public string SignInJson(string inputJsonStr)
 {
     job = gm.getJsonResult(inputJsonStr);
     try
     {
         string account  = job["Account"].ToString();
         string password = job["Password"].ToString();
         if (!account.Equals("") && !password.Equals(""))
         {
             return(main.SignIn(account, password));
         }
         else
         {
             return(gm.getStageJson(false, msg.signNullError_cht));
         }
     }
     catch (Exception ex)
     {
         Console.WriteLine(ex.Message);
         return(gm.getStageJson(false, msg.signError_cht));
     }
 }