Javascript 模式实例 观察者模式_javascript技巧

var ObserverObj = { /**//*依赖对象*/
FirstName: "Max",
LastName: "Gan",
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 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());

改变FirstName
改变LastName
改变Id