fix bug

@@ -218,7 +218,7 @@ const sendCodeToMobileAPI = (req, res, next) => {
         }
         req.session.backupCaptch.useTime = req.session.backupCaptch.useTime - 1;
     } else {
-        req.session.backupCaptch.useTime = 5;
+        _.set(req.session, 'backupCaptch.useTime', 5);
     }
 
     if (verifyCode) {

@@ -186,7 +186,6 @@ let codeAction = (req, res, next) => {
     res.render('reg/code', {
         page: 'code',
         title: '注册-验证码',
-        backUrl: '/?go=1', // eslint-disable-line
         headerText: '注册', // 头部信息
         isPassportPage: true, // 模板中模块标识
         areaCode: area, // 默认的区号