add limit-review by wenxue

@@ -25,10 +25,11 @@ exports.productLst = function(req, res, next) {
             filter_poolId: req.query.filter_poolId || ''
         }, req.query));
     } else if (req.query.is_ufo === 'Y') {
-        let keys = ['product_id', 'productPool', 'sort', 'brand', 'series', 'size', 'limit'];
+        let keys = ['product_id', 'productPool', 'sort', 'brand', 'series', 'size'];
         let params = {
             uid: uid,
-            udid: udid
+            udid: udid,
+            limit: req.query.limit || 20,
         };
 
         keys.forEach(function(k) {