关于提取另外一个swf里的某个mc问题

public function role(){

loader=new Loader();

bodyrequest=new URLRequest(bodyFILE_PATH);

loader.contentLoaderInfo.addEventListener(Event.COMPLETE,onComplete);

loader.load(bodyrequest);

}

private function onComplete(event:Event):void{

var loaderSWF=event.target;

var domain:ApplicationDomain=loaderSWF.applicationDomain as ApplicationDomain;

//从加载的swf域中提取类定义

var bodyClass:Class=domain.getDefinition("walk") as Class;

var body:MovieClip=(new bodyClass()) as MovieClip;

body.x=500,body.y=400;

addChild(body);

}