使用toString检测js数据类型

toString.call()

使用toString.call()能检测js中的数据类型，与typeof和instanceof不同，方法更简单

var obj = {}; console.log(toString.call(obj)); // [object Object] var str = 'aaa'; console.log(toString.call(str)); // [object String] var num = 123; console.log(toString.call(num)); // [object Number] var date = new Date(); console.log(toString.call(date)); // [object Date] var bool = true; console.log(toString.call(bool)); // [object Boolean] var undef = undefined; console.log(toString.call(undef)); // [object Undefined] var _null = null; console.log(toString.call(_null)); // [object Null]

数据类型一目了然