EventDispather类的观察者模式

一：对象要成为主题，在自己变化的时候要通知其他对象，使EventDispather类的3种使用方法：
1。以类的静态属性初始化
import mx.event.EventDispather;
class MyClass1{
 public var addEventListener:Function;
 public var removeListener:Function;
 private var dispather:Function;
 
 private var EventDispather_mixin=EventDispather.initialize(MyClass.prototype);
 public MyClass{
  //init
  }
 }
2.在构造函数中初始化
import mx.event.EventDispather;
class MyClass{
 public var addEventListener:Function;
 public var removeListener:Function;
 private var dispather:Function;
 
 public MyClass{
  EventDispather.initialize();
  }
 }
3.以组合的方式包含EventDispather类
import mx.event.EventDispather;
class MyClass{
 private var eventSrc:Object;
 function MyClass3(){
  EventDispather.initialize(eventSrc);
  }
  
 public function registerView(view){
  eventSrc.addEventListener("change",view);
  }
  
 public function removeView(view){
  eventSrc.removeEventListener("change",view);
  }
  
 private function onChange(){
  var eventObj:Object=new Object();
  eventObj.target=this;
  eventObj.type="change";
  eventSrc.dispathEvent(eventObj);
  }
 }
二：观察者接受事件
subject.addEventListener("change",this);
subject.addEventListener("click",this);

public function change(eventObj:Object):Void{
 
 }
public function click(eventObj:Object):Void{
 
 }
public function change(eventObj:Object):Void{
 trace(eventObj.parm1);
 trace(eventObj.parm2);
 }