这是您需要执行的操作的一般要点，您需要在此处添加一些检查，确保返回的菜单有效，等等。。

$locations = get_theme_mod( \'nav_menu_locations\' );
$menu = wp_get_nav_menu_object( reset( $locations ) ); // get first item in menu locations array
$menu_item_data = array(
    \'menu-item-object-id\' => $your_page->ID, // ID of the page you want to add
    \'menu-item-parent-id\' => 0,              // top level menu item
    \'menu-item-position\' => 0,               // setting position to 0 will add it to the end
    \'menu-item-object\' => \'page\',
    \'menu-item-type\' => \'post_type\',
    \'menu-item-status\' => \'publish\'
);
wp_update_nav_menu_item( $menu->term_id, 0, $menu_item_data );