function Super(){    this.name = "this is super";}Super.prototype = {    say:function(){        console.log(this.name);    }}function Sub(){    this.name = "this is sub";}Sub.prototype = new Super();var o = new Sub();o.say(); //this is sub實例 o 的原型對象的constructor是Super，那么 this.name 應該是Super的構造函數。但是輸出是 this is sub