Javascript基础（三）对象继承

我的CSDN博客地址： http://blog.csdn.net/caicongyang 

1.对象冒充

//对象冒充	
	function Parent(username)
	{
		this.username = username;
	
		this.sayName = function()
		{
			alert(this.username);
		};
	}
	
	function Chlid(username,age){
		this.method = Parent;
		this.method(username);
		delete this.method;
		
		this.age = age;
		this.sayAge = function (){
			alert(this.age);
		};
	}

	var parent = new Parent("Tom1");
	parent.sayName();
	
	var chlid = new Chlid("Tom2","23");
	chlid.sayName();
	chlid.sayAge();

2.call方式

//call方式
	function Parent(username)
	{
		this.username = username;
	
		this.sayName = function()
		{
			alert(this.username);
		};
	}
	
	function Chlid(username,age){
		Parent.call(this, username);
		this.age = age;
		this.sayAge = function(){
			alert(this.age);
		};
	}

	var parent = new Parent("C");
	parent.sayName();
	
	var chlid = new Chlid("C++","25");
	chlid.sayName();
	chlid.sayAge();

3.apply方式

//apply方式
	function Parent(username)
	{
		this.username = username;
	
		this.sayName = function()
		{
			alert(this.username);
		};
	}
	
	function Chlid(username,age){
		Parent.apply(this, new Array(username));
		this.age = age;
		this.sayAge = function(){
			alert(this.age);
		};
	}

	var parent = new Parent("C");
	parent.sayName();
	
	var chlid = new Chlid("JAVA","25");
	chlid.sayName();
	chlid.sayAge();

4.propotype chain 原型链的方式

//propotyes chain 方式实现继承
	function Parent(){
	
	}
	
	Parent.prototype.name = "lisi";
	Parent.prototype.sayName = function(){
		alert(this.name);
	};
	
	function Child(){
	
	}
	Child.prototype = new Parent();
	Child.prototype.age = "18";
	Child.prototype.sayAge = function(){
		alert(this.age);
	};
	
	var parent = new Parent();
	parent.sayName();
	
	var Child = new Child();
	Child.sayName();
	Child.sayAge();

5.混合方式（推荐）

//混合方式（推荐）
	function Parent(name){
		this.name = name;
	}
	
	Parent.prototype.sayName = function(){
		alert(this.name);
	};
	
	function Child(name,age){
		Parent.call(this, name);
		this.age = age;
	};
	Child.prototype = new Parent();
	Child.prototype.sayAge = function(){
		alert(this.age);
	};
	
	var parent = new Parent("c");
	parent.sayName();
	
	var Child = new Child("java","13");
	Child.sayName();
	Child.sayAge();

我的CSDN博客地址： http://blog.csdn.net/caicongyang