public function getList($field = "*", $wheres = array())
 {
     $rows = parent::getList($field, $wheres);
     foreach ($rows as &$row) {
         //对可选值 通过 回车换行进行分割
         if (!empty($row['option_values'])) {
             $row['option_values'] = preg_split("/\n/", $row['option_values']);
         }
     }
     return $rows;
 }