{"id":3718,"date":"2024-11-10T12:49:20","date_gmt":"2024-11-10T04:49:20","guid":{"rendered":"https:\/\/fwq.ai\/blog\/3718\/"},"modified":"2024-11-10T12:49:20","modified_gmt":"2024-11-10T04:49:20","slug":"%e4%b8%8b%e8%bd%bd%e7%9a%84-js-%e6%96%87%e4%bb%b6%e6%8a%a5%e9%94%99typeerror-_-is-undefined%ef%bc%8c%e5%a6%82%e4%bd%95%e8%a7%a3%e5%86%b3%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/3718\/","title":{"rendered":"\u4e0b\u8f7d\u7684 JS \u6587\u4ef6\u62a5\u9519\u201cTypeError: _ is undefined\u201d\uff0c\u5982\u4f55\u89e3\u51b3\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173112430882154.jpg\" class=\"aligncenter\" title=\"\u4e0b\u8f7d\u7684 JS \u6587\u4ef6\u62a5\u9519\u201cTypeError: _ is undefined\u201d\uff0c\u5982\u4f55\u89e3\u51b3\uff1f\u63d2\u56fe\" alt=\"\u4e0b\u8f7d\u7684 JS \u6587\u4ef6\u62a5\u9519\u201cTypeError: _ is undefined\u201d\uff0c\u5982\u4f55\u89e3\u51b3\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>\u89e3\u51b3\u7f51\u4e0a\u4e0b\u8f7d\u7684 js \u8c03\u7528\u9519\u8bef<\/strong><\/p>\n<p>\u95ee\u9898\u63cf\u8ff0\uff1a\u4ece\u7f51\u4e0a\u4e0b\u8f7d\u7684 js \u6587\u4ef6\u5728\u8c03\u7528\u65f6\u629b\u51fa\u4e86\u9519\u8bef\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>typeerror: _ is undefined<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u5177\u4f53\u9519\u8bef\u8be6\u60c5\uff1a<\/p>\n<ul>\n<li> <strong>\u9519\u8bef\u7c7b\u578b\uff1a<\/strong>typeerror<\/li>\n<li> <strong>\u9519\u8bef\u6d88\u606f\uff1a<\/strong>_ is undefined<\/li>\n<\/ul>\n<p><strong>\u95ee\u9898\u5206\u6790\uff1a<\/strong><\/p>\n<p>\u8be5\u9519\u8bef\u8868\u660e js \u6587\u4ef6\u4e2d\u4f7f\u7528\u4e86 _ \u53d8\u91cf\uff0c\u4f46\u672a\u8fdb\u884c\u5b9a\u4e49\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6cd5\uff1a<\/strong><\/p>\n<ol>\n<li> <strong>\u68c0\u67e5\u6587\u4ef6\u8def\u5f84\uff1a<\/strong>\u786e\u4fdd\u4e0b\u8f7d\u7684 js \u6587\u4ef6\u8def\u5f84\u6b63\u786e\uff0c\u907f\u514d\u8def\u5f84\u9519\u8bef\u6216\u7a7a\u683c\u3002<\/li>\n<li> <strong>\u9a8c\u8bc1\u53d8\u91cf\u5b9a\u4e49\uff1a<\/strong>\u6253\u5f00 js \u6587\u4ef6\uff0c\u67e5\u627e\u662f\u5426\u7f3a\u5c11 _ \u53d8\u91cf\u7684\u5b9a\u4e49\u3002\u5982\u679c\u7f3a\u5c11\uff0c\u6dfb\u52a0\u5982\u4e0b\u5b9a\u4e49\uff1a<\/li>\n<\/ol>\n<pre>var _ = undefined; \/\/\u6216\u8005 var _ = null;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<ol>\n<li> <strong>\u68c0\u67e5\u4f9d\u8d56\u5173\u7cfb\uff1a<\/strong>\u4e0b\u8f7d\u7684 js \u6587\u4ef6\u53ef\u80fd\u4f9d\u8d56\u4e8e\u5176\u4ed6\u6587\u4ef6\u6216\u5e93\u3002\u786e\u4fdd\u8fd9\u4e9b\u4f9d\u8d56\u5173\u7cfb\u5df2\u6b63\u786e\u5305\u542b\u6216\u94fe\u63a5\u3002<\/li>\n<li> <strong>\u66f4\u65b0\u6d4f\u89c8\u5668\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u8fc7\u65f6\u7684\u6d4f\u89c8\u5668\u53ef\u80fd\u5bfc\u81f4 js \u9519\u8bef\u3002\u5c1d\u8bd5\u66f4\u65b0\u5230\u6700\u65b0\u7248\u672c\u3002<\/li>\n<li> <strong>\u7981\u7528\u6d4f\u89c8\u5668\u6269\u5c55\uff1a<\/strong>\u6d4f\u89c8\u5668\u6269\u5c55\u6709\u65f6\u4f1a\u5e72\u6270 js \u6267\u884c\u3002\u5c1d\u8bd5\u7981\u7528\u6240\u6709\u6269\u5c55\uff0c\u7136\u540e\u91cd\u65b0\u52a0\u8f7d\u9875\u9762\u3002<\/li>\n<li> <strong>\u8054\u7cfb\u5f00\u53d1\u8005\uff1a<\/strong>\u5982\u679c\u4e0a\u8ff0\u65b9\u6cd5\u5747\u65e0\u6cd5\u89e3\u51b3\u95ee\u9898\uff0c\u8bf7\u8054\u7cfb js \u6587\u4ef6\u7684\u5f00\u53d1\u8005\u83b7\u53d6\u652f\u6301\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0a\u5c31\u662f\u4e0b\u8f7d\u7684 JS \u6587\u4ef6\u62a5\u9519\u201cTypeError: _ is undefined\u201d\uff0c\u5982\u4f55\u89e3\u51b3\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>\u89e3\u51b3\u7f51\u4e0a\u4e0b\u8f7d\u7684 js \u8c03\u7528\u9519\u8bef \u95ee\u9898\u63cf\u8ff0\uff1a\u4ece\u7f51\u4e0a\u4e0b\u8f7d\u7684 js \u6587\u4ef6\u5728\u8c03\u7528\u65f6\u629b\u51fa\u4e86\u9519\u8bef\uff0c\u5982\u4e0b\u6240\u793a\uff1a typeerror: _ is undefined \u767b\u5f55\u540e\u590d\u5236 \u5177\u4f53\u9519\u8bef\u8be6\u60c5\uff1a \u9519\u8bef\u7c7b\u578b\uff1atypeerror \u9519\u8bef\u6d88\u606f\uff1a_ is undefined \u95ee\u9898\u5206\u6790\uff1a \u8be5\u9519\u8bef\u8868\u660e js \u6587\u4ef6\u4e2d\u4f7f\u7528\u4e86 _ \u53d8\u91cf\uff0c\u4f46\u672a\u8fdb\u884c\u5b9a\u4e49\u3002 \u89e3\u51b3\u65b9\u6cd5\uff1a \u68c0\u67e5\u6587\u4ef6\u8def\u5f84\uff1a\u786e\u4fdd\u4e0b\u8f7d\u7684 js \u6587\u4ef6\u8def\u5f84\u6b63\u786e\uff0c\u907f\u514d\u8def\u5f84\u9519\u8bef\u6216\u7a7a\u683c\u3002 \u9a8c\u8bc1\u53d8\u91cf\u5b9a\u4e49\uff1a\u6253\u5f00 js \u6587\u4ef6\uff0c\u67e5\u627e\u662f\u5426\u7f3a\u5c11 _ \u53d8\u91cf\u7684\u5b9a\u4e49\u3002\u5982\u679c\u7f3a\u5c11\uff0c\u6dfb\u52a0\u5982\u4e0b\u5b9a\u4e49\uff1a var _ = undefined; \/\/\u6216\u8005 var _ = null; \u767b\u5f55\u540e\u590d\u5236 \u68c0\u67e5\u4f9d\u8d56\u5173\u7cfb\uff1a\u4e0b\u8f7d\u7684 js \u6587\u4ef6\u53ef\u80fd\u4f9d\u8d56\u4e8e\u5176\u4ed6\u6587\u4ef6\u6216\u5e93\u3002\u786e\u4fdd\u8fd9\u4e9b\u4f9d\u8d56\u5173\u7cfb\u5df2\u6b63\u786e\u5305\u542b\u6216\u94fe\u63a5\u3002 \u66f4\u65b0\u6d4f\u89c8\u5668\uff1a\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u8fc7\u65f6\u7684\u6d4f\u89c8\u5668\u53ef\u80fd\u5bfc\u81f4 js \u9519\u8bef\u3002\u5c1d\u8bd5\u66f4\u65b0\u5230\u6700\u65b0\u7248\u672c\u3002 \u7981\u7528\u6d4f\u89c8\u5668\u6269\u5c55\uff1a\u6d4f\u89c8\u5668\u6269\u5c55\u6709\u65f6\u4f1a\u5e72\u6270 js \u6267\u884c\u3002\u5c1d\u8bd5\u7981\u7528\u6240\u6709\u6269\u5c55\uff0c\u7136\u540e\u91cd\u65b0\u52a0\u8f7d\u9875\u9762\u3002 \u8054\u7cfb\u5f00\u53d1\u8005\uff1a\u5982\u679c\u4e0a\u8ff0\u65b9\u6cd5\u5747\u65e0\u6cd5\u89e3\u51b3\u95ee\u9898\uff0c\u8bf7\u8054\u7cfb js \u6587\u4ef6\u7684\u5f00\u53d1\u8005\u83b7\u53d6\u652f\u6301\u3002 \u4ee5\u4e0a\u5c31\u662f\u4e0b\u8f7d\u7684 JS [&hellip;]<\/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-3718","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3718","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=3718"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3718\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=3718"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=3718"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=3718"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}