function Shape(){}Shape.prototype.name="shape";Shape.prototype.toString=function(){ ? ?var const = this.constructor; ? ?return ?const.uber? this.const.uber.toString()+","+this.name:this.name;}function TwoDShape(){}var F=function(){};F.prototype=Shape.prototype;TwoDShape.prototype=new F();TwoDShape.prototype.constructor=TwoDShape;TwoDShape.uber=Shape.prototype;TwoDShape.prototype.name="2D shape";function Triangle(side,height) { ? ?this.side=side; ? ?this.height=height;}var F=function(){};F.prototype=TwoDShape.prototype;Triangle.prototype=new F();Triangle.prototype.constructor=Triangle;Triangle.uber=TwoDShape.prototype;Triangle.prototype.name="Triangle";Triangle.prototype.getArea=function(){ ? ?return this.side*this.height/2;};var my=new Triangle(5,10);my.toString();my沒有tostring方法，不斷的向上找，找到shape的tostring方法，輸出的第一個為this.const.uber.toString+，Triangle，接著就看不明白了，const里面有個this，前面還有個this，（這個this不多余么？）有沒有能把完整的過程解讀下的大神，小弟跪謝了/(ㄒoㄒ)/~~