{"id":10135,"date":"2023-11-28T21:27:05","date_gmt":"2023-11-28T13:27:05","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=10135"},"modified":"2023-11-30T19:06:49","modified_gmt":"2023-11-30T11:06:49","slug":"javascript-zhong-bian-xie-yi-ge-getelementsbyclass","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/javascript-zhong-bian-xie-yi-ge-getelementsbyclass\/","title":{"rendered":"JavaScript \u4e2d\u7f16\u5199\u4e00\u4e2a getElementsByClassName \u5c01\u88c5\u51fd\u6570\uff1f"},"content":{"rendered":"<p>\u5f53\u7f16\u5199\u4e00\u4e2a\u7c7b\u4f3c\u4e8e <code>getElementsByClassName<\/code> \u7684\u5c01\u88c5\u51fd\u6570\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u6a21\u62df\u5b9e\u73b0\u7c7b\u4f3c\u7684\u529f\u80fd\uff0c\u4ee5\u4fbf\u4e8e\u83b7\u53d6\u5177\u6709\u6307\u5b9a\u7c7b\u540d\u7684 DOM \u5143\u7d20\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code class=\"language-javascript\">function getElementsByClassName(className) {\n  \/\/ \u68c0\u67e5\u6d4f\u89c8\u5668\u662f\u5426\u652f\u6301\u539f\u751f\u7684 getElementsByClassName \u65b9\u6cd5\n  if (document.getElementsByClassName) {\n    \/\/ \u5982\u679c\u652f\u6301\uff0c\u76f4\u63a5\u4f7f\u7528\u539f\u751f\u65b9\u6cd5\u8fd4\u56de\u7ed3\u679c\n    return document.getElementsByClassName(className);\n  } else {\n    \/\/ \u5982\u679c\u4e0d\u652f\u6301\uff0c\u624b\u52a8\u5b9e\u73b0\n    const elements = [];\n    const allElements = document.getElementsByTagName('*');\n\n    for (let i = 0; i &lt; allElements.length; i++) {\n      const currentElement = allElements[i];\n      const elementClasses = currentElement.className.split(' ');\n\n      if (elementClasses.indexOf(className) !== -1) {\n        elements.push(currentElement);\n      }\n    }\n\n    return elements;\n  }\n}\n<\/code><\/pre>\n<p>\u6b64\u51fd\u6570\u9996\u5148\u68c0\u67e5\u6d4f\u89c8\u5668\u662f\u5426\u652f\u6301\u539f\u751f\u7684 <code>getElementsByClassName<\/code> \u65b9\u6cd5\u3002\u5982\u679c\u652f\u6301\uff0c\u5219\u76f4\u63a5\u4f7f\u7528\u6d4f\u89c8\u5668\u63d0\u4f9b\u7684\u65b9\u6cd5\u3002\u5982\u679c\u4e0d\u652f\u6301\uff0c\u5219\u624b\u52a8\u904d\u5386\u6240\u6709\u5143\u7d20\uff0c\u627e\u5230\u5177\u6709\u6307\u5b9a\u7c7b\u540d\u7684\u5143\u7d20\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u8fd9\u4e9b\u5143\u7d20\u7684\u6570\u7ec4\u3002<\/p>\n<p>\u8bf7\u6ce8\u610f\uff0c\u8fd9\u53ea\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u6f14\u793a\u4f8b\u5b50\uff0c\u539f\u751f\u7684 <code>getElementsByClassName<\/code> \u65b9\u6cd5\u529f\u80fd\u66f4\u4e3a\u5b8c\u6574\u548c\u9ad8\u6548\u3002\u4f46\u8fd9\u4e2a\u624b\u52a8\u5b9e\u73b0\u53ef\u4ee5\u5728\u4e0d\u652f\u6301\u8be5\u65b9\u6cd5\u7684\u65e7\u6d4f\u89c8\u5668\u4e2d\u63d0\u4f9b\u7c7b\u4f3c\u7684\u529f\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u7f16\u5199\u4e00\u4e2a\u7c7b\u4f3c\u4e8e getElementsByClassName \u7684\u5c01\u88c5\u51fd\u6570\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u6a21\u62df\u5b9e\u73b0\u7c7b\u4f3c\u7684\u529f\u80fd\uff0c\u4ee5\u4fbf [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115],"tags":[],"class_list":["post-10135","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=10135"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10135\/revisions"}],"predecessor-version":[{"id":13671,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10135\/revisions\/13671"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=10135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=10135"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=10135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}