/// <summary>
/// 恢复当前场景下载
/// </summary>
public void ResumeCurSceneDownload()
{
BackDownload.ResumeLevel(DataLevel.CurScene);
}
/// <summary>
/// 恢复后台下载，与pause成对
/// </summary>
public void ResumeBaseDownload()
{
BackDownload.ResumeLevel(DataLevel.Low);
}