trim skn

@@ -87,29 +87,22 @@ const getRecommendShop = (req, res, next) => {
  * @param next
  */
 const recentPreview = (req, res, next) => {
-    let browserSkn = req.cookies._browseskn;
-    let limit = req.query.limit;
+    let browserSkn = req.cookies._browseskn || '';
+    let limit = req.query.limit || 20;
+    let skn = _.trim(browserSkn ? decodeURIComponent(browserSkn).replace(/\-(\d)+(\,){0,1}/g, ',') : '', ',');
 
-    // 拆解skn
-    let skn = browserSkn ? decodeURIComponent(browserSkn).replace(/\-(\d)+(\,){0,1}/g, ',') : '';
-
-    // 去除skn字符串的最后一个多余的,
-    if (skn && skn.lastIndexOf(',') === skn.length - 1) {
-        skn = skn.slice(0, -1);
-    }
+    if (skn) {
+        skn = _.slice(_.uniq(skn.split(',')), 0, limit).join(','); // 去重+截取
 
-    if (!skn) {
+        recommend.recentPreview(skn, limit).then(data => {
+            res.jsonp(data);
+        }).catch(next);
+    } else {
         res.jsonp({
             code: 200,
             data: [],
             message: 'User info'
         });
-    } else {
-        skn = _.slice(_.uniq(skn.split(',')), 0, limit).join(','); // 去重+截取
-
-        recommend.recentPreview(skn, limit).then(data => {
-            res.jsonp(data);
-        }).catch(next);
     }
 };