{"id":197,"date":"2026-08-06T12:22:56","date_gmt":"2026-08-06T04:22:56","guid":{"rendered":"https:\/\/blog.huajimc.cn\/?p=197"},"modified":"2026-08-06T18:39:50","modified_gmt":"2026-08-06T10:39:50","slug":"jquery-event-delegation","status":"publish","type":"post","link":"https:\/\/blog.huajimc.cn\/index.php\/2026\/08\/06\/jquery-event-delegation\/","title":{"rendered":"jQuery: \u901a\u8fc7\u4e8b\u4ef6\u59d4\u6258\u89e3\u51b3\u52a8\u6001\u5143\u7d20\u4e8b\u4ef6\u7ed1\u5b9a\u5931\u6548\u95ee\u9898"},"content":{"rendered":"

\u95ee\u9898<\/h2>\n

\u5728\u524d\u7aef\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u4e3a\u52a8\u6001\u521b\u5efa\u7684\u5143\u7d20\u7ed1\u5b9a\u4e8b\u4ef6\uff0c\u7136\u800c\u4e00\u4e2a\u8be1\u5f02\u7684\u73b0\u8c61\u662f\uff0c\u6211\u4eec\u660e\u660e\u7ed1\u5b9a\u4e86\u4e8b\u4ef6\u4f46\u662f\u5374\u6ca1\u6709\u6b63\u5e38\u89e6\u53d1\u3002<\/p>\n

\u5728 jQuery \u4e2d\uff0c\u6211\u4eec\u5e38\u5e38\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5c06\u4e8b\u4ef6\u76f4\u63a5\u7ed1\u5b9a<\/strong>\u5230\u5143\u7d20\u4e0a\uff1a<\/p>\n

$('.submit-btn').on('click', function() {\n    \/\/ TO DO ...\n})<\/code><\/pre>\n
\u8fd9\u79cd\u65b9\u5f0f\u5bf9\u9759\u6001\u5143\u7d20\u662f\u6709\u6548\u7684\uff0c\u800c\u5bf9\u4e8e\u52a8\u6001\u5143\u7d20\uff0c\u8fd9\u79cd\u76f4\u63a5\u7ed1\u5b9a<\/strong>\u4e8b\u4ef6\u7684\u65b9\u6cd5\u662f\u65e0\u6548\u7684\u3002<\/p>\n
\u539f\u56e0<\/h2>\n
\u6838\u5fc3\u539f\u56e0\u662f jQuery \u7684\u76f4\u63a5\u7ed1\u5b9a\u65b9\u6cd5 $('selector').on(eventType, handler)<\/code> \u53ea\u5bf9\u811a\u672c\u6267\u884c\u65f6 DOM \u4e2d\u5df2\u5b58\u5728\u7684\u5143\u7d20\u751f\u6548\uff08\u4e5f\u5c31\u662f\u6211\u4eec\u76f4\u63a5\u5728 HTML \u91cc\u5199\u7684\u5143\u7d20\uff09\uff0c\u800c\u5bf9\u4e8e\u52a8\u6001\u5143\u7d20\uff0c\u9875\u9762\u52a0\u8f7d\u65f6\u5b83\u4eec\u8fd8\u6ca1\u6709\u88ab\u521b\u5efa\uff0c\u9009\u62e9\u5668\u65e0\u6cd5\u9009\u62e9\u5230\u8fd9\u4e9b\u5143\u7d20\uff0c\u81ea\u7136\u65e0\u6cd5\u5c06\u4e8b\u4ef6\u7ed1\u5b9a\u4e0a\u53bb\u3002<\/p>\n
\u89e3\u51b3\u65b9\u6cd5<\/h2>\n
\u5bf9\u4e8e\u52a8\u6001\u5143\u7d20\u4e8b\u4ef6\u7ed1\u5b9a\u5931\u6548\u95ee\u9898\uff0c\u5178\u578b\u7684\u89e3\u51b3\u65b9\u6cd5\u662f\u4f7f\u7528\u4e8b\u4ef6\u59d4\u6258<\/strong>\u3002\u4e8b\u4ef6\u59d4\u6258\u7684\u539f\u7406\u662f\u5c06\u4e8b\u4ef6\u7ed1\u5b9a\u5230\u4e00\u4e2a\u9759\u6001\u7684\u3001\u5df2\u7ecf\u5b58\u5728\u4e8e DOM \u7684\u7236\u5143\u7d20\uff08\u6216\u7956\u5148\u5143\u7d20\uff09\u4e0a\uff0c\u5f53\u4e8b\u4ef6\u5728\u5b50\u5143\u7d20\u4e0a\u89e6\u53d1\u65f6\uff0c\u7531\u4e8e\u4e8b\u4ef6\u5192\u6ce1\u673a\u5236\uff0c\u4e8b\u4ef6\u4f1a\u4e00\u8def\u5411\u4e0a\u5192\u6ce1\u5230\u8fd9\u4e2a\u7ed1\u5b9a\u4e86\u5904\u7406\u7a0b\u5e8f\u7684\u7236\u5143\u7d20\u4e0a\uff0c\u82e5\u89e6\u53d1\u4e8b\u4ef6\u7684\u5b50\u5143\u7d20\u4e0e\u7236\u5143\u7d20\u7ed1\u5b9a\u7684\u5b50\u5143\u7d20\u9009\u62e9\u5668\u5339\u914d\uff0c\u5219\u6267\u884c\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u3002<\/p>\n
\u4e8b\u4ef6\u59d4\u6258\u7684\u8bed\u6cd5\u5982\u4e0b\u3002\u5176\u4e2d\u82e5 childSelector<\/code> \u4e3a\u7a7a\uff0c\u5219\u662f\u76f4\u63a5\u7ed1\u5b9a<\/strong>\uff0c\u5f53\u4e8b\u4ef6\u53d1\u751f\u5728 parentSelector<\/code> \u4e0a\u6216\u4ece\u5176\u5b50\u5143\u7d20\u5192\u6ce1\u5230\u5176\u4e0a\u65f6\u5219\u4f1a\u89e6\u53d1\u5904\u7406\u7a0b\u5e8f\uff1b\u82e5 childSelector<\/code> \u4e0d\u4e3a\u7a7a\uff0c\u5219\u662f\u4e8b\u4ef6\u59d4\u6258<\/strong>\uff0c\u5f53\u4e8b\u4ef6\u76f4\u63a5\u5728 parentSelector<\/code> \u4e0a\u53d1\u751f\u65f6\uff0c\u5904\u7406\u7a0b\u5e8f\u4e0d\u4f1a\u88ab\u6267\u884c\uff0c\u53ea\u6709\u5f53\u4e8b\u4ef6\u53d1\u751f\u5728\u4e0e childSelector<\/code> \u5339\u914d\u7684\u540e\u4ee3\u5143\u7d20\u4e0a\u65f6\uff0c\u624d\u4f1a\u8c03\u7528\u5904\u7406\u7a0b\u5e8f\u3002<\/p>\n
$(parentSelector).on(eventType, childSelector, function(event) {\n    \/\/ \u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\n});<\/code><\/pre>\n
\u6211\u4eec\u901a\u8fc7\u4ee5\u4e0b\u793a\u4f8b\u8fdb\u884c\u7406\u89e3\uff1a<\/p>\n
<body>\n    <div class=\"container\">\n        <button id=\"btn-1\">\u6309\u94ae 1<\/button>\n        <button id=\"btn-2\">\u6309\u94ae 2<\/button>\n    <\/div>\n\n    <script>\n    $(document).on('click', '#btn-1', function() {\n        console.log('Button 1 is clicked.');\n    });\n    <\/script>\n<\/body><\/code><\/pre>\n
\u6211\u4eec\u5728 document<\/code>\uff08\u9875\u9762\u6700\u9876\u5c42\u7684\u5bb9\u5668\uff09\u4e0a\u59d4\u6258\u5904\u7406 #btn-1<\/code> \u7684 click \u4e8b\u4ef6\u3002\u5f53\u6211\u4eec\u70b9\u51fb #btn-1<\/code> \u65f6\uff0c\u4e8b\u4ef6\u7ecf .container<\/code>\u3001body<\/code>... \u4e00\u76f4\u5411\u4e0a\u5192\u6ce1\u5230 document<\/code>\uff0c\u7136\u540e jQuery \u5224\u65ad\u89e6\u53d1\u4e8b\u4ef6\u7684 target \u662f\u5426\u5339\u914d\u7ed1\u5b9a\u7684\u9009\u62e9\u5668 #btn-1<\/code>\uff0c\u82e5\u5339\u914d\uff0c\u5219\u6267\u884c\u56de\u8c03\u51fd\u6570\u3002\u540c\u7406\uff0c\u5f53\u6211\u4eec\u70b9\u51fb #btn-2<\/code> \u65f6\uff0c\u4e8b\u4ef6\u540c\u6837\u5192\u6ce1\u4e0a\u6765\uff0c\u4f46\u662f\u7531\u4e8e\u4e8b\u4ef6\u53d1\u751f\u5728 #btn-2<\/code> \u4e0a\uff0c\u4e0e\u7ed1\u5b9a\u7684\u9009\u62e9\u5668 #btn-1<\/code> \u4e0d\u5339\u914d\uff0c\u4e8e\u662f\u56de\u8c03\u51fd\u6570\u4e0d\u4f1a\u88ab\u6267\u884c\u3002<\/p>\n
\u901a\u8fc7\u4e8b\u4ef6\u59d4\u6258\uff0c\u7531\u4e8e\u4e8b\u4ef6\u5b9e\u9645\u662f\u7ed1\u5b9a\u5728\u5df2\u5b58\u5728\u7684\u7236\u5143\u7d20\u4e0a<\/strong>\uff0c\u6545\u4e0d\u4f1a\u51fa\u73b0\u56e0\u4e3a\u5143\u7d20\u4e0d\u5b58\u5728\u800c\u7ed1\u5b9a\u5931\u8d25\u7684\u60c5\u51b5\u3002\u65e0\u8bba\u5143\u7d20\u662f\u786c\u7f16\u7801\u7684\u8fd8\u662f\u52a8\u6001\u521b\u5efa\u7684\uff0c\u53ea\u8981\u5b83\u88ab\u70b9\u51fb\uff0c\u4e8b\u4ef6\u5c31\u4f1a\u5192\u6ce1\u5230\u4e0a\u5c42\u5143\u7d20\uff0c\u5e76\u7531\u4e0a\u5c42\u5143\u7d20\u4e0a\u7684\u59d4\u6258\u5904\u7406\u5668\u6355\u83b7\u5e76\u6267\u884c\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u52a8\u6001\u5143\u7d20\u7684\u4f8b\u5b50\u3002\u8fd9\u91cc\u540c\u65f6\u6709\u76f4\u63a5\u7ed1\u5b9a\u548c\u4e8b\u4ef6\u59d4\u6258\u4e24\u79cd\u4e8b\u4ef6\u7ed1\u5b9a\u65b9\u5f0f\u3002\u5bf9\u4e8e .list<\/code>\uff0c\u5b83\u662f HTML \u4e2d\u786c\u7f16\u7801\u7684\u5143\u7d20\uff0c\u9875\u9762\u52a0\u8f7d\u65f6\u5373\u5b58\u5728\uff0c\u6545\u6211\u4eec\u65e0\u9700\u4e8b\u4ef6\u59d4\u6258\uff0c\u76f4\u63a5\u7ed9\u5b83\u7ed1\u5b9a\u4e8b\u4ef6\u5373\u53ef\uff1b\u5bf9\u4e8e .list<\/code> \u4e0b\u7684 li<\/code>\uff0c\u5b83\u4eec\u662f\u5728\u70b9\u51fb\u6309\u94ae\u540e\u52a8\u6001\u6dfb\u52a0\u5230\u5217\u8868\u4e2d\u7684\uff0c\u9875\u9762\u52a0\u8f7d\u65f6\u5c1a\u4e0d\u5b58\u5728\uff0c\u56e0\u6b64\uff0c\u82e5\u6211\u4eec\u4ecd\u91c7\u7528\u76f4\u63a5\u7ed1\u5b9a\u7684\u65b9\u5f0f\uff0c\u5fc5\u7136\u662f\u7ed1\u5b9a\u4e0d\u4e0a\u7684\uff0c\u6211\u4eec\u9700\u8981\u5c06\u4e8b\u4ef6\u59d4\u6258\u5230\u67d0\u4e2a\u4e0a\u5c42\u5143\u7d20\u4e0a\uff0c\u8fd9\u91cc\u6211\u4eec\u76f4\u63a5\u59d4\u6258\u7ed9 .list<\/code>\uff0c\u5f53\u7136\u6211\u4eec\u4e5f\u53ef\u4ee5\u4ecd\u7136\u59d4\u6258\u7ed9 document<\/code> \u6216\u662f body<\/code> \u7b49\u5176\u4ed6\u4e0a\u5c42\u5143\u7d20\uff0c\u4e0d\u8fc7\u6211\u4eec\u5c3d\u91cf\u9009\u62e9\u79bb\u76ee\u6807\u5143\u7d20\u6700\u8fd1\u7684\u7236\u5143\u7d20\uff0c\u51cf\u5c11\u65e0\u6548\u5192\u6ce1\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n
<body>\n    <ul class=\"list\"><\/ul>\n    <button id=\"add-item\">Add Item<\/button>\n\n    <script>\n    $(function() {\n        $('#add-item').on('click', function() {\n            $('.list').append('<li>This is an item.<\/li>');\n        });\n\n        $('.list').on('click', 'li', function() {\n            alert('You clicked an item.');\n        });\n    });\n    <\/script>\n<\/body><\/code><\/pre>\n
\u603b\u7ed3<\/h2>\n
\u4e24\u79cd\u65b9\u5f0f\u5bf9\u6bd4<\/h3>\n
    \n
  • $('selector').on<\/code>\uff1a\u5c06\u4e8b\u4ef6\u76f4\u63a5\u7ed1\u5b9a\u5230\u5143\u7d20\u4e0a\uff0c\u53ea\u5bf9\u9759\u6001\u5143\u7d20\u6709\u6548\uff0c\u52a8\u6001\u52a0\u8f7d\u7684\u5143\u7d20\u65e0\u6cd5\u76f4\u63a5\u7ed1\u5b9a\u3002<\/li>\n
  • $(document).on<\/code>\uff1a\u5c06\u4e8b\u4ef6\u7ed1\u5b9a\u5230\u7a33\u5b9a\u7684\u7236\u5143\u7d20\u4e0a\u8fdb\u884c\u59d4\u6258\uff0c\u4e8b\u4ef6\u5192\u6ce1\u4e0a\u6765\u540e jQuery \u5224\u65ad\u76ee\u6807\u662f\u5426\u5339\u914d\uff0c\u51b3\u5b9a\u662f\u5426\u6267\u884c\uff0c\u5bf9\u52a8\u6001\/\u9759\u6001\u5143\u7d20\u5747\u6709\u6548\u3002<\/li>\n<\/ul>\n
    \u6ce8\u610f\u4e8b\u9879<\/h3>\n
      \n
    1. \u7236\u5143\u7d20\u9009\u62e9<\/strong>\uff1a\u5c3d\u91cf\u9009\u62e9\u79bb\u76ee\u6807\u5143\u7d20\u6700\u8fd1\u7684\u7a33\u5b9a\u7236\u5143\u7d20\u3002\u524d\u6587\u7684 $(document).on<\/code> \u53ea\u662f\u7528\u4ee5\u4f5c\u4e3a\u4e8b\u4ef6\u59d4\u6258\u7684\u5178\u578b\u4ee3\u8868\uff0c\u5e76\u4e0d\u662f\u8bf4\u4e00\u5b9a\u8981\u7ed1\u5b9a\u5728 document<\/code> \u4e0a\uff0c\u4f18\u5148\u7ed1\u5b9a\u5230\u6700\u8fd1\u7684\u7a33\u5b9a\u7236\u5143\u7d20\u4e0a\u53ef\u4ee5\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u4e8b\u4ef6\u5192\u6ce1\u5f00\u9500\u3002<\/li>\n
    2. \u5176\u4ed6\u573a\u666f<\/strong>\uff1a\u9664\u4e86\u52a8\u6001\u5143\u7d20\u573a\u666f\u5916\uff0c\u4e8b\u4ef6\u59d4\u6258\u5728\u6709\u5927\u91cf\u5b50\u5143\u7d20\u7684\u573a\u666f\u4e0b\u4e5f\u66f4\u4e3a\u9ad8\u6548\u3002\u4f8b\u5982\uff0c\u4e00\u4e2a ul<\/code> \u5217\u8868\u4e2d\u6709 1000 \u4e2a li<\/code> \u5b50\u5143\u7d20\uff0c\u5f53\u4f7f\u7528 $('ul li').on<\/code> \u76f4\u63a5\u7ed1\u5b9a\u65f6\uff0c\u5b9e\u9645\u4e0a\u662f\u4e3a\u6bcf\u4e2a\u5b50\u5143\u7d20\u90fd\u521b\u5efa\u4e86\u4e00\u4e2a\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u4e0d\u4ec5\u4f1a\u5360\u7528\u5927\u91cf\u5185\u5b58\uff0c\u8fd8\u9700\u8981\u6d88\u8017\u5927\u91cf\u8ba1\u7b97\u65f6\u95f4\u3002\u800c\u901a\u8fc7\u4e8b\u4ef6\u59d4\u6258\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728\u7236\u5143\u7d20\u4e0a\u6302\u8f7d 1 \u4e2a\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u7701\u53bb\u4e86\u5927\u91cf\u521b\u5efa\u76d1\u542c\u51fd\u6570\u7684\u65f6\u95f4\u548c\u5185\u5b58\u7a7a\u95f4\uff0c\u56e0\u6b64\uff0c\u5f53\u5b50\u5143\u7d20\u6570\u91cf\u8d8a\u591a\uff0c\u4e8b\u4ef6\u59d4\u6258\u5e26\u6765\u7684\u6027\u80fd\u63d0\u5347\u5c31\u8d8a\u660e\u663e\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
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