{"id":657,"date":"2025-01-01T18:33:17","date_gmt":"2025-01-01T10:33:17","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=657"},"modified":"2025-01-01T18:33:17","modified_gmt":"2025-01-01T10:33:17","slug":"%e5%9c%a8-javascript-%e4%b8%ad%ef%bc%8c%e6%a3%80%e6%9f%a5-dom-%e5%85%83%e7%b4%a0%e6%98%af%e5%90%a6%e5%8c%85%e5%90%ab%e7%89%b9%e5%ae%9a%e7%b1%bb%e9%83%bd%e6%9c%89%e5%93%aa%e4%ba%9b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/01\/01\/%e5%9c%a8-javascript-%e4%b8%ad%ef%bc%8c%e6%a3%80%e6%9f%a5-dom-%e5%85%83%e7%b4%a0%e6%98%af%e5%90%a6%e5%8c%85%e5%90%ab%e7%89%b9%e5%ae%9a%e7%b1%bb%e9%83%bd%e6%9c%89%e5%93%aa%e4%ba%9b%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u5728 JavaScript \u4e2d\uff0c\u68c0\u67e5 DOM \u5143\u7d20\u662f\u5426\u5305\u542b\u7279\u5b9a\u7c7b\u90fd\u6709\u54ea\u4e9b\u65b9\u6cd5\uff1f"},"content":{"rendered":"\n
\n

\u5728 JavaScript \u4e2d\u9ad8\u6548\u5730\u68c0\u67e5 DOM \u5143\u7d20\u662f\u5426\u5305\u542b\u7279\u5b9a\u7c7b\uff0c\u6700\u5e38\u7528\u548c\u9ad8\u6548\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u539f\u751f\u7684 classList.contains()<\/code> \u65b9\u6cd5\u3002\u8fd9\u4e2a\u65b9\u6cd5\u4e13\u95e8\u7528\u4e8e\u68c0\u67e5\u4e00\u4e2a\u5143\u7d20\u7684\u7c7b\u540d\u5217\u8868\u4e2d\u662f\u5426\u5305\u542b\u67d0\u4e2a\u7c7b\uff0c\u5e76\u4e14\u5b83\u662f\u975e\u5e38\u5feb\u901f\u7684\uff0c\u56e0\u4e3a\u5b83\u662f\u7531\u6d4f\u89c8\u5668\u5e95\u5c42\u5b9e\u73b0\u7684\u3002<\/p>\n<\/blockquote>\n\n\n\n

\n\n\n\n

1. \u4f7f\u7528 classList.contains()<\/code> \u65b9\u6cd5<\/strong><\/h3>\n\n\n\n

1.1 \u57fa\u672c\u7528\u6cd5<\/h4>\n\n\n\n
const element = document.getElementById('myElement');\n\nif (element.classList.contains('myClass')) {\n  console.log('Element contains the class');\n} else {\n  console.log('Element does not contain the class');\n}<\/code><\/pre>\n\n\n\n
    \n
  • element.classList<\/code> \u8fd4\u56de\u4e00\u4e2a DOMTokenList<\/code> \u5bf9\u8c61\uff0c\u5b83\u662f\u4e00\u4e2a\u7c7b\u540d\u7684\u96c6\u5408\uff0c\u63d0\u4f9b\u4e86\u8bb8\u591a\u65b9\u6cd5\u6765\u64cd\u4f5c\u7c7b\u540d\u3002<\/li>\n\n\n\n
  • contains()<\/code> \u65b9\u6cd5\u4f1a\u68c0\u67e5\u8be5\u5143\u7d20\u7684\u7c7b\u540d\u5217\u8868\u4e2d\u662f\u5426\u5b58\u5728\u6307\u5b9a\u7684\u7c7b\u540d\uff0c\u5982\u679c\u5b58\u5728\u8fd4\u56de true<\/code>\uff0c\u5426\u5219\u8fd4\u56de false<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n
    1.2 \u4f18\u70b9<\/h4>\n\n\n\n
      \n
    • \u6027\u80fd\u9ad8\u6548<\/strong>\uff1aclassList.contains()<\/code> \u662f\u539f\u751f\u5b9e\u73b0\uff0c\u6d4f\u89c8\u5668\u901a\u5e38\u4f1a\u8fdb\u884c\u4f18\u5316\uff0c\u56e0\u6b64\u5b83\u7684\u6267\u884c\u6548\u7387\u975e\u5e38\u9ad8\u3002<\/li>\n\n\n\n
    • \u7b80\u5355\u6613\u7528<\/strong>\uff1a\u8fd9\u662f\u4e00\u79cd\u7b80\u6d01\u4e14\u6613\u8bfb\u7684\u65b9\u6cd5\uff0c\u9002\u7528\u4e8e\u68c0\u67e5\u5355\u4e2a\u7c7b\u3002<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n
      2. \u5176\u4ed6\u65b9\u6cd5\uff1aclassName<\/code> \u6216 getAttribute()<\/code>\uff08\u4e0d\u63a8\u8350\uff09<\/strong><\/h3>\n\n\n\n
      \u867d\u7136 classList.contains()<\/code> \u662f\u6700\u63a8\u8350\u7684\u65b9\u5f0f\uff0c\u4f46\u4f60\u8fd8\u53ef\u4ee5\u4f7f\u7528 className<\/code> \u6216 getAttribute()<\/code> \u6765\u624b\u52a8\u68c0\u67e5\u7c7b\u540d\u3002\u8fd9\u91cc\u4ecb\u7ecd\u4e00\u4e0b\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u867d\u7136\u5b83\u4eec\u4e0d\u5982 classList.contains()<\/code> \u9ad8\u6548\u6216\u7b80\u6d01\u3002<\/p>\n\n\n\n
      2.1 \u4f7f\u7528 className<\/code> \u5c5e\u6027\uff08\u4e0d\u63a8\u8350\uff09<\/h4>\n\n\n\n
      const element = document.getElementById('myElement');\n\nif (element.className.split(' ').includes('myClass')) {\n  console.log('Element contains the class');\n} else {\n  console.log('Element does not contain the class');\n}<\/code><\/pre>\n\n\n\n
        \n
      • className<\/code> \u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5305\u542b\u6240\u6709\u7c7b\u540d\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n\n\n\n
      • \u6211\u4eec\u4f7f\u7528 split(' ')<\/code> \u5c06\u7c7b\u540d\u5b57\u7b26\u4e32\u5206\u5272\u6210\u4e00\u4e2a\u6570\u7ec4\uff0c\u7136\u540e\u4f7f\u7528 includes()<\/code> \u65b9\u6cd5\u68c0\u67e5\u6570\u7ec4\u4e2d\u662f\u5426\u5305\u542b\u76ee\u6807\u7c7b\u540d\u3002<\/li>\n\n\n\n
      • \u8fd9\u4e2a\u65b9\u6cd5\u7684\u6027\u80fd\u76f8\u5bf9\u8f83\u5dee\uff0c\u5c24\u5176\u662f\u5f53\u5143\u7d20\u6709\u5927\u91cf\u7c7b\u540d\u65f6\uff0c\u56e0\u4e3a\u6bcf\u6b21\u90fd\u8981\u5206\u5272\u5b57\u7b26\u4e32\u5e76\u8fdb\u884c\u6570\u7ec4\u67e5\u627e\u3002<\/li>\n<\/ul>\n\n\n\n
        2.2 \u4f7f\u7528 getAttribute('class')<\/code>\uff08\u4e0d\u63a8\u8350\uff09<\/h4>\n\n\n\n
        const element = document.getElementById('myElement');\n\nif (element.getAttribute('class').split(' ').includes('myClass')) {\n  console.log('Element contains the class');\n} else {\n  console.log('Element does not contain the class');\n}<\/code><\/pre>\n\n\n\n
          \n
        • getAttribute('class')<\/code> \u8fd4\u56de\u5143\u7d20\u7684 class<\/code> \u5c5e\u6027\u503c\uff08\u5373\u7c7b\u540d\u7684\u5b57\u7b26\u4e32\uff09\uff0c\u7136\u540e\u50cf\u4e0a\u9762\u7684\u4f8b\u5b50\u4e00\u6837\u8fdb\u884c\u5206\u5272\u548c\u68c0\u67e5\u3002<\/li>\n\n\n\n
        • \u8fd9\u79cd\u65b9\u6cd5\u5728\u73b0\u4ee3\u6d4f\u89c8\u5668\u4e2d\u4e0d\u5e38\u7528\uff0c\u56e0\u4e3a classList<\/code> \u63d0\u4f9b\u4e86\u66f4\u65b9\u4fbf\u4e14\u9ad8\u6548\u7684 API\u3002<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n
          3. \u6027\u80fd\u5bf9\u6bd4<\/strong><\/h3>\n\n\n\n
            \n
          • classList.contains()<\/code><\/strong>\uff1a\u6d4f\u89c8\u5668\u539f\u751f\u652f\u6301\uff0c\u6267\u884c\u6548\u7387\u9ad8\uff0c\u9002\u7528\u4e8e\u5927\u90e8\u5206\u60c5\u51b5\u3002<\/li>\n\n\n\n
          • className.split(' ').includes()<\/code> \u6216 getAttribute('class')<\/code><\/strong>\uff1a\u8fd9\u4e9b\u65b9\u6cd5\u9700\u8981\u89e3\u6790\u5b57\u7b26\u4e32\uff0c\u76f8\u5bf9\u6765\u8bf4\u6548\u7387\u8f83\u4f4e\uff0c\u5c24\u5176\u662f\u5f53\u7c7b\u540d\u5b57\u7b26\u4e32\u6bd4\u8f83\u957f\u6216\u9700\u8981\u9891\u7e41\u68c0\u67e5\u65f6\u3002<\/li>\n<\/ul>\n\n\n\n
            \n\n\n\n
            \u7ed3\u8bba<\/strong><\/h3>\n\n\n\n
              \n
            • \u6700\u63a8\u8350\u7684\u505a\u6cd5\u662f\u4f7f\u7528 classList.contains()<\/code><\/strong>\uff0c\u8fd9\u662f\u6700\u73b0\u4ee3\u3001\u7b80\u6d01\u4e14\u6027\u80fd\u6700\u4f73\u7684\u65b9\u6cd5\u3002<\/li>\n\n\n\n
            • \u907f\u514d\u4f7f\u7528 className.split(' ').includes()<\/code> \u6216 getAttribute('class')<\/code>\uff0c\u56e0\u4e3a\u5b83\u4eec\u4f1a\u5f15\u5165\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u5f00\u9500\uff0c\u7279\u522b\u662f\u5728\u5927\u91cf DOM \u5143\u7d20\u4e0a\u8fdb\u884c\u7c7b\u540d\u68c0\u67e5\u65f6\u3002<\/li>\n<\/ul>\n\n\n\n
              \u901a\u8fc7 classList.contains()<\/code>\uff0c\u4f60\u53ef\u4ee5\u9ad8\u6548\u4e14\u7b80\u4fbf\u5730\u68c0\u67e5\u5143\u7d20\u662f\u5426\u5305\u542b\u7279\u5b9a\u7c7b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
              \u5728 JavaScript \u4e2d\u9ad8\u6548\u5730\u68c0\u67e5 DOM \u5143\u7d20\u662f\u5426\u5305\u542b\u7279\u5b9a\u7c7b\uff0c\u6700\u5e38\u7528\u548c\u9ad8\u6548\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u539f\u751f\u7684 class […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[],"class_list":["post-657","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/657","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=657"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/657\/revisions"}],"predecessor-version":[{"id":658,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/657\/revisions\/658"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=657"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=657"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=657"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}