public static void Init(GameObject root)
 {
     if (LoginLoadingRes.Instance != null)
     {
         throw new Exception("LoginLoadingRes 已经存在");
     }
     LoginLoadingRes.Instance = root.AddComponent <LoginLoadingRes>();
 }
 public static void Uninit()
 {
     if (LoginLoadingRes.Instance == null)
     {
         throw new Exception("LoginLoadingRes 单例不存在");
     }
     Object.Destroy(LoginLoadingRes.Instance);
     LoginLoadingRes.Instance = null;
 }