分类列表获取子栏目bug修复

app/admin/controller/Category.php

@@ -17,7 +17,7 @@ class Category extends AdminBase
      */
     public function index()
     {
-        $pid = input('param.id', 0, 'intval');
+        $pid = input('param.pid', 0, 'intval');
         $data = [
             "pid" => $pid
         ];