动态原型方法：在构造函数内定义非函数属性，而函数属性则利用原型属性定义。

function Car(sColor,iDoors,iMpg)
    {
        this.color=sColor;
        this.doors=iDoors;
        this.mpg=iMpg;
        this.drivers=new Array("Mike","Sue");
        
        if(typeof Car._initialized=="undefined")
        {
            Car.prototype.showcolor=function()
            {
                alert(this.color);
            };
            Car._initialized=true;
        }
    }


 function test()
    {
       var oCar1=new Car("red",4,23);
       alert(oCar1.drivers);
       oCar1.showcolor();
    }

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