/*
工廠方式--- 創(chuàng)建并返回特定類型的對(duì)象的 工廠函數(shù) （ factory function ）
*/
function createCar(color,doors,mpg){
var tempCar = new Object;
tempCar.color = color;
tempCar.doors = doors;
tempCar.mpg = mpg;
tempCar.showCar = function(){
alert(this.color + " " + this.doors);
}
return tempCar;
}

/*
構(gòu)造函數(shù)方式--- 構(gòu)造函數(shù)看起來很像工廠函數(shù)
*/
function Car(color,doors,mpg){
this.color = color;
this.doors = doors;
this.mpg = mpg;
this.showCar = function(){
alert(this.color);
};
}
/*
原型方式--- 利用了對(duì)象的 prototype 屬性，可把它看成創(chuàng)建新對(duì)象所依賴的原型
*/
function Car(color,doors,mpg){
this.color = color;
this.doors = doors;
this.mpg = mpg;
this.drivers = new Array("nomad","angel");
}

Car.prototype.showCar3 = function(){
alert(this.color);
};

/*
混合的構(gòu)造函數(shù) /原型方式--- 用構(gòu)造函數(shù)定義對(duì)象的所有非函數(shù)屬性，用原型方式定義對(duì)象的函數(shù)屬性（方法）
*/
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);
};
/*
動(dòng)態(tài)原型方法--- 在構(gòu)造函數(shù)內(nèi)定義非函數(shù)屬性，而函數(shù)屬性則利用原型屬性定義。唯一的區(qū)別是賦予對(duì)象方法的位置。
*/
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;
}
} //該方法使用標(biāo)志（ _initialized ）來判斷是否已給原型賦予了任何方法。