var a=function(){
this.che1 = function () { console.log(1) }
this.che2 = function () { console.log(2) }
this.che3=function(){console.log(3)}
}
var b= new a();
var c={};
c.__proto__ = a.prototype;
a.call(c);
console.log(b)
console.log(c)
原文：https://www.cnblogs.com/dianzan/p/10899045.html