<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<script type="text/javascript">
var ObserverObj = { /*依赖对象*/
FirstName: "J",
LastName: "Q",
Id: 1
}
var ObserverManager = { /*观察器*/
Observers:[], /*观察对象集*/
AddObserver: function(item){/*加入观察对象*/
this.Observers.push(item);
},
Change: function(obj){ /*改变对象行为*/
for(var item in obj){
ObserverObj[item] = obj[item];
}//改变数据依赖对象数据
for(var i = 0,len = this.Observers.length; i < len; i++){
var item = this.Observers[i];
item.Display(); //对象改变后，改变观察对象的行为Display; 为统一的接口
}
}
}
var Header = function(){ /*观察对象Header*/
this.Display = function(){
alert(ObserverObj.FirstName);
}
}
var Content = function(){ /*观察对象Content*/
this.Display = function(){
alert(ObserverObj.LastName);
}
}
var Foot = function(){ /*观察对象Foot*/
this.Display = function(){
alert(ObserverObj.Id);
}
}
/*绑定观察器动作*/
ObserverManager.AddObserver(new Header());
ObserverManager.AddObserver(new Content());
ObserverManager.AddObserver(new Foot());
</script>
<!--使用方法-->
<a href="javascript://" onclick="ObserverManager.Change({FirstName:‘江‘});">改变FirstName</a>
<a href="javascript://" onclick="ObserverManager.Change({LastName:‘琪‘});">改变LastName</a>
<a href="javascript://" onclick="ObserverManager.Change({Id:2});">改变Id</a>
</body>
</html>
观察者实例
时间： 2024-11-09 01:54:54