{"id":1821,"date":"2024-11-10T14:50:04","date_gmt":"2024-11-10T06:50:04","guid":{"rendered":"https:\/\/fwq.ai\/blog\/1821\/"},"modified":"2024-11-10T14:50:04","modified_gmt":"2024-11-10T06:50:04","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88%e4%b8%89%e4%b8%aa%e6%8c%89%e9%92%ae%e7%82%b9%e5%87%bb%e4%ba%8b%e4%bb%b6%e8%a1%8c%e4%b8%ba%e4%b8%8d%e5%90%8c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/1821\/","title":{"rendered":"\u4e3a\u4ec0\u4e48\u4e09\u4e2a\u6309\u94ae\u70b9\u51fb\u4e8b\u4ef6\u884c\u4e3a\u4e0d\u540c\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173059867981710.jpg\" class=\"aligncenter\" title=\"\u4e3a\u4ec0\u4e48\u4e09\u4e2a\u6309\u94ae\u70b9\u51fb\u4e8b\u4ef6\u884c\u4e3a\u4e0d\u540c\uff1f\u63d2\u56fe\" alt=\"\u4e3a\u4ec0\u4e48\u4e09\u4e2a\u6309\u94ae\u70b9\u51fb\u4e8b\u4ef6\u884c\u4e3a\u4e0d\u540c\uff1f\u63d2\u56fe\" 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\u548c\u5355\u51fb\u4e8b\u4ef6<\/strong><\/p>\n<p>\u5355\u51fb\u6309\u94ae\u65f6\uff0c\u4f1a\u6267\u884c my_function() \u4e2d\u5b9a\u4e49\u7684\u4ee3\u7801\u3002\u4ee3\u7801\u83b7\u53d6\u6240\u6709\u6309\u94ae\uff08var str=document.getElementsByTagName(&#8216;button&#8217;)\uff09\uff0c\u7136\u540e\u5faa\u73af\u904d\u5386\u5b83\u4eec\u3002\u4e3a\u6bcf\u4e2a\u6309\u94ae\uff0c\u5b83\u521b\u5efa\u4e86\u4e00\u4e2a\u5305\u542b\u5355\u51fb\u8ba1\u6570\u5668\u7684\u533f\u540d\u51fd\u6570 myfn(a)\u3002<\/p>\n<p>\u533f\u540d\u51fd\u6570 myfn(a) \u968f\u540e\u7528\u53e6\u4e00\u4e2a\u533f\u540d\u51fd\u6570\u66ff\u6362\u4e86\u6309\u94ae\u7684 onclick \u4e8b\u4ef6\u4fa6\u542c\u5668\u3002\u8fd9\u4e2a\u65b0\u7684\u4e8b\u4ef6\u4fa6\u542c\u5668\u9012\u589e\u8ba1\u6570\u5668\u5e76\u663e\u793a\u70b9\u51fb\u6b21\u6570\u7684\u8b66\u62a5\u3002<\/p>\n<p><strong>3. alert(my_function()) \u7684 undefined<\/strong><\/p>\n<p>undefined \u8868\u793a\u6ca1\u6709\u8fd4\u56de\u503c\u3002\u5f53\u6211\u4eec\u8c03\u7528 my_function() \u65f6\uff0c\u5b83\u4f1a\u521d\u59cb\u5316\u70b9\u51fb\u8ba1\u6570\u5668\u5e76\u6267\u884c\u5faa\u73af\uff0c\u4f46\u5b83\u6ca1\u6709\u660e\u786e\u8fd4\u56de\u4efb\u4f55\u503c\u3002\u56e0\u6b64\uff0calert(my_function()) \u663e\u793a undefined\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u4e3a\u4ec0\u4e48\u4e09\u4e2a\u6309\u94ae\u884c\u4e3a\u4e0d\u540c\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8ba8\u6309\u94ae\u7684\u5965\u79d8 \u8fd9\u7bc7\u4ee3\u7801\u5173\u6ce8\u4e86 JavaScript \u4e2d\u4e8b\u4ef6\u5904\u7406\u7684\u7cbe\u9ad3\u3002\u6211\u4eec\u5728\u4ee3\u7801\u4e2d\u9047\u5230\u4e86\u4e09\u4e2a\u5e26\u6709\u76f8\u540c\u70b9\u51fb\u4e8b\u4ef6\u4fa6\u542c\u5668\u7684\u6309\u94ae\uff0c\u4f46\u5b83\u4eec\u7684\u5b9e\u9645\u884c\u4e3a\u5374\u6709\u7740\u4e0d\u540c\u7684\u5dee\u522b\u3002 \u89e3\u51b3\u95ee\u9898 1. my_function() \u7684\u4f5c\u7528 \u5728\u7b2c\u4e8c\u4e2a\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u6dfb\u52a0\u4e86 my_function() \u7684\u8c03\u7528\u3002\u8fd9\u5c06\u521d\u59cb\u5316\u6309\u94ae\u7684\u70b9\u51fb\u8ba1\u6570\u5668\uff0c\u5e76\u786e\u4fdd\u6bcf\u6b21\u5355\u51fb\u65f6\u90fd\u4f1a\u9012\u589e\u3002 2. my_function() \u548c\u5355\u51fb\u4e8b\u4ef6 \u5355\u51fb\u6309\u94ae\u65f6\uff0c\u4f1a\u6267\u884c my_function() \u4e2d\u5b9a\u4e49\u7684\u4ee3\u7801\u3002\u4ee3\u7801\u83b7\u53d6\u6240\u6709\u6309\u94ae\uff08var str=document.getElementsByTagName(&#8216;button&#8217;)\uff09\uff0c\u7136\u540e\u5faa\u73af\u904d\u5386\u5b83\u4eec\u3002\u4e3a\u6bcf\u4e2a\u6309\u94ae\uff0c\u5b83\u521b\u5efa\u4e86\u4e00\u4e2a\u5305\u542b\u5355\u51fb\u8ba1\u6570\u5668\u7684\u533f\u540d\u51fd\u6570 myfn(a)\u3002 \u533f\u540d\u51fd\u6570 myfn(a) \u968f\u540e\u7528\u53e6\u4e00\u4e2a\u533f\u540d\u51fd\u6570\u66ff\u6362\u4e86\u6309\u94ae\u7684 onclick 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\u4ee5\u4e0a\u5c31\u662f\u4e3a\u4ec0\u4e48\u4e09\u4e2a\u6309\u94ae\u884c\u4e3a\u4e0d\u540c\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-1821","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/1821","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=1821"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/1821\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=1821"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=1821"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=1821"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}