void OnGUI()
 {
     GUI.Label(new Rect(10, 5, 200, 50), "分数:", textStyle);
     GUI.Label(new Rect(55, 5, 200, 50), action.GetScore().ToString(), scoreStyle);
     GUI.Label(new Rect(250, 5, 200, 50), timeCounter, timeStyle);
     GUI.Label(new Rect(Screen.width - 330, 5, 50, 50), "已获得金币数:", textStyle);
     GUI.Label(new Rect(Screen.width - 210, 5, 50, 50), action.GetCoinNumHave().ToString(), scoreStyle);
     GUI.Label(new Rect(Screen.width - 170, 5, 50, 50), "还需寻找金币数:", textStyle);
     GUI.Label(new Rect(Screen.width - 40, 5, 50, 50), action.GetCoinNumNeed().ToString(), scoreStyle);
     if (action.isGameOver())
     {
         if (action.GetCoinNumNeed() != 0)
         {
             GUI.Label(new Rect(Screen.width / 2 - 50, Screen.width / 2 - 250, 100, 100), "任务失败!", gameOverStyle);
             if (GUI.Button(new Rect(Screen.width / 2 - 50, Screen.width / 2 - 150, 100, 50), "复活"))
             {
                 action.Restart();
                 return;
             }
         }
         else if (action.GetCoinNumNeed() == 0)
         {
             GUI.Label(new Rect(Screen.width / 2 - 50, Screen.width / 2 - 250, 100, 100), "任务完成!", gameOverStyle);
             if (GUI.Button(new Rect(Screen.width / 2 - 50, Screen.width / 2 - 150, 100, 50), "重新开始"))
             {
                 action.Restart();
                 return;
             }
         }
     }
 }