订阅一.工廠方式：先創建對象，再向對象添加方法和屬性，封閉後調用不要使用new操作符創建對象。使用這種方法有很多弊端，把方法定義在工廠函數內部的時候，每次調用的時候都會産生新的函數
function factory(name,person,address,time){
var tmp=new Object;
tmp.name=name;
tmp.person=person;
tmp.address=address;
tmp.workTime=function(){
alert("we start to work at" + time);
}
return tmp;
}
var factory1=factory("drugs",100,"huashan Rd",10);
var factory2=factory("TCMdrugs",100,"hongqiao Rd",11);
factory1.workTime();
factory2.workTime();//Here,factory1 and factory2 have different method
對這種問題雖然可以用下面的方式改進，但是缺乏很好的封裝性
function factory(name,person,address,time){
var tmp=new Object;
tmp.name=name;
tmp.person=person;
tmp.address=address;
tmp.workTime=workTime();
return tmp;
}
function workTime(){
alert("we start to work at" + this.time);
}
二，構造函數方式，在構造函數內部不創建對象，使用this關鍵字，使用時候用new操作符，存在和工廠方式相同的問題，重複創建函數。
function counstruct(name,person,address,time){
this.name=name;
this.person=person;
this.address=address;
this.workTime=function(){
alert("we start to work at" + this.time);
};
}
三.原型方式：利用prototype屬性來實現屬性和方法，可以通過instanceof 檢查對象類型，解決了重複創建函數的問題，但不能通過傳遞參數初始化屬性
function Car(){
}
Car.prototype.color = "red";
Car.prototype.doors = 4;
Car.prototype.mpg = 23;
Car.prototype.showColor = function(){
alert(this.color);
};
var car1 = new Car();
var car2 = new Car();
但是如果遇到下面的情況，又出問題了
Car.prototype.drivers = new Array("mike", "sue");
car1.drivers.push("matt");
alert(car1.drivers); //outputs "mike,sue,matt"
alert(car2.drivers); //outputs "mike,sue,matt"
drivers是指向Array對象的指針，Car的兩個實例都指向同一個數組。
四.混合的構造函數/原型方式:針對原型方式的解決方案
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);
五.動態原型方式:這種方式是極力推薦的方式，避免了前面幾種方式所出現的問題，提供了更友好的編碼風格
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;
}
}
var car1 = new Car("red", 4, 23);
var car2 = new Car("blue", 3, 25);
car1.drivers.push("matt");
alert(car1.drivers);
alert(car2.drivers);
六.混合工廠方式：和工廠方式有些相似，但采用new關鍵字實例化，具有和工廠方式相同的弊端，不推薦使用
