?xml version="1.0" encoding="utf-8"?>
s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" width="100%" height="100%">

fx:Script>
![CDATA[

import flash.external.ExternalInterface;
import flash.system.Security;
import mx.controls.Alert;
import mx.events.FlexEvent;
public var callBackInfo:String = "";

public function doSend():void{

var call:FlexApp = new FlexApp("Hello",callBack);

}

public function callBack(info):void{

Alert.show(info);

}

]]>
/fx:Script>

fx:Declarations>
!-- 将非可视元素（例如服务、值对象）放在此处 -->
/fx:Declarations>
s:Panel width="100%" height="100%">

s:Button label="Send" click="doSend()">

/s:Button>


/s:Panel>

/s:Application>

package
{
public class FlexApp
{

public function FlexApp(param:String,func:Function)
{

func.call(null,"收到");
}
}
}