修改路由错误

backend/config/urlmanager.php

@@ -76,7 +76,7 @@ return [
                         'GET,OPTIONS membergrade-detail' => 'membergrade-detail',
                         'PUT,OPTIONS membergrade-revise' => 'membergrade-revise',
                         'POST,OPTIONS membergrade-add' => 'membergrade-add',
-                        'DELETE,OPTIONS del' => 'membergrade-delete',
+                        'DELETE,OPTIONS membergrade-delete' => 'membergrade-delete',
                     ],
                 ],
                 //部门信息