code: public static function search($data = [])
      {
          $data = array_merge(self::$default_search, $data);
          
          $html = '<div class="am-u-sm-' . $data['sm_num'] . ' am-u-md-' . $data['md_num'] . ' am-u-end">';
          $html .= '<div class="am-form-group">';
          $html .= '<select name="' . $data['name'] . '" class="nd-search-field" data-am-selected="{btnSize: \'sm\'}">';
          if ($data['all']) {
              $html .= '<option value="**">不限</option>';
          }
          foreach ($data['list'] as $vo) {
              if ($data['value'] === $vo['value']) {
                  $html .= '<option selected value="' . $vo['value'] . '">' . $vo['name'] . '</option>';
              } else {
                  $html .= '<option value="' . $vo['value'] . '">' . $vo['name'] . '</option>';
              }
          }
          $html .= '</select>';
          $html .= '</div>';
          $html .= '</div>';
          
          return $html;
      }
docs: search
  
  @param array $data
  @return string