protected function ajaxExecute()
 {
     $tel = MRequest::request('tel');
     $invitecode = MRequest::request('invitecode');
     try {
         $verify = DalUser::getUserVerify($tel);
         if ($verify) {
             return MJsonRespond::respond(ERR_VERIFY_CODE_ALREADY_SEND, '验证码已发出,请不要频繁请求');
         }
         $verify = LibUser::generateUserVerify($tel, $invitecode);
         //TODO:send verify code
     } catch (DBException $e) {
         return MJsonRespond::respondFail('获取验证码失败');
     }
     return MJsonRespond::respondSuccess('获取验证码成功', array('verify' => $verify));
 }