Object.prototype.toString.call()和typeof()区别

js中判断数据类型都知道用tyoeof()，但是他只能判断object，boolean，function，string，number，undefined还有symbol(es6新增)这几种初步类型，比如new Date和null，它就只能是object。

console.log(typeof(new Date()))； // object

console.log(typeof(null))；// object

console.log(typeof([1,2,3]))；// object

那么，我们使用Object.prototype.toString.call()，就可以做到

console.log(Object.prototype.toString.call("jerry"));//[object String]

console.log(Object.prototype.toString.call(12));//[object Number]

console.log(Object.prototype.toString.call(true));//[object Boolean]

console.log(Object.prototype.toString.call(undefined));//[object Undefined]

console.log(Object.prototype.toString.call(null));//[object Null]

console.log(Object.prototype.toString.call({name: "jerry"}));//[object Object]

console.log(Object.prototype.toString.call(function(){}));//[object Function]

console.log(Object.prototype.toString.call([]));//[object Array]

console.log(Object.prototype.toString.call(new Date));//[object Date]

console.log(Object.prototype.toString.call(/\d/));//[object RegExp]

function Person(){}; console.log(Object.prototype.toString.call(new Person));//[object Object]

判断console.log(Object.prototype.toString.call(new Person) === '[object Object]'); //true