import flash.events.Event; import flash.net.URLLoader; import flash.net.URLRequest; import flash.net.URLVariables;  public class TxtLoader { private var setTxt:Function = null; public function TxtLoader() { }  public function loadTxt(fileName:String, setTxt:Function):void {  this.setTxt = setTxt;  var urlRequest:URLRequest = new URLRequest(fileName);  var urlLoader:URLLoader = new URLLoader();  urlLoader.addEventListener(Event.COMPLETE, complete);  urlLoader.load(urlRequest); }  private function complete(event:Event):void {  var urlLoader:URLLoader = event.currentTarget as URLLoader;  setTxt.call(null, urlLoader.data); } }-----------------調用的方法-------------------------------------------------------------   new TxtLoader().loadTxt('readme.txt', function(txt:String):void {          Alert.show( txt);     });