paginate with params

@@ -35,7 +35,8 @@ const index = (req, res) => {
             paginationOpts: {
                 page: pageNum,        // current page: http://host/?page=2
                 limit: 10,            // per_page records' number
-                total: 100            // total page number
+                total: 100,            // total page number
+                queryParams: req.query
             },
             goods: {
                 img: 'http://placehold.it/274x366',

@@ -78,11 +78,12 @@ exports.createPagination = function(pagination, options) {
                 queryParams += key + '=' + pagination.queryParams[key] + '&';
             }
         }
-        lastCharacterOfQueryParams = queryParams.substring(queryParams.length, -1);
+        //lastCharacterOfQueryParams = queryParams.substring(queryParams.length, -1);
+        lastCharacterOfQueryParams = queryParams.slice(queryParams.length - 1);
 
         if (lastCharacterOfQueryParams === '&') {
             // trim off last & character
-            queryParams = queryParams.substring(0, queryParams.length - 1);
+            queryParams = queryParams.slice(0, queryParams.length - 1);
         }
     }