//界面打开
protected override void OnOpen(object param = null)
{
WindowManager.Instance.CloseUI("city");
WindowManager.Instance.CloseUI("joystick");
EventSystem.Instance.addEventListener(RankingEvent.RANKING_UPDATE, OnRankingUpdate);
mRankingModule = ModuleManager.Instance.FindModule <RankingModule>();
mRankingModule.RequestRanking();
SetSelectedRank(param);
UpdateItems();
}
