{"id":159907,"date":"2024-05-08T13:19:35","date_gmt":"2024-05-08T05:19:35","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/159907.html"},"modified":"2024-05-08T13:19:38","modified_gmt":"2024-05-08T05:19:38","slug":"%e5%89%8d%e7%ab%af-javascript-%e4%bb%a3%e7%a0%81%e4%b8%ad%e7%9a%84%e4%ba%8b%e4%bb%b6%e5%86%92%e6%b3%a1%e4%b8%8e%e6%8d%95%e8%8e%b7%e6%80%8e%e4%b9%88%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/159907.html","title":{"rendered":"\u524d\u7aef JavaScript \u4ee3\u7801\u4e2d\u7684\u4e8b\u4ef6\u5192\u6ce1\u4e0e\u6355\u83b7\u600e\u4e48\u5b9e\u73b0"},"content":{"rendered":"

\"\u524d\u7aef<\/p>\n

\u4e8b\u4ef6\u5192\u6ce1\u4e0e\u6355\u83b7\u662f\u524d\u7aef\u5f00\u53d1\u4e2dJavaScript\u4e8b\u4ef6\u6a21\u578b\u7684\u4e24\u4e2a\u91cd\u8981\u6982\u5ff5\u3002\u4e8b\u4ef6\u5192\u6ce1<\/strong>\u662f\u6307\u4e00\u4e2a\u4e8b\u4ef6\u4ece\u6700\u6df1\u7684\u8282\u70b9\u5f00\u59cb\uff0c\u9010\u7ea7\u5411\u4e0a\u4f20\u9012\u5230\u6700\u5916\u5c42\u8282\u70b9\u7684\u8fc7\u7a0b\u3002\u800c\u4e8b\u4ef6\u6355\u83b7<\/strong>\u5219\u76f8\u53cd\uff0c\u662f\u4ece\u6700\u5916\u5c42\u8282\u70b9\u5f00\u59cb\u6355\u83b7\u4e8b\u4ef6\uff0c\u76f4\u5230\u6700\u5177\u4f53\u7684\u5143\u7d20\u3002\u5728\u524d\u7aef\u5f00\u53d1\u4e2d\uff0c\u6b63\u786e\u7406\u89e3\u548c\u4f7f\u7528\u8fd9\u4e24\u79cd\u673a\u5236\u5bf9\u4e8e\u6784\u5efa\u4ea4\u4e92\u6027\u5f3a\u7684\u7f51\u9875\u5e94\u7528\u81f3\u5173\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e8b\u4ef6\u6355\u83b7\u76d1\u542c\u4e00\u4e2a\u7236\u5143\u7d20\u6765\u51b3\u5b9a\u662f\u5426\u8981\u5904\u7406\u4e00\u4e2a\u4e8b\u4ef6\uff0c\u7136\u540e\u5728\u4e8b\u4ef6\u5192\u6ce1\u9636\u6bb5\u8fdb\u884c\u54cd\u5e94\u6216\u963b\u6b62\u8be5\u4e8b\u4ef6\u8fdb\u4e00\u6b65\u4f20\u64ad\u3002<\/p>\n<\/p>\n

\u4e3a\u4e86\u8be6\u7ec6\u63cf\u8ff0\u8fd9\u4e00\u6982\u5ff5\uff0c\u6211\u4eec\u5c06\u91cd\u70b9\u89e3\u91ca\u4e8b\u4ef6\u5192\u6ce1\u3002\u4e8b\u4ef6\u5192\u6ce1\u5141\u8bb8\u6211\u4eec\u5728\u4e00\u4e2a\u8f83\u9ad8\u5c42\u7ea7\u7684\u7236\u5143\u7d20\u4e0a\u8bbe\u7f6e\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u6765\u5904\u7406\u6765\u81ea\u591a\u4e2a\u5b50\u5143\u7d20\u7684\u4e8b\u4ef6\u3002\u8fd9\u79cd\u673a\u5236\u7b80\u5316\u4e86\u4e8b\u4ef6\u7ba1\u7406\uff0c\u53ef\u4ee5\u51cf\u5c11\u5bf9DOM\u7684\u64cd\u4f5c\uff0c\u63d0\u5347\u6027\u80fd\u548c\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4e8b\u4ef6\u6a21\u578b\u6982\u8ff0<\/strong><\/h2>\n<\/p>\n

\u4e8b\u4ef6\u5192\u6ce1\u4e0e\u6355\u83b7\u673a\u5236\u662fDOM\u4e8b\u4ef6\u6d41\u7684\u4e24\u4e2a\u9636\u6bb5\u3002DOM\u4e8b\u4ef6\u6d41\u63cf\u8ff0\u4e86\u4ece\u6d4f\u89c8\u5668\u6355\u83b7\u4e8b\u4ef6\u76f4\u5230\u4e8b\u4ef6\u4f20\u64ad\u7ed3\u675f\u7684\u6574\u4e2a\u8fc7\u7a0b\uff0c\u4e3b\u8981\u5305\u62ec\u4e09\u4e2a\u9636\u6bb5\uff1a\u4e8b\u4ef6\u6355\u83b7\u9636\u6bb5\u3001\u76ee\u6807\u9636\u6bb5\u548c\u4e8b\u4ef6\u5192\u6ce1\u9636\u6bb5\u3002<\/p>\n<\/p>\n

\u4e8b\u4ef6\u6355\u83b7\u9636\u6bb5<\/h3>\n<\/p>\n

\u4e8b\u4ef6\u6355\u83b7\u9636\u6bb5\u662f\u6307\u4e8b\u4ef6\u4eceDOM\u6811\u7684\u6839\u8282\u70b9\u5f00\u59cb\uff0c\u9010\u7ea7\u5411\u4e0b\u4f20\u9012\u81f3\u76ee\u6807\u5143\u7d20\u7684\u8fc7\u7a0b\u3002\u5b83\u7684\u76ee\u7684\u662f\u66f4\u65e9\u7684\u63a5\u89e6\u4e8b\u4ef6\uff0c\u4ee5\u4fbf\u5728\u5b83\u5230\u8fbe\u76ee\u6807\u4e4b\u524d\u5c31\u80fd\u505a\u51fa\u5904\u7406\u3002<\/p>\n<\/p>\n

\u4e8b\u4ef6\u5192\u6ce1\u9636\u6bb5<\/h3>\n<\/p>\n

\u4e8b\u4ef6\u5192\u6ce1\u9636\u6bb5\u4ece\u76ee\u6807\u5143\u7d20\u5f00\u59cb\uff0c\u9010\u7ea7\u5411\u4e0a\u56de\u6eaf\u81f3DOM\u6811\u7684\u6839\u8282\u70b9\u3002\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u7236\u5143\u7d20\u4f1a\u4e00\u4e2a\u63a5\u4e00\u4e2a\u5730\u6709\u673a\u4f1a\u5904\u7406\u4e8b\u4ef6\u3002<\/p>\n<\/p>\n

\u4e8c\u3001\u5b9e\u73b0\u4e8b\u4ef6\u6355\u83b7\u4e0e\u5192\u6ce1<\/strong><\/h2>\n<\/p>\n

\u5728JavaScript\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528addEventListener<\/code>\u65b9\u6cd5\u6765\u4e3a\u5143\u7d20\u6dfb\u52a0\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\uff0c\u5e76\u901a\u8fc7\u8be5\u65b9\u6cd5\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\u6765\u6307\u5b9a\u76d1\u542c\u51fd\u6570\u662f\u5728\u6355\u83b7\u9636\u6bb5\u8c03\u7528\u8fd8\u662f\u5728\u5192\u6ce1\u9636\u6bb5\u8c03\u7528\u3002<\/p>\n<\/p>\n

\u4f7f\u7528addEventListener\u76d1\u542c\u4e8b\u4ef6<\/h3>\n<\/p>\n

\u8981\u5728JavaScript\u4e2d\u76d1\u542c\u4e8b\u4ef6\uff0c\u4e00\u822c\u505a\u6cd5\u662f\u4f7f\u7528addEventListener<\/code>\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u8981\u4e3a\u4e00\u4e2a\u6309\u94ae\u5143\u7d20\u6dfb\u52a0\u70b9\u51fb\u4e8b\u4ef6\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a<\/p>\n<\/p>\n

const button = document.getElementById('myButton');<\/p>\n
button.addEventListener('click', function(event) {<\/p>\n
    console.log('Button clicked!');<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6307\u5b9a\u4e8b\u4ef6\u6355\u83b7\u6216\u5192\u6ce1<\/h3>\n<\/p>\n
addEventListener<\/code>\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\u51b3\u5b9a\u4e86\u662f\u5728\u6355\u83b7\u9636\u6bb5\u8fd8\u662f\u5192\u6ce1\u9636\u6bb5\u6267\u884c\u3002\u5982\u679c\u53c2\u6570\u4e3atrue<\/code>\uff0c\u5219\u5728\u6355\u83b7\u9636\u6bb5\u6267\u884c\uff1b\u5982\u679c\u53c2\u6570\u4e3afalse<\/code>\u6216\u4e0d\u63d0\u4f9b\u8fd9\u4e2a\u53c2\u6570\uff08\u9ed8\u8ba4\u503c\uff09\uff0c\u5219\u5728\u5192\u6ce1\u9636\u6bb5\u6267\u884c\u3002<\/p>\n<\/p>\n
const parent = document.getElementById('parent');<\/p>\n
const child = document.getElementById('child');<\/p>\n
\/\/ \u5728\u6355\u83b7\u9636\u6bb5\u6267\u884c<\/p>\n
parent.addEventListener('click', function(event) {<\/p>\n
    console.log('Parent captured!');<\/p>\n
}, true);<\/p>\n
\/\/ \u5728\u5192\u6ce1\u9636\u6bb5\u6267\u884c<\/p>\n
child.addEventListener('click', function(event) {<\/p>\n
    console.log('Child bubbled!');<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u4e8b\u4ef6\u5904\u7406\u673a\u5236<\/strong><\/h2>\n<\/p>\n
\u7406\u89e3\u4e8b\u4ef6\u5904\u7406\u673a\u5236\u5bf9\u4e8e\u6709\u6548\u4f7f\u7528\u4e8b\u4ef6\u5192\u6ce1\u548c\u6355\u83b7\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<\/p>\n
\u4e8b\u4ef6\u5bf9\u8c61<\/h3>\n<\/p>\n
\u5f53\u4e00\u4e2a\u4e8b\u4ef6\u53d1\u751f\u65f6\uff0c\u6d4f\u89c8\u5668\u4f1a\u521b\u5efa\u4e00\u4e2a\u4e8b\u4ef6\u5bf9\u8c61\uff0c\u5b83\u5305\u542b\u6709\u5173\u4e8b\u4ef6\u7684\u4fe1\u606f\uff0c\u5982\u4e8b\u4ef6\u7c7b\u578b\u3001\u53d1\u751f\u4e8b\u4ef6\u7684\u76ee\u6807\u5143\u7d20\u3001\u4e8b\u4ef6\u662f\u5426\u53ef\u5192\u6ce1\u7b49\u3002\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u53ef\u4ee5\u8bbf\u95ee\u5e76\u4f7f\u7528\u8fd9\u4e2a\u4e8b\u4ef6\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
\u963b\u6b62\u9ed8\u8ba4\u884c\u4e3a<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u963b\u6b62\u4e8b\u4ef6\u7684\u9ed8\u8ba4\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u5f53\u70b9\u51fb\u63d0\u4ea4\u6309\u94ae\u65f6\uff0c\u963b\u6b62\u8868\u5355\u7684\u9ed8\u8ba4\u63d0\u4ea4\u884c\u4e3a\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528event.preventDefault()<\/code>\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
const form = document.getElementById('myForm');<\/p>\n
form.addEventListener('submit', function(event) {<\/p>\n
    event.preventDefault();<\/p>\n
    console.log('Form submission prevented.');<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u963b\u6b62\u4e8b\u4ef6\u8fdb\u4e00\u6b65\u4f20\u64ad<\/h3>\n<\/p>\n
\u6709\u65f6\u5019\u4f60\u53ef\u80fd\u4e0d\u5e0c\u671b\u4e8b\u4ef6\u7ee7\u7eed\u5192\u6ce1\u6216\u6355\u83b7\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528event.stopPropagation()<\/code>\u65b9\u6cd5\u6765\u505c\u6b62\u4e8b\u4ef6\u4f20\u64ad\u3002<\/p>\n<\/p>\n
child.addEventListener('click', function(event) {<\/p>\n
    console.log('Child clicked! Stopping propagation.');<\/p>\n
    event.stopPropagation();<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u4e8b\u4ef6\u59d4\u6258<\/strong><\/h2>\n<\/p>\n
\u4e8b\u4ef6\u5192\u6ce1\u7684\u4e00\u4e2a\u6709\u7528\u7279\u6027\u662f\u53ef\u4ee5\u5b9e\u73b0\u4e8b\u4ef6\u59d4\u6258\uff0c\u5373\u5728\u4e00\u4e2a\u5171\u540c\u7684\u7956\u5148\u5143\u7d20\u4e0a\u8bbe\u7f6e\u76d1\u542c\u5668\u6765\u7ba1\u7406\u7c7b\u578b\u76f8\u540c\u7684\u591a\u4e2a\u4e8b\u4ef6\u3002<\/p>\n<\/p>\n
\u4e8b\u4ef6\u59d4\u6258\u7684\u597d\u5904<\/h3>\n<\/p>\n
\u4e8b\u4ef6\u59d4\u6258\u4e0d\u4ec5\u7b80\u5316\u4e86\u4e8b\u4ef6\u7ba1\u7406\uff0c\u51cf\u5c11\u4e86\u5bf9DOM\u7684\u64cd\u4f5c\u6b21\u6570\uff0c\u8fd8\u80fd\u63d0\u9ad8\u6027\u80fd\u3002\u5f53\u6709\u5927\u91cf\u5143\u7d20\u9700\u8981\u76f8\u540c\u7684\u4e8b\u4ef6\u5904\u7406\u65f6\uff0c\u800c\u8fd9\u4e9b\u5143\u7d20\u53c8\u9891\u7e41\u5730\u88ab\u6dfb\u52a0\u6216\u5220\u9664\uff0c\u91c7\u7528\u4e8b\u4ef6\u59d4\u6258\u53ef\u4ee5\u907f\u514d\u91cd\u590d\u7ed1\u5b9a\u548c\u89e3\u7ed1\u5b9a\u4e8b\u4ef6\u76d1\u542c\u5668\u3002<\/p>\n<\/p>\n
\u5b9e\u73b0\u4e8b\u4ef6\u59d4\u6258<\/h3>\n<\/p>\n
\u4f60\u53ef\u4ee5\u68c0\u67e5event.target<\/code>\u5c5e\u6027\uff0c\u4ee5\u786e\u5b9a\u54ea\u4e2a\u5b50\u5143\u7d20\u89e6\u53d1\u4e86\u4e8b\u4ef6\uff0c\u5e76\u76f8\u5e94\u5730\u5904\u7406\u3002<\/p>\n<\/p>\n
const list = document.getElementById('myList');<\/p>\n
list.addEventListener('click', function(event) {<\/p>\n
    if(event.target.tagName === 'LI') {<\/p>\n
        console.log('List item clicked:', event.target.textContent);<\/p>\n
    }<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528\u4e8b\u4ef6\u5192\u6ce1\u548c\u6355\u83b7\u80fd\u591f\u4f7f\u524d\u7aef\u5f00\u53d1\u5de5\u4f5c\u53d8\u5f97\u66f4\u52a0\u9ad8\u6548\u548c\u6709\u5e8f\u3002\u638c\u63e1\u8fd9\u4e9b\u6982\u5ff5\u4ee5\u53ca\u76f8\u5173\u7684JavaScript API\u662f\u4efb\u4f55\u524d\u7aef\u5f00\u53d1\u8005\u7684\u5fc5\u5907\u6280\u80fd\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
\u5982\u4f55\u5728\u524d\u7aef JavaScript \u4ee3\u7801\u4e2d\u5b9e\u73b0\u4e8b\u4ef6\u5192\u6ce1\uff1f<\/strong><\/p>\n
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