\/code>\u8bed\u53e5\u4e3a\u904d\u5386\u6570\u7ec4\uff08\u5305\u62ec\u6570\u7ec4\u3001\u7c7b\u6570\u7ec4\u5bf9\u8c61\u3001\u4ee5\u53ca\u8fed\u4ee3\u5668\u548c\u751f\u6210\u5668\u5bf9\u8c61\uff09\u4e2d\u7684\u503c\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684\u8fed\u4ee3\u6784\u9020\u3002\u5f53\u548c<code>Object.entries()<\/code>\u7ed3\u5408\u4f7f\u7528\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u5982\u6b64\u904d\u5386\u4e00\u4e2a\u5bf9\u8c61\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">for (let [key, value] of Object.entries(object)) {<\/p>\n<p>    \/\/ \u4f60\u7684\u903b\u8f91\u4ee3\u7801<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u5f0f\u7ed3\u5408\u4e86<code>for...of<\/code>\u7684\u7b80\u6d01\u8bed\u6cd5\u548c<code>Object.entries()<\/code>\u952e\u503c\u5bf9\u6570\u7ec4\u7684\u76f4\u89c2\u6027\uff0c\u7f16\u5199\u8d77\u6765\u65e2\u7b80\u5355\u53c8\u6e05\u6670\u3002<\/p>\n<\/p>\n<p><p>\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u573a\u666f\uff0c\u5f00\u53d1\u8005\u5e94\u6839\u636e\u5b9e\u9645\u5f00\u53d1\u9700\u6c42\uff0c\u9009\u62e9\u6700\u5408\u9002\u7684\u904d\u5386\u65b9\u6cd5\u3002\u5728\u65b0\u7684ES6\u8bed\u6cd5\u4e2d\uff0c<code>for...of<\/code>\u7ed3\u5408<code>Object.entries()<\/code>\u56e0\u5176\u7b80\u6377\u6027\u548c\u76f4\u89c2\u6027\uff0c\u5df2\u7ecf\u53d8\u5f97\u8d8a\u6765\u8d8a\u6d41\u884c\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>\u5982\u4f55\u904d\u5386 JavaScript \u5bf9\u8c61\u4e2d\u7684\u5c5e\u6027\u548c\u503c\uff1f<\/strong><\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528 for-in \u5faa\u73af\u6765\u904d\u5386 JavaScript \u5bf9\u8c61\u7684\u5c5e\u6027\u3002for-in \u5faa\u73af\u4f1a\u8fed\u4ee3\u5bf9\u8c61\u7684\u6bcf\u4e2a\u53ef\u679a\u4e3e\u5c5e\u6027\uff0c\u5e76\u53ef\u4ee5\u83b7\u53d6\u5c5e\u6027\u7684\u540d\u79f0\u548c\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-javascript\">for (var key in obj) {\n  if (obj.hasOwnProperty(key)) {\n    var value = obj[key];\n    console.log(key + &quot;: &quot; + value);\n  }\n}\n<\/code><\/pre>\n<p><strong>\u5982\u4f55\u904d\u5386 JavaScript \u5bf9\u8c61\u4e2d\u7684\u5c5e\u6027\uff0c\u4f46\u4e0d\u5305\u62ec\u539f\u578b\u94fe\u4e0a\u7684\u5c5e\u6027\uff1f<\/strong><\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528 Object.keys() \u65b9\u6cd5\u6765\u83b7\u53d6 JavaScript \u5bf9\u8c61\u7684\u6240\u6709\u5c5e\u6027\uff0c\u7136\u540e\u4f7f\u7528 forEach() \u65b9\u6cd5\u8fdb\u884c\u904d\u5386\u3002\u8fd9\u79cd\u65b9\u6cd5\u53ea\u4f1a\u904d\u5386\u5bf9\u8c61\u81ea\u8eab\u7684\u5c5e\u6027\uff0c\u800c\u4e0d\u5305\u62ec\u539f\u578b\u94fe\u4e0a\u7684\u5c5e\u6027\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-javascript\">Object.keys(obj).forEach(function(key) {\n  var value = obj[key];\n  console.log(key + &quot;: &quot; + value);\n});\n<\/code><\/pre>\n<p><strong>\u5982\u4f55\u4f7f\u7528 ES6 \u7684 for-of \u5faa\u73af\u904d\u5386 JavaScript \u5bf9\u8c61\u4e2d\u7684\u503c\uff1f<\/strong><\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528 Object.values() \u65b9\u6cd5\u5c06 JavaScript \u5bf9\u8c61\u7684\u503c\u8f6c\u6362\u4e3a\u6570\u7ec4\uff0c\u7136\u540e\u4f7f\u7528 for-of \u5faa\u73af\u8fdb\u884c\u904d\u5386\u3002\u8fd9\u79cd\u65b9\u6cd5\u53ea\u80fd\u904d\u5386\u5bf9\u8c61\u7684\u503c\uff0c\u5e76\u4e0d\u80fd\u83b7\u53d6\u5c5e\u6027\u540d\u79f0\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-javascript\">for (var value of Object.values(obj)) {\n  console.log(value);\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u5728Web\u524d\u7aef\u5f00\u53d1\u4e2d\uff0c\u5bf9JavaScript\u5bf9\u8c61\u8fdb\u884c\u5faa\u73af\u904d\u5386\u7684\u65b9\u6cd5\u4e3b\u8981\u6709\uff1afor&#8230;in\u5faa\u73af\u3001Object.k [&hellip;]","protected":false},"author":3,"featured_media":164353,"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\/164341"}],"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=164341"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/164341\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/164353"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=164341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=164341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=164341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}