{"id":259534,"date":"2024-05-15T13:09:09","date_gmt":"2024-05-15T05:09:09","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/259534.html"},"modified":"2024-05-15T13:09:16","modified_gmt":"2024-05-15T05:09:16","slug":"javascript-%e4%bb%a3%e7%a0%81%e5%a6%82%e4%bd%95%e7%bb%99%e5%af%b9%e8%b1%a1%e4%bf%ae%e6%94%b9%e6%b3%a8%e5%86%8c%e7%9b%91%e5%90%ac%e5%99%a8-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/259534.html","title":{"rendered":"JavaScript \u4ee3\u7801\u5982\u4f55\u7ed9\u5bf9\u8c61\u4fee\u6539\u6ce8\u518c\u76d1\u542c\u5668"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27110917\/d115407b-a08f-4a64-8ed5-0cdc1410e117.webp\" alt=\"JavaScript \u4ee3\u7801\u5982\u4f55\u7ed9\u5bf9\u8c61\u4fee\u6539\u6ce8\u518c\u76d1\u542c\u5668\" \/><\/p>\n<p><p>JavaScript\u4e2d\u7ed9\u5bf9\u8c61\u4fee\u6539\u6ce8\u518c\u76d1\u542c\u5668\u4e3b\u8981\u6d89\u53ca\u5230\u4e09\u4e2a\u64cd\u4f5c\uff1a<strong>\u6dfb\u52a0\u76d1\u542c\u5668\u3001\u79fb\u9664\u76d1\u542c\u5668\u3001\u4ee5\u53ca\u76d1\u542c\u5668\u7684\u5904\u7406\u51fd\u6570<\/strong>\u3002\u8fd9\u4e9b\u64cd\u4f5c\u901a\u5e38\u4f7f\u7528\u6807\u51c6\u7684\u65b9\u6cd5\uff0c\u5982<code>addEventListener<\/code>\u548c<code>removeEventListener<\/code>\u3002\u7279\u522b\u662f\u5728\u5904\u7406DOM\u5143\u7d20\u65f6\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u662f\u975e\u5e38\u5e38\u89c1\u7684\u3002\u5bf9\u4e8e\u67d0\u4e9b\u7279\u5b9a\u5bf9\u8c61\uff0c\u8fd8\u53ef\u80fd\u9700\u8981\u4f7f\u7528\u7279\u5b9a\u7684API\u6216\u6a21\u5f0f\u3002<\/p>\n<\/p>\n<p><p>\u5728\u8fdb\u884c\u5177\u4f53\u63cf\u8ff0\u4e4b\u524d\uff0c\u5148\u4ece\u6838\u5fc3\u89c2\u70b9\u5c55\u5f00\u3002<strong>\u6dfb\u52a0\u76d1\u542c\u5668<\/strong>\u901a\u5e38\u662f\u901a\u8fc7\u8c03\u7528\u5bf9\u8c61\u4e0a\u7684<code>addEventListener<\/code>\u65b9\u6cd5\u5b9e\u73b0\u7684\uff0c\u8be5\u65b9\u6cd5\u81f3\u5c11\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u4e00\u4e2a\u662f\u4e8b\u4ef6\u7c7b\u578b\u7684\u5b57\u7b26\u4e32\uff08\u5982&quot;click&quot;\u3001&quot;change&quot;\u7b49\uff09\uff0c\u53e6\u4e00\u4e2a\u662f\u5f53\u4e8b\u4ef6\u53d1\u751f\u65f6\u5c06\u88ab\u8c03\u7528\u7684\u56de\u8c03\u51fd\u6570\u3002\u4e3a\u4e86\u5141\u8bb8\u540e\u7eed\u53ef\u4ee5\u79fb\u9664\u76d1\u542c\u5668\uff0c\u901a\u5e38\u9700\u8981\u4fdd\u6301\u5bf9\u76d1\u542c\u5668\u56de\u8c03\u51fd\u6570\u7684\u5f15\u7528\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u6dfb\u52a0\u76d1\u542c\u5668<\/h3>\n<\/p>\n<p><p>\u76d1\u542c\u5668\u7684\u6dfb\u52a0\u662f\u4f7f\u5f97JavaScript\u4ee3\u7801\u80fd\u591f\u54cd\u5e94\u7279\u5b9a\u4e8b\u4ef6\u7684\u57fa\u7840\u3002\u5728Web\u5e94\u7528\u5f00\u53d1\u4e2d\uff0c\u6bd4\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u60f3\u8981\u76d1\u542c\u4e00\u4e2a\u6309\u94ae\u7684\u70b9\u51fb\u4e8b\u4ef6\u6216\u4e00\u4e2a\u8f93\u5165\u6846\u7684\u503c\u53d8\u5316\u4e8b\u4ef6\u3002<\/p>\n<\/p>\n<p><p><strong>1. \u4f7f\u7528<code>addEventListener<\/code><\/strong><\/p>\n<\/p>\n<p><p>\u8981\u4e3a\u4e00\u4e2a\u5bf9\u8c61\u6dfb\u52a0\u4e00\u4e2a\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<code>addEventListener<\/code>\u65b9\u6cd5\u3002\u8fd9\u4e2a\u65b9\u6cd5\u63a5\u53d7\u81f3\u5c11\u4e24\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8981\u76d1\u542c\u7684\u4e8b\u4ef6\u7c7b\u578b\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u5f53\u4e8b\u4ef6\u53d1\u751f\u65f6\u6240\u8c03\u7528\u7684\u51fd\u6570\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">const button = document.querySelector(&#039;#myButton&#039;);<\/p>\n<p>button.addEventListener(&#039;click&#039;, function(event) {<\/p>\n<p>    \/\/ \u6b64\u5904\u7f16\u5199\u5f53\u6309\u94ae\u88ab\u70b9\u51fb\u65f6\u6267\u884c\u7684\u4ee3\u7801<\/p>\n<p>});<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5f53\u6309\u94ae\u88ab\u70b9\u51fb\u65f6\uff0c\u4f1a\u6267\u884c\u4f20\u9012\u7ed9<code>addEventListener<\/code>\u7684\u533f\u540d\u51fd\u6570\u3002<\/p>\n<\/p>\n<p><p><strong>2. \u5173\u4e8e\u4e8b\u4ef6\u5904\u7406\u5668\u7684\u5199\u6cd5<\/strong><\/p>\n<\/p>\n<p><p>\u4e8b\u4ef6\u5904\u7406\u5668\u53ef\u4ee5\u662f\u4e00\u4e2a\u533f\u540d\u51fd\u6570\uff0c\u4e5f\u53ef\u4ee5\u662f\u4e00\u4e2a\u540d\u4e3a\u51fd\u6570\u6216\u7bad\u5934\u51fd\u6570\u3002\u5982\u679c\u4f60\u6253\u7b97\u5728\u672a\u6765\u79fb\u9664\u76d1\u542c\u5668\uff0c\u6700\u597d\u4f7f\u7528\u547d\u540d\u51fd\u6570\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">function handleClick(event) {<\/p>\n<p>    \/\/ \u5904\u7406\u70b9\u51fb\u4e8b\u4ef6<\/p>\n<p>}<\/p>\n<p>button.addEventListener(&#039;click&#039;, handleClick);<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u901a\u8fc7\u4f7f\u7528\u547d\u540d\u51fd\u6570\uff0c\u6211\u4eec\u4fdd\u7559\u4e86\u5bf9\u51fd\u6570\u7684\u5f15\u7528\uff0c\u8fd9\u4e00\u70b9\u5728\u79fb\u9664\u76d1\u542c\u5668\u65f6\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u79fb\u9664\u76d1\u542c\u5668<\/h3>\n<\/p>\n<p><p>\u6709\u65f6\u5019\uff0c\u6211\u4eec\u9700\u8981\u4ece\u5bf9\u8c61\u4e0a\u79fb\u9664\u4e00\u4e2a\u5df2\u6ce8\u518c\u7684\u4e8b\u4ef6\u76d1\u542c\u5668\u3002\u8fd9\u53ef\u80fd\u662f\u56e0\u4e3a\u6211\u4eec\u4e0d\u518d\u9700\u8981\u76d1\u542c\u8be5\u4e8b\u4ef6\uff0c\u6216\u8005\u56e0\u4e3a\u6211\u4eec\u60f3\u8981\u66ff\u6362\u6210\u4e00\u4e2a\u4e0d\u540c\u7684\u76d1\u542c\u5668\u3002<\/p>\n<\/p>\n<p><p><strong>1. \u4f7f\u7528<code>removeEventListener<\/code><\/strong><\/p>\n<\/p>\n<p><p>\u4f7f\u7528<code>removeEventListener<\/code>\u65b9\u6cd5\u53ef\u4ee5\u79fb\u9664\u5148\u524d\u4f7f\u7528<code>addEventListener<\/code>\u65b9\u6cd5\u6dfb\u52a0\u7684\u4e8b\u4ef6\u76d1\u542c\u5668\u3002\u6b64\u65b9\u6cd5\u4f7f\u7528\u4e0e<code>addEventListener<\/code>\u76f8\u540c\u7684\u4e24\u4e2a\u53c2\u6570\uff1a\u4e8b\u4ef6\u7c7b\u578b\u5b57\u7b26\u4e32\u548c\u4e8b\u4ef6\u5904\u7406\u5668\u5f15\u7528\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">button.removeEventListener(&#039;click&#039;, handleClick);<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong>2. \u4fdd\u7559\u5bf9\u5904\u7406\u5668\u7684\u5f15\u7528<\/strong><\/p>\n<\/p>\n<p><p><strong>\u79fb\u9664\u4e8b\u4ef6\u76d1\u542c\u5668\u65f6\uff0c\u4f20\u9012\u7ed9<code>removeEventListener<\/code>\u7684\u5904\u7406\u5668\u5fc5\u987b\u4e0e\u4f20\u9012\u7ed9<code>addEventListener<\/code>\u7684\u5904\u7406\u5668\u662f\u540c\u4e00\u4e2a\u5f15\u7528<\/strong>\u3002\u8fd9\u5c31\u662f\u4e3a\u4f55\u4f7f\u7528\u533f\u540d\u51fd\u6570\u6dfb\u52a0\u76d1\u542c\u5668\u65f6\u5f88\u96be\u79fb\u9664\u5b83\u4eec\u7684\u539f\u56e0\u2014\u2014\u6211\u4eec\u6ca1\u6709\u5f15\u7528\u6765\u8fdb\u884c\u5339\u914d\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u4e8b\u4ef6\u5904\u7406\u51fd\u6570<\/h3>\n<\/p>\n<p><p>\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u662f\u5f53\u4e8b\u4ef6\u53d1\u751f\u65f6\u6267\u884c\u7684\u4ee3\u7801\u3002\u5b83\u4eec\u53ef\u4ee5\u8fdb\u884c\u5404\u79cd\u64cd\u4f5c\uff0c\u6bd4\u5982\u4fee\u6539DOM\u3001\u8c03\u7528\u5176\u4ed6\u51fd\u6570\u3001\u6216\u8005\u751a\u81f3\u79fb\u9664\u81ea\u8eab\u4f5c\u4e3a\u76d1\u542c\u5668\u3002<\/p>\n<\/p>\n<p><p><strong>1. \u7f16\u5199\u4e8b\u4ef6\u5904\u7406\u51fd\u6570<\/strong><\/p>\n<\/p>\n<p><p>\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u901a\u5e38\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\uff0c\u5b83\u662f\u4e00\u4e2a\u4e8b\u4ef6\u5bf9\u8c61\uff0c\u5305\u542b\u4e86\u4e8b\u4ef6\u7684\u76f8\u5173\u4fe1\u606f\uff0c\u4f8b\u5982\u89e6\u53d1\u4e8b\u4ef6\u7684\u5143\u7d20\u3001\u4e8b\u4ef6\u7c7b\u578b\u3001\u4ee5\u53ca\u5176\u4ed6\u548c\u4e8b\u4ef6\u76f8\u5173\u7684\u5c5e\u6027\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">function handleClick(event) {<\/p>\n<p>    \/\/ \u53ef\u4ee5\u8bbf\u95eeevent.target\u6765\u83b7\u53d6\u89e6\u53d1\u4e8b\u4ef6\u7684\u5143\u7d20<\/p>\n<p>    alert(&#039;Button clicked!&#039;);<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u6b64\uff0c<code>handleClick<\/code>\u51fd\u6570\u7b80\u5355\u5730\u5f39\u51fa\u4e00\u4e2a\u8b66\u544a\u6846\uff0c\u6307\u793a\u6309\u94ae\u88ab\u70b9\u51fb\u3002<\/p>\n<\/p>\n<p><p><strong>2. \u5728\u5904\u7406\u51fd\u6570\u4e2d\u79fb\u9664\u76d1\u542c\u5668<\/strong><\/p>\n<\/p>\n<p><p>\u6709\u65f6\uff0c\u4e00\u4e2a\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u7684\u5de5\u4f5c\u4e4b\u4e00\u662f\u5728\u5b8c\u6210\u4efb\u52a1\u540e\u53d6\u6d88\u5b83\u81ea\u5df1\u7684\u76d1\u542c\u72b6\u6001\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">function handleClickOnce(event) {<\/p>\n<p>    alert(&#039;Button clicked once!&#039;);<\/p>\n<p>    event.target.removeEventListener(&#039;click&#039;, handleClickOnce);<\/p>\n<p>}<\/p>\n<p>button.addEventListener(&#039;click&#039;, handleClickOnce);<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728<code>handleClickOnce<\/code>\u51fd\u6570\u4e2d\uff0c\u5b83\u9996\u5148\u8b66\u544a\u7528\u6237\u6309\u94ae\u88ab\u70b9\u51fb\uff0c\u7136\u540e\u4ece\u6309\u94ae\u4e0a\u79fb\u9664\u5b83\u81ea\u5df1\uff0c\u786e\u4fdd\u5b83\u53ea\u4f1a\u88ab\u8c03\u7528\u4e00\u6b21\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n<p><p>\u5728\u5b9e\u9645\u7684\u5f00\u53d1\u4e2d\uff0c\u6dfb\u52a0\u548c\u79fb\u9664\u4e8b\u4ef6\u76d1\u542c\u5668\u662f\u4e00\u9879\u5e38\u89c1\u4e14\u91cd\u8981\u7684\u4efb\u52a1\u3002\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u7ba1\u7406\u76d1\u542c\u5668\u5bf9\u4e8e\u786e\u4fdd\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u548c\u7528\u6237\u4f53\u9a8c\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<\/p>\n<p><p><strong>1. \u4f18\u5316\u4e8b\u4ef6\u76d1\u542c<\/strong><\/p>\n<\/p>\n<p><p>\u6709\u65f6\u5019\uff0c\u4e3a\u63d0\u9ad8\u6027\u80fd\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5bf9\u4e8b\u4ef6\u76d1\u542c\u505a\u51fa\u4e00\u4e9b\u4f18\u5316\uff0c\u6bd4\u5982\u4f7f\u7528\u4e8b\u4ef6\u59d4\u6258\uff0c\u6216\u8005\u786e\u4fdd\u5728\u9002\u5f53\u7684\u65f6\u673a\u79fb\u9664\u4e0d\u9700\u8981\u7684\u76d1\u542c\u5668\u4ee5\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n<\/p>\n<p><p><strong>2. 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