{"id":91386,"date":"2024-04-09T18:27:50","date_gmt":"2024-04-09T10:27:50","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/91386.html"},"modified":"2024-04-09T18:27:51","modified_gmt":"2024-04-09T10:27:51","slug":"javascript%e4%b8%ad%e7%9a%84%e8%87%aa%e5%ae%9a%e4%b9%89%e6%8c%87%e4%bb%a4%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/91386.html","title":{"rendered":"JavaScript\u4e2d\u7684\u81ea\u5b9a\u4e49\u6307\u4ee4\u5b9e\u73b0"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/02151214\/67fa0778-af09-4b79-8282-c04400364e5b.webp\" alt=\"JavaScript\u4e2d\u7684\u81ea\u5b9a\u4e49\u6307\u4ee4\u5b9e\u73b0\" \/><\/p>\n<p><p>JavaScript\u4e2d\u7684\u81ea\u5b9a\u4e49\u6307\u4ee4\u5141\u8bb8\u5f00\u53d1\u4eba\u5458\u521b\u5efa\u5177\u6709\u4e13\u95e8\u903b\u8f91\u7684\u4ee3\u7801\u7247\u6bb5\uff0c<strong>\u53ef\u7528\u4e8e\u589e\u5f3aDOM\u64cd\u4f5c\u3001\u6dfb\u52a0\u6570\u636e\u7ed1\u5b9a\u884c\u4e3a\u6216\u521b\u5efa\u53ef\u91cd\u7528\u7684\u4ea4\u4e92\u884c\u4e3a<\/strong>\u3002\u81ea\u5b9a\u4e49\u6307\u4ee4\u7684\u5b9e\u73b0\u901a\u5e38\u7ed3\u5408\u4e86HTML\u5c5e\u6027\u3001JavaScript\u51fd\u6570\u548c\u4e0a\u4e0b\u6587\u72b6\u6001\u7684\u7ba1\u7406\u3002\u4ee5Vue.js\u6846\u67b6\u4e3a\u4f8b\uff0c\u81ea\u5b9a\u4e49\u6307\u4ee4\u7684\u521b\u5efa\u8fc7\u7a0b\u5305\u62ec\u58f0\u660e\u6307\u4ee4\u3001\u6ce8\u518c\u6307\u4ee4\u4ee5\u53ca\u5b9a\u4e49\u6307\u4ee4\u7684\u94a9\u5b50\u51fd\u6570\uff0c\u5176\u4e2d<strong>\u94a9\u5b50\u51fd\u6570\u63a7\u5236\u6307\u4ee4\u7684\u884c\u4e3a<\/strong>\uff0c\u5e76\u5141\u8bb8\u5f00\u53d1\u8005\u5728\u6307\u4ee4\u7684\u751f\u547d\u5468\u671f\u5185\u7684\u4e0d\u540c\u9636\u6bb5\u4ecb\u5165\uff0c\u5305\u62ec\u7ed1\u5b9a\u65f6\u3001\u7ed1\u5b9a\u7684\u5143\u7d20\u63d2\u5165DOM\u65f6\u3001\u7ec4\u4ef6\u66f4\u65b0\u65f6\u3001\u7ec4\u4ef6\u88ab\u79fb\u9664\u65f6\u7b49\u65f6\u673a\u3002<\/p>\n<\/p>\n<p><p>\u81ea\u5b9a\u4e49\u6307\u4ee4\u7684\u6838\u5fc3\u662f\u6269\u5c55\u548c\u5c01\u88c5DOM\u64cd\u4f5c\u7684\u6a21\u5f0f\uff0c\u4f8b\u5982\uff0c\u4e00\u65e6\u521b\u5efa\uff0c\u53ef\u4ee5\u5728\u5e94\u7528\u7a0b\u5e8f\u7684\u4e0d\u540c\u90e8\u5206\u91cd\u590d\u4f7f\u7528\u8be5\u6307\u4ee4\uff0c\u4e0d\u4ec5\u63d0\u9ad8\u4e86\u4ee3\u7801\u590d\u7528\u6027\u800c\u4e14\u8fd8\u4fdd\u6301\u4e86DOM\u64cd\u4f5c\u7684\u4e00\u81f4\u6027\u4e0e\u4f18\u96c5\u6027\u3002\u4efb\u4f55\u9700\u8981\u64cd\u4f5cDOM\u7684\u590d\u6742\u903b\u8f91\u6216\u662f\u9488\u5bf9\u7279\u5b9aDOM\u5143\u7d20\u7684\u589e\u5f3a\u90fd\u53ef\u4ee5\u5c01\u88c5\u5728\u81ea\u5b9a\u4e49\u6307\u4ee4\u4e2d\u3002<\/p>\n<\/p>\n<p><p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u901a\u8fc7\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\u6765\u8be6\u7ec6\u63a2\u8ba8JavaScript\u4e2d\u81ea\u5b9a\u4e49\u6307\u4ee4\u7684\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u81ea\u5b9a\u4e49\u6307\u4ee4\u7684\u57fa\u672c\u6982\u5ff5<\/h3>\n<\/p>\n<p><p><strong>\u6307\u4ee4\u7684\u6982\u5ff5<\/strong><\/p>\n<\/p>\n<p><p>\u6307\u4ee4\u662f\u4e00\u79cd\u5305\u542b\u7279\u5b9a\u903b\u8f91\u7684\u4ee3\u7801\u6a21\u5757\uff0c\u5b83\u53ef\u4ee5\u5728HTML\u6a21\u677f\u4e2d\u4ee5\u7279\u5b9a\u7684\u8bed\u6cd5\u88ab\u58f0\u660e\uff0c\u5e76\u5728\u6267\u884c\u65f6\u5bf9DOM\u5143\u7d20\u8fdb\u884c\u64cd\u4f5c\u3002\u6307\u4ee4\u901a\u5e38\u662f\u54cd\u5e94\u5f0f\u7684\uff0c\u5f53\u76d1\u542c\u5230\u6570\u636e\u7684\u6539\u53d8\u65f6\u80fd\u591f\u81ea\u52a8\u5730\u66f4\u65b0DOM\u3002<\/p>\n<\/p>\n<p><p><strong>\u6307\u4ee4\u7684\u751f\u547d\u5468\u671f<\/strong> <\/p>\n<\/p>\n<p><p>\u81ea\u5b9a\u4e49\u6307\u4ee4\u62e5\u6709\u751f\u547d\u5468\u671f\u94a9\u5b50\u51fd\u6570\uff0c\u901a\u8fc7\u8fd9\u4e9b\u94a9\u5b50\u51fd\u6570\uff0c\u53ef\u4ee5\u5728\u6307\u4ee4\u7ed1\u5b9a\u5230\u5143\u7d20\u65f6\u3001\u6307\u4ee4\u6240\u5728\u6a21\u677f\u66f4\u65b0\u65f6\u4ee5\u53ca\u6307\u4ee4\u5378\u8f7d\u65f6\u6267\u884c\u7279\u5b9a\u7684\u4ee3\u7801\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u521b\u5efa\u81ea\u5b9a\u4e49\u6307\u4ee4<\/h3>\n<\/p>\n<p><p><strong>\u58f0\u660e\u81ea\u5b9a\u4e49\u6307\u4ee4<\/strong><\/p>\n<\/p>\n<p><p>\u5728\u58f0\u660e\u81ea\u5b9a\u4e49\u6307\u4ee4\u65f6\uff0c\u901a\u5e38\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u5177\u6709\u591a\u4e2a\u751f\u547d\u5468\u671f\u94a9\u5b50\u7684\u5bf9\u8c61\u3002\u6bcf\u4e2a\u94a9\u5b50\u53ef\u4ee5\u8bbf\u95ee\u7ed1\u5b9a\u5230\u5143\u7d20\u4e0a\u7684\u6307\u4ee4\u4fe1\u606f\uff0c\u5982\u8868\u8fbe\u5f0f\u7684\u503c\u3001\u65e7\u503c\u7b49\u3002<\/p>\n<\/p>\n<p><p><strong>\u6ce8\u518c\u6307\u4ee4<\/strong><\/p>\n<\/p>\n<p><p>\u81ea\u5b9a\u4e49\u6307\u4ee4\u53ef\u4ee5\u88ab\u6ce8\u518c\u4e3a\u5168\u5c40\u6216\u5c40\u90e8\u3002\u5168\u5c40\u6ce8\u518c\u901a\u8fc7JavaScript\u6846\u67b6\u7684\u5168\u5c40\u65b9\u6cd5\u8fdb\u884c\uff0c\u5c40\u90e8\u6ce8\u518c\u5219\u5728\u7ec4\u4ef6\u5185\u90e8\u8fdb\u884c\uff0c\u8fd9\u4e24\u79cd\u65b9\u6cd5\u7684\u9009\u62e9\u53d6\u51b3\u4e8e\u6307\u4ee4\u7684\u4f7f\u7528\u8303\u56f4\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u94a9\u5b50\u51fd\u6570\u7684\u4f5c\u7528<\/h3>\n<\/p>\n<p><p><strong>bind\u94a9\u5b50<\/strong><\/p>\n<\/p>\n<p><p><code>bind<\/code>\u662f\u5728\u6307\u4ee4\u7b2c\u4e00\u6b21\u7ed1\u5b9a\u5230\u5143\u7d20\u65f6\u8c03\u7528\uff0c\u7528\u4e8e\u6267\u884c\u4e00\u6b21\u6027\u7684\u521d\u59cb\u5316\u8bbe\u7f6e\u3002\u5728\u8fd9\u4e2a\u9636\u6bb5\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u4e00\u4e9b\u53ea\u9700\u8981\u8fd0\u884c\u4e00\u6b21\u7684DOM\u64cd\u4f5c\u6216\u4e8b\u4ef6\u76d1\u542c\u3002<\/p>\n<\/p>\n<p><p><strong>inserted\u94a9\u5b50<\/strong><\/p>\n<\/p>\n<p><p><code>inserted<\/code>\u94a9\u5b50\u5728\u88ab\u7ed1\u5b9a\u5143\u7d20\u63d2\u5165\u5230\u7236\u8282\u70b9\u65f6\u8c03\u7528\uff08\u6b64\u65f6\u5c1a\u672a\u6302\u8f7d\u5230DOM\u6811\uff09\u3002\u8fd9\u662f\u786e\u4fdd\u7236\u8282\u70b9\u5b58\u5728\u7684\u6700\u4f73\u65f6\u673a\uff0c\u4ece\u800c\u8fdb\u884cDOM\u64cd\u4f5c\uff0c\u4f8b\u5982\u64cd\u4f5c\u5143\u7d20\u7684\u4f4d\u7f6e\u6216\u5927\u5c0f\u3002<\/p>\n<\/p>\n<p><p><strong>update\u94a9\u5b50<\/strong><\/p>\n<\/p>\n<p><p><code>update<\/code>\u94a9\u5b50\u5728\u5305\u542b\u6307\u4ee4\u7684\u7ec4\u4ef6\u7684VNode\u66f4\u65b0\u65f6\u88ab\u8c03\u7528\uff0c\u4f46\u662f\u53ef\u80fd\u5728\u5176\u5b50VNode\u66f4\u65b0\u4e4b\u524d\u8c03\u7528\u3002\u53ef\u4ee5\u5728\u8fd9\u91cc\u6267\u884c\u4f9d\u8d56\u4e8e\u7ed1\u5b9a\u503c\u7684\u66f4\u65b0DOM\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<p><p><strong>componentUpdated\u94a9\u5b50<\/strong><\/p>\n<\/p>\n<p><p><code>componentUpdated<\/code>\u94a9\u5b50\u5728\u5305\u542b\u6307\u4ee4\u7684\u7ec4\u4ef6\u7684VNode\u53ca\u5176\u5b50VNode\u5168\u90e8\u66f4\u65b0\u540e\u8c03\u7528\u3002\u5982\u679c\u6307\u4ee4\u7684\u66f4\u65b0\u903b\u8f91\u9700\u8981\u77e5\u9053\u5176\u5b50\u7ec4\u4ef6\u662f\u5426\u4e5f\u66f4\u65b0\u5b8c\u6210\uff0c\u5e94\u8be5\u5728\u8fd9\u4e2a\u94a9\u5b50\u5185\u6267\u884c\u3002<\/p>\n<\/p>\n<p><p><strong>unbind\u94a9\u5b50<\/strong><\/p>\n<\/p>\n<p><p><code>unbind<\/code>\u5728\u6307\u4ee4\u4e0e\u5143\u7d20\u89e3\u7ed1\u65f6\u88ab\u8c03\u7528\uff0c\u53ef\u4ee5\u8fdb\u884c\u6e05\u7406\u5de5\u4f5c\uff0c\u5982\u79fb\u9664\u4e8b\u4ef6\u76d1\u542c\u5668\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u5e94\u7528\u4e3e\u4f8b<\/h3>\n<\/p>\n<p><p><strong>\u7b80\u5355\u7684\u81ea\u5b9a\u4e49\u6307\u4ee4<\/strong><\/p>\n<\/p>\n<p><p>\u4f8b\u5982\uff0c\u521b\u5efa\u4e00\u4e2a\u7528\u4e8e\u8bbe\u7f6e\u5143\u7d20\u7126\u70b9\u7684\u6307\u4ee4<code>v-focus<\/code>\uff0c\u53ea\u9700\u8981\u5728<code>inserted<\/code>\u94a9\u5b50\u4e2d\u8ba9\u5143\u7d20\u83b7\u5f97\u7126\u70b9\u3002<\/p>\n<\/p>\n<p><p><strong>\u52a8\u6001\u6307\u4ee4\u548c\u53c2\u6570\u4f20\u9012<\/strong><\/p>\n<\/p>\n<p><p>\u53ef\u4ee5\u7ed9\u6307\u4ee4\u4f20\u9012\u53c2\u6570\uff0c\u8c03\u6574\u6307\u4ee4\u884c\u4e3a\u3002\u5982\u521b\u5efa\u4e00\u4e2a<code>v-format<\/code>\u6307\u4ee4\u5904\u7406\u6587\u672c\u683c\u5f0f\uff0c\u53ef\u4ee5\u4f20\u5165\u4e0d\u540c\u7684\u683c\u5f0f\u5316\u7c7b\u578b\u3002<\/p>\n<\/p>\n<p><h3>\u4e94\u3001\u6307\u4ee4\u7684\u4f7f\u7528\u548c\u6d4b\u8bd5<\/h3>\n<\/p>\n<p><p><strong>\u5728\u7ec4\u4ef6\u4e2d\u4f7f\u7528\u6307\u4ee4<\/strong><\/p>\n<\/p>\n<p><p>\u4f7f\u7528\u5df2\u6ce8\u518c\u7684\u6307\u4ee4\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u8981\u5728HTML\u6a21\u677f\u4e2d\u901a\u8fc7\u7279\u5b9a\u7684\u524d\u7f00\u548c\u6307\u4ee4\u540d\u8fdb\u884c\u8c03\u7528\u5373\u53ef\u3002\u6b63\u786e\u7684\u6570\u636e\u7ed1\u5b9a\u4e0e\u76d1\u542c\u53ef\u4ee5\u8ba9\u6307\u4ee4\u54cd\u5e94\u6570\u636e\u53d8\u5316\u3002<\/p>\n<\/p>\n<p><p><strong>\u6307\u4ee4\u5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class=\"language-javascript\">function highlight(element) {\n  \/\/ \u8bbe\u7f6e\u80cc\u666f\u989c\u8272\u4e3a\u9ec4\u8272\n  element.style.backgroundColor = &quot;yellow&quot;;\n}\n\n\/\/ 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class=\"language-javascript\">const customDirective = {\n  highlight: function(element) {\n    \/\/ \u8bbe\u7f6e\u80cc\u666f\u989c\u8272\u4e3a\u9ec4\u8272\n    element.style.backgroundColor = &quot;yellow&quot;;\n  }\n};\n\n\/\/ 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class=\"language-javascript\">class CustomDirective {\n  highlight(element) {\n    \/\/ \u8bbe\u7f6e\u80cc\u666f\u989c\u8272\u4e3a\u9ec4\u8272\n    element.style.backgroundColor = &quot;yellow&quot;;\n  }\n}\n\n\/\/ \u521b\u5efaCustomDirective\u7c7b\u7684\u5b9e\u4f8b\nconst customDirective = new CustomDirective();\n\n\/\/ \u8c03\u7528customDirective\u5bf9\u8c61\u7684highlight\u65b9\u6cd5\uff0c\u5c06\u6307\u5b9a\u5143\u7d20\u7684\u80cc\u666f\u989c\u8272\u8bbe\u7f6e\u4e3a\u9ec4\u8272\ncustomDirective.highlight(document.getElementById(&quot;myElement&quot;));\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"JavaScript\u4e2d\u7684\u81ea\u5b9a\u4e49\u6307\u4ee4\u5141\u8bb8\u5f00\u53d1\u4eba\u5458\u521b\u5efa\u5177\u6709\u4e13\u95e8\u903b\u8f91\u7684\u4ee3\u7801\u7247\u6bb5\uff0c\u53ef\u7528\u4e8e\u589e\u5f3aDOM\u64cd\u4f5c\u3001\u6dfb\u52a0\u6570\u636e\u7ed1\u5b9a\u884c 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