!84 修复拖拽排序函数的一处BUG

Merge pull request !84 from Teemo/master

application/admin/controller/Ajax.php

@@ -146,7 +146,7 @@ class Ajax extends Backend
         //操作的数据表
         $table = $this->request->post("table");
         //排序的方式
-        $orderway = $this->request->post("orderway", 'strtolower');
+        $orderway = $this->request->post("orderway", "", 'strtolower');
         $orderway = $orderway == 'asc' ? 'ASC' : 'DESC';
         $sour = $weighdata = [];
         $ids = explode(',', $ids);