我不知道你每门课的条件是什么nav_menu_css_class. 您可以使用它来附加类或从每个列表项中删除类<li> 在菜单中。

/**
 * Modify list item classes of wp_nav_menu
 * - https://codex.wordpress.org/Plugin_API/Filter_Reference/nav_menu_css_class
 * - https://developer.wordpress.org/reference/hooks/nav_menu_css_class/
 *
 * @param Array $classes || List of list-item classes
 * @param WP_Nav_Item Object $item || The Nav Menu Object, NOT the WP_Post object
 *
 * @return Array $classes
 */
function my_special_nav_class( $classes, $item ) {

    $menu_to_test_against = \'MENU NAME HERE\';

    // Ensure we only apply this filter on the menu of our choice
    if( ! has_term( $menu_to_test_against, \'nav_menu\', $item ) ) {
        return $classes;
    }

    $classes[] = \'nav-p\';
    $classes[] = \'nav-n\';

    return $classes;
}
add_filter( \'nav_menu_css_class\', \'my_special_nav_class\', 10, 2 );