function SuperType(name){

        this.color = ["yellow","green"];

        this.name  = name;

        this.getName = function(){

            return this.name;

        };

    }

    function SubType(name){

        SuperType.call(this,name);

    }

    var instance  = new SubType("xiaodong");

    instance.color.push("black");

    var instance2 = new SubType();

    console.log(instance.color);//["yellow", "green", "black"]

    console.log(instance.name);//xiaodong

    console.log(instance2.color);// ["yellow", "green"]

    console.log(instance.getName == instance2.getName);//false 方法没有达到共用

    //借用构造函数解决了属性值共享的问题,以及实例向超级类传递参数的问题. 缺点 方法也是在函数中定义 无法解决函数共用的问题