{"id":270,"date":"2021-07-01T16:10:30","date_gmt":"2021-07-01T08:10:30","guid":{"rendered":"http:\/\/gjweb.top\/?p=270"},"modified":"2021-07-01T16:10:30","modified_gmt":"2021-07-01T08:10:30","slug":"js%e7%b1%bb%e5%9e%8b%e5%88%a4%e6%96%ad","status":"publish","type":"post","link":"https:\/\/gjweb.top\/?p=270","title":{"rendered":"JS\u7c7b\u578b\u5224\u65ad"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">typeof()<\/h2>\n\n\n\n<p>\u7c7b\u578b\u68c0\u67e5\u53ea\u652f\u6301 \u57fa\u672c\u6570\u636e\u7c7b\u578b + undefined + function<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>console.log(typeof 1) \/\/ number<br>console.log(typeof true) \/\/ boolean<br>console.log(typeof \"str\") \/\/ string<br>console.log(typeof undefined) \/\/ undefined<br>console.log(typeof null) \/\/ object<br>console.log(typeof function(){}) \/\/ function<br>console.log(typeof &#91;1,2,3]) \/\/ object<br>console.log(typeof {name:\"xxx\"}) \/\/ object<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">instanceof<\/h2>\n\n\n\n<p>\u7c7b\u578b\u68c0\u67e5\u53ea\u652f\u6301 \u5f15\u7528\u7c7b\u578b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>console.log( 1 instanceof Number) \/\/ false<br>console.log( 'str' instanceof String) \/\/ fasle<br>console.log( true instanceof Boolean) \/\/ false<br>console.log( &#91;1,2,3] instanceof Array) \/\/ true<br>console.log( function(){} instanceof Function) \/\/ true<br>console.log( {} instanceof Object) \/\/ true<br>console.log( null instanceof Object) \/\/ fasle<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Object.prototype.toString.call()<\/h2>\n\n\n\n<p>\u652f\u6301\u6240\u6709\u7c7b\u578b\u7684\u68c0\u67e5\uff0c \u7f3a\u70b9\u662f\u8bed\u6cd5\u592a\u957f\u4e86<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var start = Object.prototype.toString<br>console.log(start.call(1))<br>console.log(start.call(\"111\"))<br>console.log(start.call(true))<br>console.log(start.call(undefined))<br>console.log(start.call({}))<br>console.log(start.call(function(){}))<br>console.log(start.call(&#91;1,2,3]))<br>console.log(start.call(null))<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>typeof() \u7c7b\u578b\u68c0\u67e5\u53ea\u652f\u6301 \u57fa\u672c\u6570\u636e\u7c7b\u578b + undefined + function instance [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-270","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts\/270","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=270"}],"version-history":[{"count":0,"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts\/270\/revisions"}],"wp:attachment":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=270"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=270"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=270"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}