所有类型的模板都有filters 以控制加载的模板。对于页面，有page_template, 您可以查看的位置the queried page 或查看ID是否存在于an array of a page\'s ancestor IDs.

function wpd_page_template_filter( $template ){
    // the ID of Mango page
    $parent_page = 20;

    if( $parent_page == get_queried_object_id()
        || in_array( $parent_page, get_ancestors( get_queried_object_id(), \'page\' ) ) ){
        $template = locate_template( \'mango.php\', false );
    }
    return $template;
}
add_filter( \'page_template\', \'wpd_page_template_filter\' );