javascript中几种变量类型判断
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Type?typeof?instance?toStringNumber?var n = 1?number?false?[object Number] ?var n = Number(1)?number?false?[object Number] ?var n = new Number(1)?object?true?[object Number]String?var s = "s"?string?false?[object String] ?var s = String("s")?string?false?[object String] ?var s = new String("s")?object?true?[object String]Boolean?var b = ture?boolean?false?[object Boolean] ?var b = Boolean(true)?boolean?false?[object Boolean] ?var b = new Boolean(true)?object?true?[object Boolean]null?var nu = n ull?object?false?[object global]undefined?var u = undefined?undefined?false?[object global]Array?var a = []?object?true?[object Array] ?var a = Array()?object?true?[object Array] ?var a = new Array()?object?true?[object Array]RegExpvar r = /^$/function? ?var r = RegExp("^$")function? ?var r = new RegExp("^$")function?Object?var o = {}?object?true?[object Object] ?var o = Object()?object?true?[object Object] ?var o = new Object()?object?true?[object Object]Function?var f = function(){}?function?true?[object Function] ?function f(){}?function?true?[object Function] ?var f = new Function()?function?true?[object Function]?
