混合构造函数,  就是 原型模式+普通构造函数方式

构造函数 定义对象的非函数属性.

原型方式  定义 对象的函数属性(方法)

function Car(sColor,iDoors,iMpg) {  this.color = sColor;  this.doors = iDoors;  this.mpg = iMpg;  this.drivers = new Array("Mike","John");}Car.prototype.showColor = function() {  alert(this.color);};var oCar1 = new Car("red",4,23);var oCar2 = new Car("blue",3,25);oCar1.drivers.push("Bill");alert(oCar1.drivers);    //输出 "Mike,John,Bill"alert(oCar2.drivers);    //输出 "Mike,John"

下面说下动态原型:

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

不管实例化多少个 car对象,那么 showColor函数 只初始化一次.