完善登录校验

@@ -10,11 +10,9 @@ module.exports = (req, res, next) => {
     var loginUrl = 'http://www.yohobuy.com/signin.html',
         referrer = urlFormat(req.originalUrl || '/', null, 'activity');
 
-    if (req.isAPP && !req.app.uid) {
+    if (req.isAPP && !req.query.uid) {
         return res.redirect(loginUrl + '?openby:yohobuy={"action":"go.weblogin","params":{"jumpurl":{"url":"' + referrer + '","param":{"from":"app"}},"requesturl":{"url":"","param":{}},"priority":"N"}}'); // 跳转APP登录页
-    }
-
-    if (!req.cookies._UID) {
+    } else if (!req.isAPP && !req.cookies._UID) {
         loginUrl = loginUrl + '?refer=' + encodeURIComponent(referrer);
         return req.xhr ? res.json({loginUrl: loginUrl}) : res.redirect(loginUrl); // 跳转登录页
     }