js Object.prototype.toString.app

Object.prototype.toString.apply([1,2]) //"[object Array]"

Object.prototype.toString.apply('str')    //"[object String]"

Object.prototype.toString.apply(1)        //"[object Number]"

Object.prototype.toString.apply(null)    //"[object Null]"

Object.prototype.toString.apply()        //"[object Undefined]"

Object.prototype.toString.apply(function(){})      //"[object Function]"

Object.prototype.toString.apply(true)    //"[object Boolean]"

Object.prototype.toString.apply(new Object())    //"[object Object]"

引用链接：https://www.cnblogs.com/carolineshen/p/8483444.html