在js中如果想判断某种数据的数据类型，一般使用typeof方法
var str = "string";var num = 1;var bool = true;var u;var n = null;var nan = NaN;var obj = new Object();var fn = function () {};console.log(typeof str); //stringconsole.log(typeof num); //numberconsole.log(typeof bool); //booleanconsole.log(typeof u); //undefinedconsole.log(typeof n); //objectconsole.log(typeof nan); //numberconsole.log(typeof obj); //objectconsole.log(typeof fn); //function注：NaN的类型是number
但是如果是数组、对象或者正则用typeof方法则无法区分
var arr = [1,2];var obj = {};var reg = /^\d{11}$/;console.log(typeof arr); //objectconsole.log(typeof obj); //objectconsole.log(typeof reg); //object
因为所有引用类型的值都是Object的实例，所以要判断引用类型的具体数据类型要使用instanceof方法:
var arr = [1,2];var obj = {};var reg = /^\d{11}$/;console.log(arr instanceof Array) //trueconsole.log(obj instanceof Object); //trueconsole.log(reg instanceof RegExp); //true
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