{"id":258435,"date":"2024-05-15T12:38:56","date_gmt":"2024-05-15T04:38:56","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/258435.html"},"modified":"2024-05-15T12:39:02","modified_gmt":"2024-05-15T04:39:02","slug":"%e5%89%8d%e7%ab%af-javascript-%e4%bb%a3%e7%a0%81%e5%a6%82%e4%bd%95%e5%8f%96%e6%b6%88%e7%82%b9%e5%87%bb%e4%ba%8b%e4%bb%b6-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/258435.html","title":{"rendered":"\u524d\u7aef javascript \u4ee3\u7801\u5982\u4f55\u53d6\u6d88\u70b9\u51fb\u4e8b\u4ef6"},"content":{"rendered":"

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

JavaScript\u4e2d\u53d6\u6d88\u70b9\u51fb\u4e8b\u4ef6\u7684\u65b9\u6cd5\u901a\u5e38\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a\u89e3\u7ed1\u4e8b\u4ef6\u76d1\u542c\u5668\u3001\u4f7f\u7528\u4e8b\u4ef6\u5bf9\u8c61\u7684stopPropagation\u65b9\u6cd5\u3001\u8bbe\u7f6e\u6761\u4ef6\u5224\u65ad<\/strong>\u3002\u89e3\u7ed1\u4e8b\u4ef6\u76d1\u542c\u5668\u662f\u6700\u76f4\u63a5\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u901a\u8fc7removeEventListener<\/code>\u51fd\u6570\u6765\u5b9e\u73b0\uff0c\u5b83\u53ef\u4ee5\u5220\u9664\u901a\u8fc7addEventListener<\/code>\u51fd\u6570\u6dfb\u52a0\u7684\u4e8b\u4ef6\u76d1\u542c\u5668\u3002\u5f53\u4f60\u4e0d\u518d\u5e0c\u671b\u67d0\u4e2a\u5143\u7d20\u54cd\u5e94\u70b9\u51fb\u4e8b\u4ef6\u65f6\uff0c\u901a\u8fc7\u8c03\u7528\u8be5\u65b9\u6cd5\u5e76\u4f20\u9012\u76f8\u540c\u7684\u53c2\u6570\uff0c\u53ef\u4ee5\u53d6\u6d88\u8be5\u5143\u7d20\u7684\u70b9\u51fb\u4e8b\u4ef6\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528REMOVEEVENTLISTENER\u65b9\u6cd5<\/h3>\n<\/p>\n

\u8981\u53d6\u6d88\u4e00\u4e2a\u901a\u8fc7addEventListener<\/code>\u6dfb\u52a0\u7684\u4e8b\u4ef6\uff0c\u4f60\u9700\u8981\u5bf9\u7167\u5b83\u7684\u6dfb\u52a0\u65b9\u5f0f\uff0c\u5c06\u76f8\u540c\u7684\u76d1\u542c\u51fd\u6570\u548c\u4e8b\u4ef6\u7c7b\u578b\u4f20\u9012\u7ed9removeEventListener<\/code>\u65b9\u6cd5\u3002\u8fd9\u610f\u5473\u7740\u76d1\u542c\u51fd\u6570\u5fc5\u987b\u662f\u4e00\u4e2a\u547d\u540d\u51fd\u6570\u6216\u8005\u4e00\u4e2a\u53ef\u5f15\u7528\u7684\u51fd\u6570\u8868\u8fbe\u5f0f\u3002<\/p>\n<\/p>\n

\u793a\u4f8b\uff1a<\/strong><\/p>\n<\/p>\n

\/\/ \u7ed1\u5b9a\u70b9\u51fb\u4e8b\u4ef6<\/p>\n
var btn = document.getElementById('myButton');<\/p>\n
btn.addEventListener('click', myFunction);<\/p>\n
\/\/ \u53d6\u6d88\u70b9\u51fb\u4e8b\u4ef6<\/p>\n
btn.removeEventListener('click', myFunction);<\/p>\n
function myFunction() {<\/p>\n
  console.log('Button clicked!');<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u7136\u800c\uff0c\u8fd9\u91cc\u6709\u4e2a\u6ce8\u610f\u70b9\uff0c\u5982\u679c\u4f60\u5728\u6dfb\u52a0\u76d1\u542c\u5668\u65f6\u4f7f\u7528\u4e86\u533f\u540d\u51fd\u6570\uff0c\u90a3\u4e48\u4f60\u5c31\u65e0\u6cd5\u76f4\u63a5\u89e3\u7ed1\u8fd9\u4e2a\u4e8b\u4ef6\u3002\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528\u547d\u540d\u51fd\u6570\u3002<\/p>\n<\/p>\n
\u89e3\u51b3\u533f\u540d\u51fd\u6570\u7684\u95ee\u9898\uff1a<\/strong><\/p>\n<\/p>\n
\/\/ \u7ed1\u5b9a\u70b9\u51fb\u4e8b\u4ef6<\/p>\n
var btn = document.getElementById('myButton');<\/p>\n
btn.addEventListener('click', function clickEvent() {<\/p>\n
  console.log('Button clicked!');<\/p>\n
});<\/p>\n
\/\/ \u82e5\u8981\u53d6\u6d88\uff0c\u5fc5\u987b\u5bf9\u539f\u59cb\u51fd\u6570\u6709\u5f15\u7528<\/p>\n
\/\/ btn.removeEventListener('click', clickEvent); \/\/ \u8fd9\u5c06\u4e0d\u4f1a\u5de5\u4f5c\uff0c\u56e0\u4e3aclickEvent\u5728\u8fd9\u91cc\u4e0d\u53ef\u7528<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e3a\u4e86\u89c4\u907f\u8fd9\u4e2a\u95ee\u9898\uff0c\u901a\u5e38\u4f1a\u9996\u5148\u58f0\u660e\u4e00\u4e2a\u547d\u540d\u51fd\u6570\uff0c\u7136\u540e\u5728addEventListener<\/code>\u548cremoveEventListener<\/code>\u65f6\u4f7f\u7528\u8fd9\u4e2a\u51fd\u6570\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528STOPPROPAGATION\u65b9\u6cd5<\/h3>\n<\/p>\n
\u6709\u65f6\u5019\u4f60\u5e76\u4e0d\u60f3\u5b8c\u5168\u79fb\u9664\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u800c\u662f\u5e0c\u671b\u5728\u67d0\u4e9b\u6761\u4ef6\u4e0b\u4e34\u65f6\u963b\u6b62\u4e8b\u4ef6\u7684\u8fdb\u4e00\u6b65\u4f20\u64ad\u3002\u5728\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e2d\uff0c\u4f60\u53ef\u4ee5\u8c03\u7528\u4e8b\u4ef6\u5bf9\u8c61\u7684stopPropagation<\/code>\u51fd\u6570\u6765\u963b\u6b62\u4e8b\u4ef6\u5192\u6ce1\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/strong><\/p>\n<\/p>\n
function myFunction(event) {<\/p>\n
  event.stopPropagation();<\/p>\n
  console.log('Event propagation stopped');<\/p>\n
}<\/p>\n
var btn = document.getElementById('myButton');<\/p>\n
btn.addEventListener('click', myFunction);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6b64\u65b9\u6cd5\u9002\u7528\u4e8e\u590d\u6742\u7684\u4e8b\u4ef6\u59d4\u6258\u60c5\u51b5\uff0c\u4f8b\u5982\u5f53\u7236\u5143\u7d20\u4e0a\u7ed1\u5b9a\u4e86\u4e8b\u4ef6\uff0c\u4f46\u4f60\u5e0c\u671b\u5728\u7279\u5b9a\u5b50\u5143\u7d20\u4e0a\u963b\u6b62\u8fd9\u4e2a\u4e8b\u4ef6\u65f6\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u901a\u8fc7CONDITIONAL\u903b\u8f91\u53d6\u6d88\u4e8b\u4ef6<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u5f62\u4e0b\uff0c\u4f60\u53ef\u80fd\u5e0c\u671b\u4fdd\u7559\u4e8b\u4ef6\u76d1\u542c\uff0c\u4f46\u6839\u636e\u7279\u5b9a\u7684\u6761\u4ef6\u51b3\u5b9a\u662f\u5426\u54cd\u5e94\u4e8b\u4ef6\u3002\u8fd9\u79cd\u65b9\u6cd5\u662f\u5728\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e2d\u5305\u542b\u6761\u4ef6\u5224\u65ad\u903b\u8f91\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/strong><\/p>\n<\/p>\n
btn.addEventListener('click', function(event) {<\/p>\n
  if (shouldIgnoreClick(event)) {<\/p>\n
    console.log('Click ignored');<\/p>\n
    return;<\/p>\n
  }<\/p>\n
  console.log('Click processed');<\/p>\n
});<\/p>\n
function shouldIgnoreClick(event) {<\/p>\n
  \/\/ \u4f60\u7684\u903b\u8f91\uff0c\u8fd4\u56detrue\u6216false<\/p>\n
  return event.target.tagName === 'BUTTON' && event.target.disabled;<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u88ab\u7528\u4e8e\u7075\u6d3b\u5730\u5904\u7406\u4e8b\u4ef6\uff0c\u5728\u5904\u7406\u51fd\u6570\u4e2d\u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u7684\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u903b\u8f91\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528FLAGS\u6765\u53d6\u6d88\u4e8b\u4ef6<\/h3>\n<\/p>\n
\u53e6\u4e00\u4e2a\u53d6\u6d88\u4e8b\u4ef6\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u4e00\u4e2a\u6807\u5fd7\uff08flag\uff09\uff0c\u8fd9\u4e2a\u6807\u5fd7\u51b3\u5b9a\u4e8b\u4ef6\u662f\u5426\u5e94\u8be5\u88ab\u5904\u7406\u3002\u6b64\u65b9\u6cd5\u7c7b\u4f3c\u4e8e\u6761\u4ef6\u903b\u8f91\u65b9\u6cd5\uff0c\u4f46\u662f\u901a\u8fc7\u4e00\u4e2a\u6807\u5fd7\u53d8\u91cf\u6765\u63a7\u5236\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/strong><\/p>\n<\/p>\n
var eventEnabled = true;<\/p>\n
btn.addEventListener('click', function(event) {<\/p>\n
  if (!eventEnabled) {<\/p>\n
    console.log('Click is currently disabled');<\/p>\n
    return;<\/p>\n
  }<\/p>\n
  console.log('Click action performed');<\/p>\n
});<\/p>\n
\/\/ \u7981\u7528\u4e8b\u4ef6<\/p>\n
function disableClicks() {<\/p>\n
  eventEnabled = false;<\/p>\n
}<\/p>\n
\/\/ \u542f\u7528\u4e8b\u4ef6<\/p>\n
function enableClicks() {<\/p>\n
  eventEnabled = true;<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528\u6807\u5fd7\u53ef\u4ee5\u8ba9\u4f60\u5728\u7a0b\u5e8f\u7684\u5176\u4ed6\u90e8\u5206\u542f\u7528\u6216\u7981\u7528\u4e8b\u4ef6\uff0c\u800c\u4e0d\u5fc5\u76f4\u63a5\u64cd\u4f5c\u4e8b\u4ef6\u76d1\u542c\u5668\u672c\u8eab\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u53d6\u6d88\u524d\u7aefJavaScript\u4e2d\u7684\u70b9\u51fb\u4e8b\u4ef6\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff0c\u5305\u62ec\u89e3\u7ed1\u4e8b\u4ef6\u76d1\u542c\u5668\u3001\u4f7f\u7528\u4e8b\u4ef6\u7684stopPropagation<\/code>\u3001\u6761\u4ef6\u5224\u65ad\u903b\u8f91\u4ee5\u53ca\u6807\u5fd7\u53d8\u91cf\u3002\u9009\u62e9\u54ea\u79cd\u65b9\u5f0f\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u548c\u9700\u6c42\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u7ec4\u5408\u4f7f\u7528\uff0c\u4ee5\u5b9e\u73b0\u66f4\u9ad8\u7ea7\u7684\u4e8b\u4ef6\u63a7\u5236\u7b56\u7565\u3002<\/p>\n<\/p>\n
\u4f5c\u4e3a\u6700\u4f73\u5b9e\u8df5\uff0c\u5e94\u8be5\u59cb\u7ec8\u6ce8\u610f\u7ba1\u7406\u597d\u4f60\u7684\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u6e05\u6670\u5730\u6ce8\u660e\u4e8b\u4ef6\u7684\u6dfb\u52a0\u548c\u79fb\u9664\u673a\u5236\uff0c\u907f\u514d\u53ef\u80fd\u7684\u5185\u5b58\u6cc4\u6f0f\u53ca\u5176\u4ed6\u610f\u5916\u884c\u4e3a\u3002\u8fd9\u6837\u505a\u4e0d\u4ec5\u80fd\u63d0\u9ad8\u5e94\u7528\u7684\u6027\u80fd\uff0c\u4e5f\u80fd\u964d\u4f4e\u7ef4\u62a4\u7684\u590d\u6742\u5ea6\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
\u5982\u4f55\u53d6\u6d88\u524d\u7aef JavaScript \u4ee3\u7801\u4e2d\u7684\u70b9\u51fb\u4e8b\u4ef6\uff1f<\/strong><\/p>\n
    \n
  1. \u5982\u4f55\u901a\u8fc7 JavaScript \u53d6\u6d88\u5143\u7d20\u7684\u70b9\u51fb\u4e8b\u4ef6\uff1f<\/strong><\/li>\n<\/ol>\n
    \u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 removeEventListener<\/code> \u65b9\u6cd5\u6765\u53d6\u6d88\u5143\u7d20\u7684\u70b9\u51fb\u4e8b\u4ef6\u3002\u9996\u5148\uff0c\u4f7f\u7528 querySelector<\/code> \u6216\u8005\u5176\u4ed6\u65b9\u6cd5\u83b7\u53d6\u5230\u8981\u53d6\u6d88\u70b9\u51fb\u4e8b\u4ef6\u7684\u5143\u7d20\uff0c\u7136\u540e\u901a\u8fc7 addEventListener<\/code> \u65b9\u6cd5\u7ed9\u5143\u7d20\u6dfb\u52a0\u70b9\u51fb\u4e8b\u4ef6\uff0c\u4e4b\u540e\u518d\u901a\u8fc7 removeEventListener<\/code> \u65b9\u6cd5\u53d6\u6d88\u70b9\u51fb\u4e8b\u4ef6\u3002<\/p>\n
    \/\/ \u83b7\u53d6\u8981\u53d6\u6d88\u70b9\u51fb\u4e8b\u4ef6\u7684\u5143\u7d20\nlet element = document.querySelector('.element-class');\n\n\/\/ \u6dfb\u52a0\u70b9\u51fb\u4e8b\u4ef6\nfunction clickHandler() {\n  console.log('\u70b9\u51fb\u4e8b\u4ef6\u89e6\u53d1\u4e86\uff01');\n}\n\nelement.addEventListener('click', clickHandler);\n\n\/\/ \u53d6\u6d88\u70b9\u51fb\u4e8b\u4ef6\nelement.removeEventListener('click', clickHandler);\n<\/code><\/pre>\n
      \n
    1. \u5982\u4f55\u901a\u8fc7 JavaScript \u53d6\u6d88\u9875\u9762\u7684\u6240\u6709\u70b9\u51fb\u4e8b\u4ef6\uff1f<\/strong><\/li>\n<\/ol>\n
      \u8981\u53d6\u6d88\u9875\u9762\u7684\u6240\u6709\u70b9\u51fb\u4e8b\u4ef6\uff0c\u53ef\u4ee5\u4f7f\u7528 document<\/code> \u5bf9\u8c61\u6765\u64cd\u4f5c\uff0c\u5c06\u70b9\u51fb\u4e8b\u4ef6\u4ece document<\/code> \u5bf9\u8c61\u4e0a\u79fb\u9664\u3002<\/p>\n
      function clickHandler() {\n  console.log('\u70b9\u51fb\u4e8b\u4ef6\u89e6\u53d1\u4e86\uff01');\n}\n\n\/\/ \u6dfb\u52a0\u70b9\u51fb\u4e8b\u4ef6\ndocument.addEventListener('click', clickHandler);\n\n\/\/ \u53d6\u6d88\u6240\u6709\u70b9\u51fb\u4e8b\u4ef6\ndocument.removeEventListener('click', clickHandler);\n<\/code><\/pre>\n
        \n
      1. \u5982\u4f55\u5728 JavaScript \u4e2d\u963b\u6b62\u5143\u7d20\u7684\u9ed8\u8ba4\u70b9\u51fb\u884c\u4e3a\uff1f<\/strong><\/li>\n<\/ol>\n
        \u6709\u65f6\u5019\u6211\u4eec\u60f3\u53d6\u6d88\u5143\u7d20\u7684\u9ed8\u8ba4\u70b9\u51fb\u884c\u4e3a\uff0c\u4f8b\u5982\u963b\u6b62\u94fe\u63a5\u8df3\u8f6c\u6216\u8005\u6309\u94ae\u63d0\u4ea4\u7b49\u3002\u53ef\u4ee5\u901a\u8fc7\u5728\u70b9\u51fb\u4e8b\u4ef6\u7684\u5904\u7406\u51fd\u6570\u4e2d\u4f7f\u7528 event.preventDefault()<\/code> \u65b9\u6cd5\u6765\u963b\u6b62\u9ed8\u8ba4\u884c\u4e3a\u3002<\/p>\n
        let link = document.querySelector('a');\n\n\/\/ \u963b\u6b62\u94fe\u63a5\u8df3\u8f6c\nlink.addEventListener('click', function(event) {\n  event.preventDefault();\n});\n<\/code><\/pre>\n
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