fix bug

app/controller/Ranking.php

@@ -49,14 +49,15 @@ class Ranking
         if (empty($list)) {
             return show("获取成功", SUCCESS_CODE, $result);
         }
+
+        $result = StudentToArray($list);
+
         if ($list->currentPage() < $list->lastPage()) {
             $result['lastIndex'] = $lastIndex + 1;
         } else {
             $result['lastIndex'] = 0;
         }
 
-
-        $result = StudentToArray($list);
         return show(SUCCESS_MESSAGE, SUCCESS_CODE, $result);
     }