ActionScript3AS3加载Txt

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package {

import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.events.Event;
import flash.events.IOErrorEvent;

public class GetExternalText {
private var _txtFile:URLLoader;
private var _txtString:String;
public function GetExternalText() {

}

public function loadText(txtFile:String):void {

_txtFile = new URLLoader();
_txtFile.load(new URLRequest(txtFile));
_txtFile.addEventListener(Event.COMPLETE, onLoadTXT, false, 0, true);
_txtFile.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler, false, 0, true);//missing?


}

private function onLoadTXT(evt:Event):void {
_txtString = evt.target.data;
//clean up
_txtFile.removeEventListener(Event.COMPLETE, onLoadTXT);
_txtFile.removeEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
}

private function ioErrorHandler(evt:IOErrorEvent):void {
trace("The following file could not be loaded: " + evt.text);
}

public function get loadedText():String {
_txtString ||= "none loaded"
return _txtString;
}

}

}