public function get_ref($params = [])
 {
     //echo '<pre>'; print_r($params); echo '</pre>'; exit;
     if (isset($params['_escaped_fragment_'])) {
         $file_name = substr($params['_escaped_fragment_'], 5);
         $context = ['page' => $file_name, 'link_style' => -1];
         $content = Template::render_doc_by_name('basic-ref', $context);
         Render::html($content);
     } else {
         Render::include_script("app/mdCode");
         parent::doc($params);
     }
 }