public void Handle(int level)
 {
     if (level == mLv)
     {
         UpdateStage();
         CheckIsFinished();//检查关卡是否结束
     }
     else
     {
         mNextHandler.Handle(level);
     }
 }
 public override void Update()
 {
     base.Update();
     mRootHandler.Handle(mLv);
 }