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<title>javascript高级语法9-工厂模式</title>
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/*1.简单工厂 :通过第三方的类完成松耦合的任务 ->工厂。
* 2.复杂工厂:通过把实例化的任务交个子类来完成，用来达到松耦合的目的 ->工厂。
* 3.超级工厂:通过eval来完成智能工厂。
*/
/*工厂的目的在于判别接口最终用哪类来实例化、
* 产生实例的过程不用new关键字
* 最终达到的效果是多台，类与类之间的松耦合
*/ //需要用到的继承和接口方法
function extend(subClass,superClass){
//1.叫子类原型类属性等于父类的原型属性
//初始化一个中间空对象,为了转换主父类关系
var F = function(){};
F.prototype = superClass.prototype;
//2.让子类集成F
subClass.prototype = new F();
subClass.prototype.constructor = subClass;
//3.为子类增加属性superClass
subClass.superClass = superClass.prototype;
//4.增加一个保险,就算你是的原型类是超类(Object) 那么也要把你的构造函数级别讲下来
if(superClass.prototype.constructor == Object.prototype.constructor){
superClass.prototype.constructor = superClass;
}
}
//接口
var Interface = function(name,methods){
if(arguments.length != 2){
alert("interface must have two paramters...");
}
this.name = name;//这个是接口的名字
this.methods = [];//定义个空数组来转载函数名
for (var i = 0; i < methods.length; i++) {
if(typeof methods[i] != "string"){
alert("method name must is String ...")
}else{
this.methods.push(methods[i])
}
}
}
//定义接口的一个静态方法来实现接口与实现类的直接检验
//静态方法不要写成Interface.prototype.* 因为这是写到接口原型连上的
//我们要把静态的函数直接写到类层次上
Interface.ensureImplements = function(object){
if(arguments.length<2){
alert("必须最少是2个参数");
return false;
}
//遍历
for (var i = 1; i < arguments.length; i++) {
var inter = arguments[i];
//如果你是接口就必须是Interface类型的
if(inter.constructor != Interface){
throw new Error("if is interface class must is Interface type");
}
//遍历函数集合并分析
for (var j = 0; j < inter.methods.length; j++) {
var method = inter.methods[j];
//实现类中必须有方法名字 和 接口中所有的方法名项目
if(!object[method] || typeof object[method] != "function"){
throw new Error("实现类并且没有完全实现接口中的所有方法...");
}
}
}
} function factory1(){
var Pet = new Interface("Pet",["eat","run","sing","register"]);
//宠物店
var PetShop = function(){}
PetShop.prototype = {
//出售宠物的方法
sellPetShop:function(kind){
//宠物对象
var pet;
//kind种类
switch(kind){
case 'dog':
pet = new Dog();
break;
case 'cat':
pet = new Cat();
break;
case 'pig':
pet = new Pig();
break;
default:
//鸟
pet = new Bird();
}
//验证接口
Interface.ensureImplements(pet,Pet);
pet.eat();
pet.register();
return pet;
}
}
//宠物基类
function BasePet(){
this.register = function(){
document.write("宠物登记 。。。<br>")
}
this.eat = function(){
document.write("吃顿饱饭 <br>")
}
}
//实现
function Dog(){
Dog.superClass.constructor.call(this);
this.run = function(){
document.write("小狗跑步 。。<br>")
}
this.sing = function(){
document.write("小狗唱歌。。。<br>")
}
}
function Cat(){
Cat.superClass.constructor.call(this);
this.run = function(){
document.write("小猫跑步 。。<br>")
}
this.sing = function(){
document.write("小猫唱歌。。。<br>")
}
}
function Pig(){
Pig.superClass.constructor.call(this);
this.run = function(){
document.write("小猪跑步 。。<br>")
}
this.sing = function(){
document.write("小猪唱歌。。。<br>")
}
}
function Bird(){
Bird.superClass.constructor.call(this);
this.run = function(){
document.write("小鸟跑步 。。<br>")
}
this.sing = function(){
document.write("小鸟唱歌。。。<br>")
}
} //继承
extend(Dog,BasePet);
extend(Pig,BasePet);
extend(Bird,BasePet);
extend(Cat,BasePet); //pcat宠物店
var pcatPetShop = new PetShop();
var flowerPig = pcatPetShop.sellPetShop("pig");
flowerPig.run(); /*貌似很完美，但是他禁不住需求的变化
* 比如说宠物商店又进来一些新的品种宠物
* 这时候用目前的方法必须要修改宠物商店这个类
* 用一个简单工厂来解决
*/ }
// factory1(); function factory2(){
//静态工厂
var Pet = new Interface("Pet",["eat","run","sing","register"]);
var PetFactory = {
sellPetShop:function(kind){
//宠物对象
var pet;
//kind种类
switch(kind){
case 'dog':
pet = new Dog();
break;
case 'cat':
pet = new Cat();
break;
case 'pig':
pet = new Pig();
break;
default:
//鸟
pet = new Bird();
}
//验证接口
Interface.ensureImplements(pet,Pet);
return pet;
}
}
//利用工厂的新宠物店
var PetShop2 = function(){}
PetShop2.prototype = {
sellPetShop:function(kind){
var pet = PetFactory.sellPetShop(kind);
pet.eat();
pet.register();
return pet;
}
} //宠物基类
function BasePet(){
this.register = function(){
document.write("宠物登记 。。。<br>")
}
this.eat = function(){
document.write("吃顿饱饭 <br>")
}
}
//实现
function Dog(){
Dog.superClass.constructor.call(this);
this.run = function(){
document.write("小狗跑步 。。<br>")
}
this.sing = function(){
document.write("小狗唱歌。。。<br>")
}
}
function Cat(){
Cat.superClass.constructor.call(this);
this.run = function(){
document.write("小猫跑步 。。<br>")
}
this.sing = function(){
document.write("小猫唱歌。。。<br>")
}
}
function Pig(){
Pig.superClass.constructor.call(this);
this.run = function(){
document.write("小猪跑步 。。<br>")
}
this.sing = function(){
document.write("小猪唱歌。。。<br>")
}
}
function Bird(){
Bird.superClass.constructor.call(this);
this.run = function(){
document.write("小鸟跑步 。。<br>")
}
this.sing = function(){
document.write("小鸟唱歌。。。<br>")
}
} //继承
extend(Dog,BasePet);
extend(Pig,BasePet);
extend(Bird,BasePet);
extend(Cat,BasePet); var pcatPetShop2 = new PetShop2();
var flowerCat = pcatPetShop2.sellPetShop("cat");
flowerCat.sing(); /*貌似很完美
* 新的需求：都是宠物店
* 张三的店主要卖哈士奇，李四的店卖各种鸟
*/
} // factory2(); function factory3(){
var Pet = new Interface("Pet",["eat","run","sing","register"]);
//宠物店
var PetShop = function(){}
PetShop.prototype = {
//出售宠物的方法
sellPetShop:function(kind){
//宠物对象
var pet;
//kind种类
switch(kind){
case 'dog':
pet = new Dog();
break;
case 'cat':
pet = new Cat();
break;
case 'pig':
pet = new Pig();
break;
default:
//鸟
pet = new Bird();
}
//验证接口
Interface.ensureImplements(pet,Pet);
pet.eat();
pet.register();
return pet;
}
}
//宠物基类
function BasePet(){
this.register = function(){
document.write("宠物登记 。。。<br>")
}
this.eat = function(){
document.write("吃顿饱饭 <br>")
}
}
//实现
function Dog(){
Dog.superClass.constructor.call(this);
this.run = function(){
document.write("小狗跑步 。。<br>")
}
this.sing = function(){
document.write("小狗唱歌。。。<br>")
}
}
function Cat(){
Cat.superClass.constructor.call(this);
this.run = function(){
document.write("小猫跑步 。。<br>")
}
this.sing = function(){
document.write("小猫唱歌。。。<br>")
}
}
function Pig(){
Pig.superClass.constructor.call(this);
this.run = function(){
document.write("小猪跑步 。。<br>")
}
this.sing = function(){
document.write("小猪唱歌。。。<br>")
}
}
function Bird(){
Bird.superClass.constructor.call(this);
this.run = function(){
document.write("小鸟跑步 。。<br>")
}
this.sing = function(){
document.write("小鸟唱歌。。。<br>")
}
} //继承
extend(Dog,BasePet);
extend(Pig,BasePet);
extend(Bird,BasePet);
extend(Cat,BasePet); //1.把核心的商店变成一个抽象类
var Petshop = function(){}
Petshop.prototype = {
sellPetShop:function(kind){
var pet = this.sellPetshop(kind);
pet.eat();
pet.register();
return pet;
},
sellPetshop:function(model){
throw new Error("this is abstract class")
}
}
//2.利用子类满足上边的需求(多态)
var OnePetShop = function(){}
extend(OnePetShop,Petshop);
OnePetShop.prototype.sellPetshop = function(model){
var pet;
//kind种类
switch(model){
case 'dog':
pet = new Dog();
break;
default:
//鸟
pet = new Bird();
}
//验证接口
Interface.ensureImplements(pet,Pet);
pet.eat();
pet.register();
return pet;
} var TwoPetShop = function(){}
extend(TwoPetShop,Petshop);
TwoPetShop.prototype.sellPetshop = function(model){
var pet;
//kind种类
switch(model){
case 'pig':
pet = new Pig();
break;
default:
//鸟
pet = new Bird();
}
//验证接口
Interface.ensureImplements(pet,Pet);
pet.eat();
pet.register();
return pet;
} //实验
var jim = new OnePetShop();
var dog = jim.sellPetshop("dog");
dog.run(); var tom = new TwoPetShop();
var pig = tom.sellPetshop("pig");
pig.run();
} // factory3(); function factory4(){
var Pet = new Interface("Pet",["eat","run","sing","register"]);
//宠物基类
function BasePet(){
this.register = function(){
document.write("宠物登记 。。。<br>")
}
this.eat = function(){
document.write("吃顿饱饭 <br>")
}
}
//实现
function Dog(){
Dog.superClass.constructor.call(this);
this.run = function(){
document.write("小狗跑步 。。<br>")
}
this.sing = function(){
document.write("小狗唱歌。。。<br>")
}
}
function Cat(){
Cat.superClass.constructor.call(this);
this.run = function(){
document.write("小猫跑步 。。<br>")
}
this.sing = function(){
document.write("小猫唱歌。。。<br>")
}
}
function Pig(){
Pig.superClass.constructor.call(this);
this.run = function(){
document.write("小猪跑步 。。<br>")
}
this.sing = function(){
document.write("小猪唱歌。。。<br>")
}
}
function Bird(){
Bird.superClass.constructor.call(this);
this.run = function(){
document.write("小鸟跑步 。。<br>")
}
this.sing = function(){
document.write("小鸟唱歌。。。<br>")
}
} //继承
extend(Dog,BasePet);
extend(Pig,BasePet);
extend(Bird,BasePet);
extend(Cat,BasePet); //智能工厂
var PetFactory = {
sellPetShop:function(kind){
var pet;
pet= eval("new "+kind +"()");
Interface.ensureImplements(pet,Pet);//在工厂中验证接口关系。
return pet;
}
} //1.把核心的商店变成一个抽象类
var Petshop = function(){}
Petshop.prototype = {
sellPetShop:function(kind){
var pet = this.sellPetshop(kind);
pet.eat();
pet.register();
return pet;
},
sellPetshop:function(model){
throw new Error("this is abstract class")
}
}
//2.利用子类满足上边的需求(多态)
var OnePetShop = function(){}
extend(OnePetShop,Petshop);
OnePetShop.prototype.sellPetshop = function(model){
var pet=null;
var pets = ["Dog","Cat","Bird"];
for( v in pets){
if(pets[v] == model){
pet = PetFactory.sellPetShop(model);
// Interface.ensureImplements(pet,Pet);
pet.eat();
pet.register();
break;
}
}
return pet;
} var TwoPetShop = function(){}
extend(TwoPetShop,Petshop);
TwoPetShop.prototype.sellPetshop = function(model){
var pet=null;
var pets = ["Pig"];
for( v in pets){
if(pets[v] == model){
pet = PetFactory.sellPetShop(model);
// Interface.ensureImplements(pet,Pet);
pet.eat();
pet.register();
break;
}
}
return pet;
} //测试
var twoPetShop = new TwoPetShop();
twoPetShop.sellPetshop("Pig"); var jim = new OnePetShop();
jim.sellPetshop("Dog");
// jim.sellPetShop("Pig");
}
factory4();
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