{"id":52249,"date":"2024-12-03T10:57:54","date_gmt":"2024-12-03T02:57:54","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52249\/"},"modified":"2024-12-03T10:57:54","modified_gmt":"2024-12-03T02:57:54","slug":"javascript-%e4%b8%ad-class2type-tostring-call-obj-%e5%a6%82%e4%bd%95%e8%8e%b7%e5%8f%96%e5%af%b9%e8%b1%a1%e7%b1%bb%e5%9e%8b%e5%ad%97%e7%ac%a6%e4%b8%b2%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52249\/","title":{"rendered":"JavaScript \u4e2d class2type[ toString.call( obj ) ] \u5982\u4f55\u83b7\u53d6\u5bf9\u8c61\u7c7b\u578b\u5b57\u7b26\u4e32\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>JavaScript \u4e2d class2type[ toString.call( obj ) ] \u5982\u4f55\u83b7\u53d6\u5bf9\u8c61\u7c7b\u578b\u5b57\u7b26\u4e32\uff1f<\/h1>\n<p>\u5728IT\u884c\u4e1a\u8fd9\u4e2a\u53d1\u5c55\u66f4\u65b0\u901f\u5ea6\u5f88\u5feb\u7684\u884c\u4e1a\uff0c\u53ea\u6709\u4e0d\u505c\u6b62\u7684\u5b66\u4e60\uff0c\u624d\u4e0d\u4f1a\u88ab\u884c\u4e1a\u6240\u6dd8\u6c70\u3002\u5982\u679c\u4f60\u662f\u6587\u7ae0\u5b66\u4e60\u8005\uff0c\u90a3\u4e48\u672c\u6587\u300aJavaScript \u4e2d class2type[ toString.call( obj ) ] \u5982\u4f55\u83b7\u53d6\u5bf9\u8c61\u7c7b\u578b\u5b57\u7b26\u4e32\uff1f\u300b\u5c31\u5f88\u9002\u5408\u4f60\uff01\u672c\u7bc7\u5185\u5bb9\u4e3b\u8981\u5305\u62ec##content_title##\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241119\/1732014579673c71f33fd58.jpg\" class=\"aligncenter\" title=\"JavaScript \u4e2d class2type[ toString.call( obj ) ] \u5982\u4f55\u83b7\u53d6\u5bf9\u8c61\u7c7b\u578b\u5b57\u7b26\u4e32\uff1f\u63d2\u56fe\" alt=\"JavaScript \u4e2d class2type[ toString.call( obj ) ] \u5982\u4f55\u83b7\u53d6\u5bf9\u8c61\u7c7b\u578b\u5b57\u7b26\u4e32\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>jquery \u83b7\u53d6\u5bf9\u8c61\u7c7b\u578b\u5b57\u7b26\u4e32<\/strong><\/p>\n<p>\u5728\u95ee\u9898\u4e2d\uff0c\u4f60\u63d0\u5230\u4e86\u4e00\u4e2a\u9700\u8981\u5e2e\u52a9\u7406\u89e3\u7684\u4ee3\u7801\u7247\u6bb5\uff1a<\/p>\n<pre>class2type[ toString.call( obj ) ]<\/pre>\n<p><strong>\u56de\u7b54<\/strong><\/p>\n<p>class2type.tostring \u7b49\u4e8e object.prototype.tostring\u3002\u5728 javascript \u4e2d\uff0ctostring \u65b9\u6cd5\u7528\u4e8e\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\u7684\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f\u3002\u5bf9\u4e8e\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\uff0ctostring \u4f1a\u8fd4\u56de\u4e0d\u540c\u7684\u7ed3\u679c\u3002\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>tostring.call(null) \u8fd4\u56de &#8220;null&#8221;<\/li>\n<li>tostring.call(undefined) \u8fd4\u56de &#8220;undefined&#8221;<\/li>\n<li>tostring.call({}) \u8fd4\u56de &#8220;[object object]&#8221;<\/li>\n<li>tostring.call([]) \u8fd4\u56de &#8220;[object array]&#8221;<\/li>\n<\/ul>\n<p>class2type \u5b57\u5178\u5c06 tostring \u8fd4\u56de\u7684\u5b57\u7b26\u4e32\u4f5c\u4e3a\u952e\uff0c\u5bf9\u5e94\u503c\u5c31\u662f\u5bf9\u8c61\u7684\u7c7b\u578b\u5b57\u7b26\u4e32\u3002\u56e0\u6b64\uff0cclass2type[ tostring.call( obj ) ] \u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8868\u793a\u5bf9\u8c61 obj \u7684\u7c7b\u578b\u3002<\/p>\n<p>\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300aJavaScript \u4e2d class2type[ toString.call( obj ) ] \u5982\u4f55\u83b7\u53d6\u5bf9\u8c61\u7c7b\u578b\u5b57\u7b26\u4e32\uff1f\u300b\u7684\u4ecb\u7ecd\u5e94\u8be5\u8ba9\u4f60\u6536\u83b7\u591a\u591a\u4e86\u5427\uff01\u6b22\u8fce\u5927\u5bb6\u6536\u85cf\u6216\u5206\u4eab\u7ed9\u66f4\u591a\u9700\u8981\u5b66\u4e60\u7684\u670b\u53cb\u5427~\u7c73\u4e91\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03\u6587\u7ae0\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01<\/p>\n<dl>\n<dt><\/dt>\n<dd>\n   JavaScript \u62a5\u9519 \\&#8221;$ \u672a\u5b9a\u4e49\\&#8221; \u5982\u4f55\u89e3\u51b3\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript \u4e2d class2type[ toString.call( obj ) ] \u5982\u4f55\u83b7\u53d6\u5bf9\u8c61\u7c7b\u578b\u5b57\u7b26\u4e32\uff1f \u5728IT\u884c\u4e1a\u8fd9\u4e2a\u53d1\u5c55\u66f4\u65b0\u901f\u5ea6\u5f88\u5feb\u7684\u884c\u4e1a\uff0c\u53ea\u6709\u4e0d\u505c\u6b62\u7684\u5b66\u4e60\uff0c\u624d\u4e0d\u4f1a\u88ab\u884c\u4e1a\u6240\u6dd8\u6c70\u3002\u5982\u679c\u4f60\u662f\u6587\u7ae0\u5b66\u4e60\u8005\uff0c\u90a3\u4e48\u672c\u6587\u300aJavaScript \u4e2d class2type[ toString.call( obj ) ] \u5982\u4f55\u83b7\u53d6\u5bf9\u8c61\u7c7b\u578b\u5b57\u7b26\u4e32\uff1f\u300b\u5c31\u5f88\u9002\u5408\u4f60\uff01\u672c\u7bc7\u5185\u5bb9\u4e3b\u8981\u5305\u62ec##content_title##\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01 jquery \u83b7\u53d6\u5bf9\u8c61\u7c7b\u578b\u5b57\u7b26\u4e32 \u5728\u95ee\u9898\u4e2d\uff0c\u4f60\u63d0\u5230\u4e86\u4e00\u4e2a\u9700\u8981\u5e2e\u52a9\u7406\u89e3\u7684\u4ee3\u7801\u7247\u6bb5\uff1a class2type[ toString.call( obj ) ] \u56de\u7b54 class2type.tostring \u7b49\u4e8e object.prototype.tostring\u3002\u5728 javascript \u4e2d\uff0ctostring \u65b9\u6cd5\u7528\u4e8e\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\u7684\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f\u3002\u5bf9\u4e8e\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\uff0ctostring \u4f1a\u8fd4\u56de\u4e0d\u540c\u7684\u7ed3\u679c\u3002\u4f8b\u5982\uff1a tostring.call(null) \u8fd4\u56de &#8220;null&#8221; tostring.call(undefined) \u8fd4\u56de &#8220;undefined&#8221; tostring.call({}) \u8fd4\u56de &#8220;[object object]&#8221; tostring.call([]) \u8fd4\u56de &#8220;[object array]&#8221; class2type \u5b57\u5178\u5c06 tostring \u8fd4\u56de\u7684\u5b57\u7b26\u4e32\u4f5c\u4e3a\u952e\uff0c\u5bf9\u5e94\u503c\u5c31\u662f\u5bf9\u8c61\u7684\u7c7b\u578b\u5b57\u7b26\u4e32\u3002\u56e0\u6b64\uff0cclass2type[ tostring.call( obj ) ] \u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8868\u793a\u5bf9\u8c61 [&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-52249","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52249","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=52249"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52249\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=52249"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=52249"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=52249"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}