iframe-proxy | Sunbelt Computer Software

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
		<title>object5</title>
		<meta name="author" content="Administrator" />
		<!-- Date: 2016-04-10 -->
		<script type="text/javascript" charset="utf-8">
			// 1 JSON方式定义类
			var MoneyCountevent = {
				eventid : 1,
				save : function(){
					return "saving..";
			var moneyCountevent = new MoneyCountevent();  // 无法创建实例
			alert(moneyCountevent.eventid);
			alert(moneyCountevent.save());
			// 2 工厂方式
			function factory(objectName){
				var o = new Object();
				o.name = objectName;
				o.say = function(){
					return "my name is "+this.name;
				return o;
			var o1 = factory("o1");
			alert(o1.name);
			alert(o1.say());
			// 问题：每创建一个对象，对象的方法是新对象，浪费资源
			// 3 构造函数方式
			function construtor(objectName){
				this.name = objectName ;
				this.say = function(){
					return "my name is "+this.name;
			var o1 = new construtor("o1");
			alert(o1.name);
			alert(o1.say());
			// 问题：创建对象时比工厂方法更于理解。和工厂方法一样，每个对象都有自己的方法，浪费资源.
			// 4 原型方式
			function Clazz(){
				Clazz.prototype.name = "";
				Clazz.prototype.say = function(){
					return "my name is "+this.name;
			var o1 = new Clazz("o1");
			var o2 = new Clazz("o1");
			alert(o1.name);
			alert(o1.say()==o2.say());  // true 
			// 问题：无法在构造方法中传递参数，所有对象共享属性。
			// 优点：对象共用方法，节约资源的。
			// 5 构造函数 + 原型
			function Clazz(name){
				this.name = name;
			Clazz.prototype.say = function(){
				return "my name is "+this.name;
			var o1 = new Clazz("o1");
			var o2 = new Clazz("o1");
			alert(o1.name);
			alert(o1.say ==o2.say ); // true
			// 优点：解决了前面提到的问题
			// 问题：封装不够完美。
			// 6 动态原型
			function Clazz(name){
				this.name = name;
				if(Clazz.prototype.say == undefined){
					Clazz.prototype.say = function(){
						return "my name is "+this.name;
			var o1 = new Clazz("o1");
			var o2 = new Clazz("o2");
			alert(o1.name);
			alert(o2.name);
			alert(o1.say == o2.say); // true.
			// 结论：一种完美的解决方案。
		</script>

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