<html> <head> <script> function extend(Child,Parent){ var F = function(){}; F.prototype = Parent.prototype; Child.prototype=new F(); Child.prototype.constructor=Child; Child.uber=Parent.prototype; } function Shape() {} Shape.prototype.name = ‘Shape‘; Shape.prototype.toString = function () { return this.constructor.uber ? this.constructor.uber.toString() + ‘, ‘ + this.name : this.name; }; function TwoDShape() {} extend(TwoDShape,Shape); TwoDShape.prototype.name = ‘2D shape‘; function Triangle(side, height) { this.side = side; this.height = height; } extend(Triangle,TwoDShape); Triangle.prototype.name = ‘Triangle‘; Triangle.prototype.getArea = function () { return this.side * this.height / 2; }; function myclick(){ var my = new Triangle(); console.log(my.toString()); } </script> </head> <body> <div style="width:100px;height:100px;background:red;" onclick="myclick()"></div> </body> </html>
原文：http://www.cnblogs.com/zhangwei595806165/p/5397869.html