JS----多态

理解就是一个 引用类型 (对象/变量) 在不同情况下的多种状态

js 本身是无态,但js天生就支持多态

<script type="text/javascript">
	// Master类
	function Master(name){
		this.nam=name;
	}
	//原型法添加成员函数
	Master.prototype.feed=function (animal,food){		
		window.alert("给"+animal.name+" 喂:"+ food.name);
	}

	//食物类
	function Food(name){
		this.name=name;
	}
	//动物类
	function Animal(name){
		this.name=name;
	}
	
	
	//鱼类
	function Fish(name){
		this.food=Food;
		this.food(name);
	}

	//骨头
	function Bone(name){
		this.food=Food;
		this.food(name);
	}

	//猫猫
	function Cat(name){
		this.animal=Animal;
		this.animal(name);
	}
	//狗狗
	function Dog(name){
		this.animal=Animal;
		this.animal(name);
	}
	
	var cat=new Cat("猫");
	var fish=new Fish("鱼");

	var dog=new Dog("狗");
	var bone=new Bone("骨头");
	
	
	
	//创建一个主人
	var master=new Master("Jake");
	master.feed(cat,fish);//给猫喂..鱼
	master.feed(dog,bone);//给狗喂..骨头
	

</script>