         }
     }
 }
+    

    
    /// 移除播放进度通知
    private func removeprogressObser(){
        player.removeTimeObserver(self)
    }
    
    /// 计算缓冲时长

    
    /// 移除所有通知
    private func removeAllObser(){
        removeprogressObser()
        if let item = player.currentItem{
            removeObserToitem(playItem: item)
