{"id":167778,"date":"2024-05-08T16:09:47","date_gmt":"2024-05-08T08:09:47","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/167778.html"},"modified":"2024-05-08T16:09:51","modified_gmt":"2024-05-08T08:09:51","slug":"javascript-%e4%b8%ad%e8%87%aa%e5%ae%9a%e4%b9%89%e4%ba%8b%e4%bb%b6%e7%9a%84%e6%9c%ba%e5%88%b6%e6%98%af%e6%80%8e%e6%a0%b7%e7%9a%84","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/167778.html","title":{"rendered":"JavaScript \u4e2d\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u7684\u673a\u5236\u662f\u600e\u6837\u7684"},"content":{"rendered":"

\"JavaScript<\/p>\n

JavaScript \u4e2d\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u7684\u673a\u5236<\/strong>\u5305\u62ec\u521b\u5efa\u4e8b\u4ef6\u3001\u5b9a\u4e49\u4e8b\u4ef6\u7ec6\u8282\u3001\u6d3e\u53d1\u4e8b\u4ef6\u3001\u76d1\u542c\u4e8b\u4ef6\u548c\u4e8b\u4ef6\u4f20\u64ad\u3002\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u5141\u8bb8\u5f00\u53d1\u8005\u521b\u5efa\u5177\u6709\u7279\u5b9a\u529f\u80fd\u548c\u4e1a\u52a1\u903b\u8f91\u7684\u4e8b\u4ef6\uff0c\u8fd9\u4e2a\u673a\u5236\u901a\u5e38\u901a\u8fc7 Event<\/code> \u6784\u9020\u5668\u6216\u8005 CustomEvent<\/code> \u6784\u9020\u5668\u5b9e\u73b0\u3002\u4e8b\u4ef6\u7684\u6d3e\u53d1<\/strong>\u901a\u8fc7\u8c03\u7528\u76ee\u6807\u5143\u7d20\u7684 dispatchEvent<\/code> \u65b9\u6cd5\u5b8c\u6210\uff0c\u800c\u4e8b\u4ef6\u7684\u76d1\u542c\u5219\u901a\u8fc7 addEventListener<\/code> \u65b9\u6cd5<\/strong>\u4f7f\u5f97\u76d1\u542c\u8005\u80fd\u54cd\u5e94\u8fd9\u4e9b\u4e8b\u4ef6\u3002<\/p>\n<\/p>\n

\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u80fd\u591f\u5728\u7ec4\u4ef6\u6216\u8005\u6a21\u5757\u4e4b\u95f4\u63d0\u4f9b\u4e00\u4e2a\u7075\u6d3b\u7684\u901a\u8baf\u673a\u5236\uff0c\u6709\u52a9\u4e8e\u89e3\u8026\u4ee3\u7801\u548c\u63d0\u9ad8\u590d\u7528\u6027\u3002\u8bbe\u60f3\u4e00\u4e2a\u7528\u6237\u754c\u9762\u7ec4\u4ef6\uff0c\u5b83\u9700\u8981\u901a\u77e5\u5176\u5b83\u90e8\u5206\u67d0\u4e2a\u7279\u5b9a\u64cd\u4f5c\u5df2\u7ecf\u5b8c\u6210\uff0c\u5982\u4e00\u4e2a\u4e0a\u4f20\u6309\u94ae\u53ef\u80fd\u9700\u8981\u544a\u77e5\u5e94\u7528\u4e0a\u4f20\u8fdb\u5ea6\u3002\u901a\u8fc7\u81ea\u5b9a\u4e49\u4e8b\u4ef6\uff0c\u8be5\u7ec4\u4ef6\u80fd\u591f\u53d1\u5e03\u4e00\u4e2a\u5177\u6709\u8fdb\u5ea6\u4fe1\u606f\u7684\u4e8b\u4ef6\uff0c\u800c\u5176\u4ed6\u5173\u6ce8\u8fd9\u4e00\u8fdb\u5ea6\u7684\u7ec4\u4ef6\u6216\u8005\u670d\u52a1\u80fd\u591c\u76d1\u542c\u8fd9\u4e2a\u4e8b\u4ef6\u5e76\u4f5c\u51fa\u76f8\u5e94\u7684\u5904\u7406\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u521b\u5efa\u81ea\u5b9a\u4e49\u4e8b\u4ef6<\/h3>\n<\/p>\n

\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u7684\u521b\u5efa\u901a\u5e38\u901a\u8fc7 CustomEvent<\/code> \u6784\u9020\u51fd\u6570\u5b9e\u73b0\uff0c\u5176\u5141\u8bb8\u6307\u5b9a\u4e8b\u4ef6\u7684\u540d\u79f0\u53ca\u8be6\u60c5\u3002<\/p>\n<\/p>\n

\u521d\u59cb\u5316\u4e8b\u4ef6<\/h4>\n<\/p>\n

\u9996\u5148\u9700\u8981\u901a\u8fc7 new CustomEvent<\/code> \u521b\u5efa\u4e00\u4e2a\u4e8b\u4ef6\u5b9e\u4f8b\u3002\u5728\u521b\u5efa\u5b9e\u4f8b\u65f6\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u4e8b\u4ef6\u7c7b\u578b\u7684\u5b57\u7b26\u4e32\u6807\u8bc6\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a\u53ef\u9009\u7684\u914d\u7f6e\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u53ef\u4ee5\u7528\u6765\u8bbe\u7f6e\u4e8b\u4ef6\u7684\u5c5e\u6027\uff0c\u4f8b\u5982\u662f\u5426\u53ef\u4ee5\u5192\u6ce1\u3001\u662f\u5426\u53ef\u4ee5\u53d6\u6d88\uff0c\u9ed8\u8ba4\u60c5\u5f62\u4e0b\uff0c\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u662f\u4e0d\u5192\u6ce1\u4e14\u4e0d\u53ef\u53d6\u6d88\u7684\u3002<\/p>\n<\/p>\n

let myEvent = new CustomEvent('myCustomEvent', {<\/p>\n
  bubbles: true,<\/p>\n
  cancelable: true,<\/p>\n
  detAI<\/a>l: { message: 'This is a custom event' }<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5b9a\u4e49\u4e8b\u4ef6\u7ec6\u8282<\/h4>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u7247\u6bb5\u4e2d\uff0cdetail<\/code> \u5c5e\u6027\u88ab\u7528\u6765\u4f20\u9012\u81ea\u5b9a\u4e49\u7684\u6570\u636e\u3002\u8fd9\u4e9b\u6570\u636e\u53ef\u4ee5\u5728\u76d1\u542c\u4e8b\u4ef6\u7684\u56de\u8c03\u51fd\u6570\u4e2d\u901a\u8fc7\u4e8b\u4ef6\u5bf9\u8c61\u7684 detail<\/code> \u5c5e\u6027\u8fdb\u884c\u8bbf\u95ee\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u6d3e\u53d1\u4e8b\u4ef6<\/h3>\n<\/p>\n
\u4e00\u65e6\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u88ab\u521b\u5efa\uff0c\u5b83\u9700\u8981\u88ab\u6d3e\u53d1\u5230\u76f8\u5e94\u7684\u5bf9\u8c61\u4e0a\u3002\u5728 JavaScript \u4e2d\uff0c\u4efb\u4f55\u7ee7\u627f\u81ea EventTarget<\/code> \u7684\u5bf9\u8c61\u90fd\u80fd\u591f\u6d3e\u53d1\u4e8b\u4ef6\uff0c\u5305\u62ec DOM \u5143\u7d20\u3001\u6587\u6863\u5bf9\u8c61\uff08document\uff09\u3001\u7a97\u53e3\u5bf9\u8c61\uff08window\uff09\u6216\u8005\u4efb\u4f55\u5176\u4ed6\u7684\u81ea\u5b9a\u4e49\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
\u89e6\u53d1\u4e8b\u4ef6<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u4e00\u4e2a DOM \u5143\u7d20\uff0c\u4f7f\u7528 dispatchEvent<\/code> \u65b9\u6cd5\u6765\u89e6\u53d1\u4e8b\u4ef6\uff1a<\/p>\n<\/p>\n
document.dispatchEvent(myEvent);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6d3e\u53d1\u4e8b\u4ef6\u65f6\uff0c\u5982\u679c\u8be5\u4e8b\u4ef6\u88ab\u914d\u7f6e\u4e3a\u5192\u6ce1\uff0c\u4e14\u6ca1\u6709\u4efb\u4f55\u5bf9\u8c61\u8c03\u7528\u4e8b\u4ef6\u5bf9\u8c61\u7684 stopPropagation<\/code> \u65b9\u6cd5\uff0c\u90a3\u4e48\u6b64\u4e8b\u4ef6\u5c06\u6cbf\u7740DOM\u6811\u5411\u4e0a\u5192\u6ce1\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u76d1\u542c\u4e8b\u4ef6<\/h3>\n<\/p>\n
\u8981\u54cd\u5e94\u81ea\u5b9a\u4e49\u4e8b\u4ef6\uff0c\u9700\u8981\u5728\u76ee\u6807\u5bf9\u8c61\u4e0a\u4e3a\u8be5\u4e8b\u4ef6\u7c7b\u578b\u6dfb\u52a0\u76d1\u542c\u5668\u3002<\/p>\n<\/p>\n
\u6dfb\u52a0\u4e8b\u4ef6\u76d1\u542c\u5668<\/h4>\n<\/p>\n
\u4f7f\u7528 addEventListener<\/code> \u65b9\u6cd5\u53ef\u4ee5\u5c06\u4e00\u4e2a\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u7ed1\u5b9a\u5230\u4e8b\u4ef6\u76ee\u6807\u4e0a\uff1a<\/p>\n<\/p>\n
document.addEventListener('myCustomEvent', function(e) {<\/p>\n
  console.log('Received a custom event with message:', e.detail.message);<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6dfb\u52a0\u76d1\u542c\u5668\u540e\uff0c\u6bcf\u5f53 myCustomEvent<\/code> \u4e8b\u4ef6\u5728\u8be5\u6587\u6863\u5bf9\u8c61\u4e0a\u88ab\u6d3e\u53d1\uff0c\u76f8\u5e94\u7684\u56de\u8c03\u51fd\u6570\u5c31\u4f1a\u88ab\u8c03\u7528\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4e8b\u4ef6\u4f20\u64ad<\/h3>\n<\/p>\n
\u4e8b\u4ef6\u4f20\u64ad\u5305\u62ec\u4e09\u4e2a\u9636\u6bb5\uff1a\u6355\u83b7\u9636\u6bb5\u3001\u76ee\u6807\u9636\u6bb5\u548c\u5192\u6ce1\u9636\u6bb5\u3002\u5192\u6ce1\u610f\u5473\u7740\u4e8b\u4ef6\u4ece\u53d1\u751f\u4e8b\u4ef6\u7684\u5143\u7d20\u5f00\u59cb\uff0c\u9010\u7ea7\u5411\u4e0a\u4f20\u64ad\u81f3DOM\u6811\u4e2d\u7684\u6700\u9ad8\u5c42\u7ea7\u3002<\/p>\n<\/p>\n
\u6355\u83b7\u4e0e\u5192\u6ce1<\/h4>\n<\/p>\n
\u6dfb\u52a0\u4e8b\u4ef6\u76d1\u542c\u5668\u65f6\uff0c\u53ef\u4ee5\u6307\u5b9a\u7b2c\u4e09\u4e2a\u53c2\u6570\u6765\u76d1\u542c\u6307\u5b9a\u9636\u6bb5\uff1a<\/p>\n<\/p>\n
element.addEventListener('myCustomEvent', myFunction, true); \/\/ \u5728\u6355\u83b7\u9636\u6bb5\u8c03\u7528myFunction<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8bbe\u7f6e\u8be5\u53c2\u6570\u4e3a true<\/code> \u65f6\uff0c\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u5728\u6355\u83b7\u9636\u6bb5\u88ab\u8c03\u7528\uff1b\u82e5\u7701\u7565\u6216\u8bbe\u7f6e\u4e3a false<\/code>\uff0c\u5219\u5728\u5192\u6ce1\u9636\u6bb5\u88ab\u8c03\u7528\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u7684\u5b9e\u9645\u5e94\u7528<\/h3>\n<\/p>\n
\u5728\u73b0\u4ee3 Web \u5e94\u7528\u4e2d\uff0c\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u662f\u4e00\u4e2a\u975e\u5e38\u6709\u7528\u7684\u6a21\u5f0f\uff0c\u5b83\u80fd\u591f\u5e2e\u52a9\u5f00\u53d1\u8005\u7f16\u5199\u51fa\u66f4\u52a0\u6e05\u6670\u548c\u6613\u4e8e\u7ef4\u62a4\u7684\u4ee3\u7801\u3002<\/p>\n<\/p>\n
\u7ec4\u4ef6\u95f4\u901a\u4fe1<\/h4>\n<\/p>\n
\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u5e38\u7528\u4e8e\u4e0d\u540c\u7ec4\u4ef6\u6216\u6a21\u5757\u95f4\u7684\u901a\u4fe1\u3002\u5728\u7ec4\u4ef6\u5316\u7684\u524d\u7aef\u6846\u67b6\u4e2d\uff0c\u4f8b\u5982React\u6216Vue\uff0c\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u662f\u7ec4\u4ef6\u6c9f\u901a\u7684\u57fa\u7840\uff0c\u5141\u8bb8\u5b50\u7ec4\u4ef6\u5411\u7236\u7ec4\u4ef6\u53d1\u9001\u6d88\u606f\u800c\u4e0d\u9700\u8981\u76f4\u63a5\u8c03\u7528\u7236\u7ec4\u4ef6\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u573a\u666f\u4e3e\u4f8b<\/h4>\n<\/p>\n
\u6bd4\u5982\u5728\u4e00\u4e2a\u7f51\u9875\u5e94\u7528\u7684\u591a\u4e2a\u4e0d\u540c\u533a\u57df\u9700\u8981\u76f8\u4e92\u901a\u4fe1\u7684\u573a\u666f\uff0c\u4f7f\u7528\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u53ef\u4ee5\u975e\u5e38\u65b9\u4fbf\u5730\u8fdb\u884c\u89e3\u8026\u3002\u4e00\u4e2a\u533a\u57df\u7684\u6309\u94ae\u70b9\u51fb\u53ef\u4ee5\u53d1\u5e03\u4e00\u4e2a\u81ea\u5b9a\u4e49\u4e8b\u4ef6\uff0c\u800c\u5176\u4ed6\u533a\u57df\u53ef\u4ee5\u76d1\u542c\u8fd9\u4e2a\u4e8b\u4ef6\u5e76\u5bf9\u5176\u8fdb\u884c\u54cd\u5e94\uff0c\u65e0\u9700\u4e24\u4e2a\u533a\u57df\u76f4\u63a5\u4e92\u76f8\u5f15\u7528\uff0c\u8fd9\u5927\u5927\u589e\u5f3a\u4e86\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
\u5982\u4f55\u5728 JavaScript \u4e2d\u5b9e\u73b0\u81ea\u5b9a\u4e49\u4e8b\u4ef6\uff1f<\/strong>
\nJavaScript \u4e2d\u7684\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 Event \u5bf9\u8c61\u548c\u76f8\u5173\u7684\u51fd\u6570\u6765\u5b9e\u73b0\u3002\u9996\u5148\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Event \u5bf9\u8c61\u7684\u6784\u9020\u51fd\u6570\u6765\u521b\u5efa\u4e00\u4e2a\u81ea\u5b9a\u4e49\u4e8b\u4ef6\uff0c\u7136\u540e\u4f7f\u7528 dispatchEvent() \u51fd\u6570\u89e6\u53d1\u8fd9\u4e2a\u4e8b\u4ef6\u3002\u53e6\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u901a\u8fc7 addEventListener() \u51fd\u6570\u5c06\u4e00\u4e2a\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u7ed1\u5b9a\u5230\u4e00\u4e2a\u5143\u7d20\u4e0a\uff0c\u5728\u4e8b\u4ef6\u89e6\u53d1\u65f6\u6267\u884c\u6307\u5b9a\u7684\u51fd\u6570\u3002<\/p>\n
\u5982\u4f55\u7ed9\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u4f20\u9012\u6570\u636e\uff1f<\/strong>
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\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u7684\u4f18\u52bf\u6709\u54ea\u4e9b\uff1f<\/strong>
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