/**
  * 获取公共信息
  */
 protected function _getPublicInfo()
 {
     //获取栏目信息:
     $dbCategory = new Db_Category();
     if ($result = $dbCategory->fetchAll('1', 'id')) {
         $categorys = $result->toArray();
         $this->smarty->assign('categorys', $categorys);
     }
 }