即用构造函数定义对象的所有飞函数属性，用原型方式定义对象的函数属性(方法)。

Code
<script type="text/javascript">
    debugger;
    function Car(sColor, iDoors, iMpg) {
        this.color = sColor,
        this.doors = iDoors;
        this.mpg = iMpg;
        this.drivers = new Array("Mike", "Sue");
 
   
    }
   
    Car.prototype.showColor = function () {
        alert(this.color);

   
    };
    var Car1 = new Car("red", 4, 23);
    var Car2 = new Car("blue", 3, 25);
   
    Car1.drivers.push("Matt");
   
    alert(Car1.drivers);
    alert(Car2.drivers);
   
    </script>