public function getLog(User $user)
 {
     if (!($user->auth & \Config::get('admin.adminLog'))) {
         return response(view('errors.error', ['title' => '权限不足', 'error' => '您没有管理后台日志的权限!']), 403);
     }
     return view('admin.log')->withLog(Log::orderBy('id', 'DESC')->paginate(20))->withUser($user);
 }