我会尽量简短。因此，基本上我正在尝试将自定义项添加到我的菜单中，在本例中，这是带有months desc的归档下拉列表.wp_get_archives 也会忽略所有css

function add_archive_dropdown($items, $args) {
      if( $args->theme_location == \'primary\' ){
      $items .=\'<li class="nav-item dropdown">\'
                .\'<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">\'
                  .\'Archive\'
                .\'</a>\'
                .\'<ul class="dropdown-menu" style="list-style:none;" aria-labelledby="navbarDropdown">\'
                .\'<li>\'
                .\'<a href="#">\'.\'August 2018\' .\'</a>\'
                .\'</li>\'
                .\'<li>\'
                .wp_get_archives( array(\'type\' => \'monthly\', \'format\' => \'html\', \'show_post_count\' => $c))
                .\'</li>\'
                .\'</ul>\'
                .\'</li>\';
      }


      return $items;
}

add_filter(\'wp_nav_menu_items\', \'add_archive_dropdown\', 10, 2);