{"id":3120,"date":"2018-10-29T11:41:06","date_gmt":"2018-10-29T03:41:06","guid":{"rendered":"http:\/\/www.daliane.com\/?p=3120"},"modified":"2018-10-29T11:43:03","modified_gmt":"2018-10-29T03:43:03","slug":"js_pan_duan_ge_zhong_shu_ju_lei_xing","status":"publish","type":"post","link":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/js_pan_duan_ge_zhong_shu_ju_lei_xing\/","title":{"rendered":"js \u5224\u65ad\u5404\u79cd\u6570\u636e\u7c7b\u578b"},"content":{"rendered":"

\n\t\u4e86\u89e3js\u7684\u90fd\u77e5\u9053\uff0c \u6709\u4e2atypeof  \u7528\u6765\u5224\u65ad\u5404\u79cd\u6570\u636e\u7c7b\u578b,\u6709\u4e24\u79cd\u5199\u6cd5\uff1atypeof   xxx   ,typeof(xxx)\n<\/p>\n

\n\t       \u5982\u4e0b\u5b9e\u4f8b\uff1a\n<\/p>\n

\n\t       typeof   2      \u8f93\u51fa   number
\n       typeof   null   \u8f93\u51fa   object<\/span>\n<\/p>\n

\n\t       typeof   {}    \u8f93\u51fa   object<\/span>\n<\/p>\n

\n\t       typeof    []    \u8f93\u51fa   object<\/span><\/span>\n<\/p>\n

\n\t       typeof   (function(){})   \u8f93\u51fa  function\n<\/p>\n

\n\t       typeof    undefined         \u8f93\u51fa  undefined<\/span>\n<\/p>\n

\n\t       typeof   ‘222’                 \u8f93\u51fa    string<\/span>\n<\/p>\n

\n\t      typeof  true                   \u8f93\u51fa     boolean<\/span><\/span><\/span>\n<\/p>\n

\n\t    \u8fd9\u91cc\u9762\u5305\u542b\u4e86js\u91cc\u9762\u7684\u4e94\u79cd\u6570\u636e\u7c7b\u578b  number   string    boolean   undefined     object\u548c\u51fd\u6570\u7c7b\u578b function<\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t     \u770b\u5230\u8fd9\u91cc\u4f60\u80af\u5b9a\u4f1a\u95ee\u4e86\uff1a\u6211\u600e\u4e48\u53bb\u533a\u5206\u5bf9\u8c61\uff0c\u6570\u7ec4\u548cnull\u5462?<\/span>\n<\/p>\n

\n\t     \u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u7528\u5230\u53e6\u5916\u4e00\u4e2a\u5229\u5668\uff1aObject.prototype.toString.call<\/span>\n<\/p>\n

\n\t     \u8fd9\u662f\u5bf9\u8c61\u7684\u4e00\u4e2a\u539f\u751f\u539f\u578b\u6269\u5c55\u51fd\u6570,\u7528\u6765\u66f4\u7cbe\u786e\u7684\u533a\u5206\u6570\u636e\u7c7b\u578b\u3002<\/span>\n<\/p>\n

\n\t     \u6211\u4eec\u6765\u8bd5\u8bd5\u8fd9\u4e2a\u73a9\u513f\u610f\u513f\uff1a<\/span>\n<\/p>\n

\n\t     var   gettype=Object.prototype.toString<\/span><\/span>\n<\/p>\n

\n\t        gettype.call(‘aaaa’)        \u8f93\u51fa      [object String]<\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t        gettype.call(2222)         \u8f93\u51fa      [object Number]<\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t        gettype.call(true)          \u8f93\u51fa      [object Boolean]<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t        gettype.call(undefined)  \u8f93\u51fa      [object Undefined]<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t        gettype.call(null)                  \u8f93\u51fa   [object Null]<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t         gettype.call({})                   \u8f93\u51fa   [object Object]<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t         gettype.call([])                    \u8f93\u51fa   [object Array]
\n         gettype.call(function(){})     \u8f93\u51fa   [object Function]<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t      \u770b\u5230\u8fd9\u91cc\uff0c\u521a\u624d\u7684\u95ee\u9898\u6211\u4eec\u89e3\u51b3\u4e86\u3002 
\n<\/span>\n<\/p>\n

\n\t     constructor\u4e5f\u80fd\u5224\u65ad\u6570\u636e\u7c7b\u578b\uff1a<\/span>\n<\/p>\n

\n\t     \u5982:”.constructor==String    \n<\/p>\n

\n\t           [].constructor==Array<\/span>\n<\/p>\n

\n\t           var obj= new Object()   obj.constructor==Object<\/span>\n<\/p>\n

\n\t      \u5176\u5b9ejs \u91cc\u9762\u8fd8\u6709\u597d\u591a\u7c7b\u578b\u5224\u65ad      [object HTMLDivElement]     div \u5bf9\u8c61  ,    [object HTMLBodyElement]  body \u5bf9\u8c61    ,[object Document](IE)\u6216\u8005  [object HTMLDocument]\uff08firefox,google\uff09 ……\u5404\u79cddom\u8282\u70b9\u7684\u5224\u65ad\uff0c\u8fd9\u4e9b\u4e1c\u897f\u5728\u6211\u4eec\u5199\u63d2\u4ef6\u7684\u65f6\u5019\u90fd\u4f1a\u7528\u5230\u3002<\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t     \u53ef\u4ee5\u5c01\u88c5\u7684\u65b9\u6cd5\u5982\u4e0b  \uff1a<\/span>\n<\/p>\n

\n\t      var   gettype=Object.prototype.toString<\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t     var    utility={<\/span>\n<\/p>\n

\n\t          isObj:function(o){<\/span>\n<\/p>\n

\n\t               return    gettype.call(o)==”[object Object]”;<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t          },<\/span>\n<\/p>\n

\n\t          isArray:function(o){<\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t               return    gettype.call(o)==”[object Array]”;<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t          },<\/span>\n<\/p>\n

\n\t          isNULL:function(o){<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t               return    gettype.call(o)==”[object Null]”;<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t          },<\/span>\n<\/p>\n

\n\t          isDocument:function(){<\/span>\n<\/p>\n

\n\t                return    gettype.call(o)==”[object Document]”|| [object HTMLDocument];<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\n<\/p>\n

\n\t          }<\/span>\n<\/p>\n

\n\t          ……..<\/span>\n<\/p>\n

\n\t    }<\/span>\n<\/p>\n

\n\t
\n<\/span>\n<\/p>\n

\n\t <\/span>\n<\/p>\n

var Type = (function() {\r\n                var type = {};\r\n                var typeArr = ['String', 'Object', 'Number', 'Array','Undefined', 'Function', 'Null', 'Symbol'];\r\n                for (var i = 0; i < typeArr.length; i++) {\r\n                    (function(name) {\r\n                        type['Is' + name] = function(obj) {\r\n                            return Object.prototype.toString.call(obj) == '[object ' + name + ']';\r\n                        }\r\n                    })(typeArr[i]);\r\n                }\r\n                return type;\r\n})();<\/pre>\n
<\/p>\n
\n\t<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3js\u7684\u90fd\u77e5\u9053\uff0c \u6709\u4e2atypeof  \u7528\u6765\u5224\u65ad\u5404\u79cd\u6570\u636e\u7c7b\u578b,\u6709\u4e24\u79cd\u5199\u6cd5\uff1atyp…<\/p>\n","protected":false},"author":2,"featured_media":228,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[38],"tags":[],"_links":{"self":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/3120"}],"collection":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/comments?post=3120"}],"version-history":[{"count":2,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/3120\/revisions"}],"predecessor-version":[{"id":3122,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/3120\/revisions\/3122"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media\/228"}],"wp:attachment":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media?parent=3120"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/categories?post=3120"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/tags?post=3120"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}