优化登录后跳转

application/admin/controller/Index.php

@@ -70,7 +70,7 @@ class Index extends Backend
     public function login()
     {
         $url = $this->request->get('url', '', 'url_clean');
-        $url = $url ?: 'index/index';
+        $url = $url && !preg_match('/\/index\/(login|logout)$/', $url) ? $url : 'index/index';
         if ($this->auth->isLogin()) {
             $this->success(__("You've logged in, do not login again"), $url);
         }