/// <summary>
/// 处理处理错误（有action的错误）
/// </summary>
/// <param name="code">错误码</param>
/// <param name="errmsg">错误信息</param>
void handleProcessError(int code, string errmsg, RequestObject.ErrorAction action = null)
{
action = action ?? DefaultErrorHandler;
action.Invoke(code, errmsg);
}
