/// <summary>
 /// 恢复播放背景音乐
 /// </summary>
 /// <param name="isGradual">是否渐进式</param>
 public void UnPauseBackgroundMusic(bool isGradual = true)
 {
     if (isGradual)
     {
         BackgroundAudio.volume = 0;
         BackgroundAudio.UnPause();
         BackgroundAudio.DOFade(BackgroundVolume, 2);
     }
     else
     {
         BackgroundAudio.UnPause();
     }
 }