public QueueItem(SimpleLoader loader)
 {
     this.loader = loader;
     //1 simpleloader 添加监听
     loader.addEventListener(LoadResourceEvent.Complete, LoadComplete);
     loader.addEventListener(LoadResourceEvent.Progress, LoadProgress);
 }
 public QueueItem(SimpleLoader loader)
 {
     this.loader = loader;
     loader.addEventListener(LoadEvent.Complete, LoadComplete);
     loader.addEventListener(LoadEvent.Progress, LoadProgress);
 }