as3回调方法模拟事件监听

//=================Client.as ==============
package callback{import flash.display.Sprite;public class Client extends Sprite{public function Client() {//调用Seriver类的callFun方法,并把clientFun方法传给callFun方法var server : Server = new Server();server.callFun(clientFun);}//定义一个回调方法让Server中的callFun来调用public function clientFun() : void{trace("I am a callback function defiend by Client");}}
}//===================Server.as==============
package callback{import flash.display.Sprite;import flash.utils.setTimeout;public class Server extends Sprite{public function Server() {super();}//接收Client类传入的方法public function callFun(arg : Function) : void{trace("I am a server method.....");//先做一些事情setTimeout(showMsg, 1000);//调用Client类传过来的方法setTimeout(arg, 3000);}private function showMsg() : void{trace("do some stuff on server..........");}}
}