mobile refer

@@ -6,8 +6,9 @@ const querystring = require('querystring');
 
 module.exports = () => {
     return (req, res, next) => {
-        if (req.isMobile) {
-            return res.redirect(req.mobileUrl || `//m.yohobuy.com${req.url}?${querystring.stringify(req.query)}`);
+        if (!req.xhr && req.isMobile) {
+            return res.redirect(req.mobileUrl || res.locals.mobileRefer ||
+                `//m.yohobuy.com${req.url}?${querystring.stringify(req.query)}`);
         }
 
         return next();