{"id":110,"date":"2022-03-23T21:34:37","date_gmt":"2022-03-23T13:34:37","guid":{"rendered":"http:\/\/weboob.top\/blog\/?p=110"},"modified":"2022-03-23T21:34:37","modified_gmt":"2022-03-23T13:34:37","slug":"2-1-%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e6%a6%82%e8%bf%b0","status":"publish","type":"post","link":"http:\/\/blog.weboob.top\/?p=110","title":{"rendered":"2.1 \u6570\u636e\u7c7b\u578b\u6982\u8ff0"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/wangdoc.com\/javascript\/types\/general.html\">\u539f\u6587\u5730\u5740<\/a><br \/><a href=\"http:\/\/weboob.top\/blog\/?p=110\">\u6211\u7684\u535a\u5ba2<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1%E6%A6%82%E8%BF%B0\">1.\u6982\u8ff0<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript \u8bed\u8a00\u6570\u636e\u7c7b\u578b\u5171 6 \u79cd\u3010ES5\u8303\u7574\u3011\u3002<br \/>ES6\u589e\u52a0\u7b2c\u4e03\u79cd\uff1aSymbol<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>number<\/li><li>string<\/li><li>boolean<\/li><li>undefined<\/li><li>null<\/li><li>object<\/li><\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\u524d\u4e09\u79cd\uff1aprimitive type\uff08\u539f\u59cb\u7c7b\u578b\uff09<br \/>object\uff1acomplex type\uff08\u5408\u6210\u7c7b\u578b\uff09\uff0c\u53ef\u4ee5\u770b\u505a\u5bb9\u5668<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">object \u5206\u4e09\u4e2a&nbsp;<em><strong>\u5b50\u7c7b\u578b<\/strong><\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u72ed\u4e49\u7684\u5bf9\u8c61 object<\/li><li>\u6570\u7ec4 array<\/li><li>\u51fd\u6570 function<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"2-typeof-%E8%BF%90%E7%AE%97%E7%AC%A6\">2. typeof \u8fd0\u7b97\u7b26<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript \u786e\u8ba4\u4e00\u4e2a\u503c\u5c5e\u4e8e\u4ec0\u4e48\u7c7b\u578b\u6709\u4e09\u79cd\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>typeof \u8fd0\u7b97\u7b26<\/li><li>instanceof \u8fd0\u7b97\u7b26<\/li><li>Object.prototype.toString \u65b9\u6cd5<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0b\u662f\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>typeof 123          \/\/ \"number\"\ntypeof '123'        \/\/ \"string\"\ntypeof false        \/\/ \"boolean\"\ntypeof undefined    \/\/ \"undefined\"\n\nfunction f(){}\ntypeof f            \/\/ \"function\"\n\ntypeof window       \/\/ \"object\"\ntypeof {}           \/\/ \"object\"\ntypeof &#91;]           \/\/ \"object\"\n\ntype null           \/\/ \"object\"\n<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>null \u7c7b\u578b\u8fd4\u56de object \u662f\u5386\u53f2\u9057\u7559\u539f\u56e0\u3002<br \/>1995\u5e74\u7684 JavaScript \u7b2c\u4e00\u7248\u672c\u6ca1\u8003\u8651\u5230 null \u8fd9\u4e00\u7279\u6b8a\u503c\u3002<\/p><\/blockquote>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"3%E5%8F%82%E8%80%83%E9%93%BE%E6%8E%A5\">3.\u53c2\u8003\u94fe\u63a5<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Axel Rauschmayer,&nbsp;<a href=\"http:\/\/www.2ality.com\/2011\/11\/improving-typeof.html\">Improving the JavaScript typeof operator<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5730\u5740\u6211\u7684\u535a\u5ba2 1.\u6982\u8ff0 JavaScript \u8bed\u8a00\u6570\u636e\u7c7b\u578b\u5171 6 \u79cd\u3010ES5\u8303\u7574\u3011\u3002ES6\u589e\u52a0\u7b2c\u4e03\u79cd\uff1aSy [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,10,5],"tags":[],"class_list":["post-110","post","type-post","status-publish","format-standard","hentry","category-es5","category-js","category-code_article"],"_links":{"self":[{"href":"http:\/\/blog.weboob.top\/index.php?rest_route=\/wp\/v2\/posts\/110","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/blog.weboob.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.weboob.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.weboob.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.weboob.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=110"}],"version-history":[{"count":0,"href":"http:\/\/blog.weboob.top\/index.php?rest_route=\/wp\/v2\/posts\/110\/revisions"}],"wp:attachment":[{"href":"http:\/\/blog.weboob.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=110"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.weboob.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=110"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.weboob.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=110"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}