{"id":12158,"date":"2023-11-28T22:45:13","date_gmt":"2023-11-28T14:45:13","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=12158"},"modified":"2023-11-29T23:29:34","modified_gmt":"2023-11-29T15:29:34","slug":"javascript-zhong-pan-duan-shu-ju-lei-xing-de-fang","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/javascript-zhong-pan-duan-shu-ju-lei-xing-de-fang\/","title":{"rendered":"JavaScript \u4e2d\u5224\u65ad\u6570\u636e\u7c7b\u578b\u7684\u65b9\u6cd5\u6709\u54ea\u4e9b\uff1f"},"content":{"rendered":"<p>\u5728 JavaScript \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\u6765\u5224\u65ad\u6570\u636e\u7684\u7c7b\u578b\uff1a<\/p>\n<ol>\n<li>\n<p><strong>typeof \u64cd\u4f5c\u7b26<\/strong>\uff1a\u7528\u4e8e\u786e\u5b9a\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b\u3002\u5b83\u8fd4\u56de\u4e00\u4e2a\u8868\u793a\u64cd\u4f5c\u6570\u7c7b\u578b\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<pre><code class=\"language-javascript\">typeof 42; \/\/ \u8fd4\u56de 'number'\ntypeof 'hello'; \/\/ \u8fd4\u56de 'string'\ntypeof true; \/\/ \u8fd4\u56de 'boolean'\ntypeof undefined; \/\/ \u8fd4\u56de 'undefined'\ntypeof null; \/\/ \u8fd4\u56de 'object'\uff08\u8fd9\u662f typeof \u7684\u4e00\u4e2a\u5386\u53f2\u9057\u7559\u95ee\u9898\uff09\ntypeof {}; \/\/ \u8fd4\u56de 'object'\ntypeof []; \/\/ \u8fd4\u56de 'object'\ntypeof function() {}; \/\/ \u8fd4\u56de 'function'\n<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>instanceof \u64cd\u4f5c\u7b26<\/strong>\uff1a\u7528\u4e8e\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u662f\u67d0\u4e2a\u6784\u9020\u51fd\u6570\u7684\u5b9e\u4f8b\u3002<\/p>\n<pre><code class=\"language-javascript\">const arr = [];\narr instanceof Array; \/\/ \u8fd4\u56de true\nconst obj = {};\nobj instanceof Object; \/\/ \u8fd4\u56de true\n<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>Object.prototype.toString.call() \u65b9\u6cd5<\/strong>\uff1a\u53ef\u4ee5\u8fd4\u56de\u4e00\u4e2a\u66f4\u51c6\u786e\u7684\u7c7b\u578b\u4fe1\u606f\uff0c\u9002\u7528\u4e8e\u6240\u6709\u6570\u636e\u7c7b\u578b\u3002<\/p>\n<pre><code class=\"language-javascript\">Object.prototype.toString.call(42); \/\/ \u8fd4\u56de '[object Number]'\nObject.prototype.toString.call('hello'); \/\/ \u8fd4\u56de '[object String]'\nObject.prototype.toString.call(true); \/\/ \u8fd4\u56de '[object Boolean]'\nObject.prototype.toString.call(undefined); \/\/ \u8fd4\u56de '[object Undefined]'\nObject.prototype.toString.call(null); \/\/ \u8fd4\u56de '[object Null]'\nObject.prototype.toString.call({}); \/\/ \u8fd4\u56de '[object Object]'\nObject.prototype.toString.call([]); \/\/ \u8fd4\u56de '[object Array]'\nObject.prototype.toString.call(function() {}); \/\/ \u8fd4\u56de '[object Function]'\n<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>Array.isArray() \u65b9\u6cd5<\/strong>\uff1a\u7528\u4e8e\u68c0\u67e5\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u4e3a\u6570\u7ec4\u3002<\/p>\n<pre><code class=\"language-javascript\">Array.isArray([]); \/\/ \u8fd4\u56de true\nArray.isArray({}); \/\/ \u8fd4\u56de false\n<\/code><\/pre>\n<\/li>\n<\/ol>\n<p>\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u7684\u9700\u6c42\u6765\u5224\u65ad\u6570\u636e\u7c7b\u578b\uff0c\u9009\u62e9\u6700\u9002\u5408\u7684\u65b9\u6cd5\u8fdb\u884c\u5224\u65ad\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 JavaScript \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\u6765\u5224\u65ad\u6570\u636e\u7684\u7c7b\u578b\uff1a typeof \u64cd\u4f5c\u7b26\uff1a\u7528\u4e8e\u786e\u5b9a\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115,99],"tags":[],"class_list":["post-12158","post","type-post","status-publish","format-standard","hentry","category-javascript","category-javabase"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12158","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=12158"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12158\/revisions"}],"predecessor-version":[{"id":13596,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12158\/revisions\/13596"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=12158"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=12158"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=12158"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}