​

 //toString()方法,与call()方法结合;用来进行数据类型检测

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

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

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

console.log(Object.prototype.toString.call(123));//'[object Number]'

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

console.log(Object.prototype.toString.call(/abc/));//'[object RegRxp]'

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

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

​