零时弄个loadedBar类，分享

由于主管急着使用，以解燃眉之急，暂时为留出更多接口，待稍后修改再奉上。

package  {
    import flash.display.Sprite;
    import flash.net.URLLoader;
    import flash.net.URLRequest;
    import flash.events.Event;
    import flash.events.ProgressEvent;
    
    public class URLLoaderBar extends Sprite {
        private var urlLoader:URLLoader;
        private var loaded:Sprite;//loaded UI
        private var total:Sprite;//total UI
        public function URLLoaderBar(urlRequest:URLRequest) {
            //draw total bar;
            total.graphics.beginFill(0x000000,1);
            total.graphics.drawRect(0,0,200,10);
            total.graphics.endFill();
            total.x = total.y = 0;
            this.addChild(total);
            
            //draw loaded bar;
            loaded.graphics.beginFill(0x00ff00,1);
            loaded.graphics.drawRect(0,0,0,10);
            loaded.graphics.endFill();
            loaded.x = total.y = 0;
            this.addChild(loaded);
            
            //start to listen
            urlLoader = new URLLoader(urlRequest);
            urlLoader.addEventListener(Event.OPEN, onOpenHandler);
            urlLoader.addEventListener(ProgressEvent.PROGRESS, onProgressHandler);
            urlLoader.addEventListener(Event.COMPLETE, onCompleteHandler);
        }
        
        private function onOpenHandler(event:Event):void{
            trace('opened'+ urlLoader.bytesLoaded+'%')
            }
        private function onProgressHandler(event:ProgressEvent):void{
            var amount:Number = (urlLoader.bytesLoaded/urlLoader.bytesTotal)*200;
            loaded.graphics.clear();
            loaded.graphics.beginFill(0x00ff00,1);
            loaded.graphics.drawRect(0,0,amount,10);
            loaded.graphics.endFill();
            }
        private function onCompleteHandler(event:Event):void{
            trace('load complete'+ urlLoader.bytesLoaded+'%')
            }
    }
}