AS3，如何在点按钮后，跳转至某帧，同时载入外部的SWF~~解决问题后追加50分！

import flash.display.Loader;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.net.URLRequest;
import flash.display.Sprite;

var loader:Loader;

btn.addEventListener(MouseEvent.CLICK,onClick);

function onClick(evt:MouseEvent):void
{
loader = new Loader;
loader.contentLoaderInfo.addEventListener(Event.COMPLETE,onCom);
addChild(loader);
loader.load(new URLRequest("a.swf"));
}
function onCom(evt:Event):void
{
gotoAndStop(2);
if(loader.content["back"] !=null)
{
(loader.content["back"] as Sprite).addEventListener(MouseEvent.CLICK,onClickBack);
}
}
function onClickBack(evt:MouseEvent):void
{
loader.unloadAndStop();
}

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