将以下代码用于functions.php 文件

function change_title_yt( $post_id ) {
    $current_title = $_POST[\'post_title\'];

    $doc = new DOMDocument();
    $doc->preserveWhiteSpace = FALSE;
    $doc->loadHTMLFile($current_title);

    $title_div = $doc->getElementById(\'eow-title\');
    $title = $title_div->nodeValue;

    $my_args = array(
        \'ID\' => $post_id,
        \'post_title\' => $title
    );

    if ( ! wp_is_post_revision( $post_id ) ){

        // unhook this function so it doesn\'t loop infinitely
        remove_action(\'save_post\', \'change_title_yt\');

        // update the post, which calls save_post again
        wp_update_post( $my_args );

        // re-hook this function
        add_action(\'save_post\', \'change_title_yt\');
    }
}
add_action(\'save_post\', \'change_title_yt\');