如果您查看source, 您会发现以下操作与导航菜单的修改相关：

Update:

    /**
     * Fires after a navigation menu has been successfully updated.
     *
     * @since 3.0.0
     *
     * @param int   $menu_id   ID of the updated menu.
     * @param array $menu_data An array of menu data.
     */
    do_action( \'wp_update_nav_menu\', $menu_id, $menu_data );

    /**
     * Fires after a navigation menu is successfully created.
     *
     * @since 3.0.0
     *
     * @param int   $term_id   ID of the new menu.
     * @param array $menu_data An array of menu data.
     */
    do_action( \'wp_create_nav_menu\', $_menu[\'term_id\'], $menu_data );

    /**
     * Fires after a navigation menu has been successfully deleted.
     *
     * @since 3.0.0
     *
     * @param int $term_id ID of the deleted menu.
     */
    do_action( \'wp_delete_nav_menu\', $menu->term_id );