Merge branch 'feature_student' into release/4.9.1.0

# Conflicts:
#	apps/product/models/detail.js
#	config/common.js
#	public/scss/common/_good.css

@@ -99,8 +99,8 @@ const getPlatForm = (req) => {
     yoho.isAndroid = /Android/i.test(userAgent);
     yoho.isApp = /YohoBuy/i.test(req.get('User-Agent')) || (req.query.app_version && req.query.client_type);
     yoho.app_version = req.query.app_version || '';
-    if (req.query.app_version) {
-        arrs = req.query.app_version.split('.');
+    if (yoho.app_version) {
+        arrs = yoho.app_version.split('.');
         if (arrs.length > 2) {
             if (arrs[0] && +arrs[0] < 4) {
                 isNewVersion = false;