flex actionscript 与javascirpt相互调用

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<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" minWidth="955" minHeight="600"><mx:Script><![CDATA[import flash.external.*;import mx.controls.Alert;public function asFunction():String{Alert.show("beCall");return "我是flex,我被调用";}public function beClick():void {ExternalInterface.addCallback("JavaScript中被调用的function",asFunction);ExternalInterface.call("eval",  "var jsvar="+Application.application.id+".JavaScript中被调用的function(); alert(jsvar); ");}]]></mx:Script><mx:Button id="aa" x="240" y="216" label="sssss" click="beClick()"/></mx:Application>