在functions.php函数文件中添加下面代码

//页面伪静态

    add_action('init', 'html_page_permalink', -1);
    register_activation_hook(__FILE__, 'active');
    register_deactivation_hook(__FILE__, 'deactive');
    function html_page_permalink() {
        global $wp_rewrite;
        if (!strpos($wp_rewrite->get_page_permastruct() , '.html')) {
            $wp_rewrite->page_structure = $wp_rewrite->page_structure . '.html';
        }
    }
    add_filter('user_trailingslashit', 'no_page_slash', 66, 2);
    function no_page_slash($string, $type) {
        global $wp_rewrite;
        if ($wp_rewrite->using_permalinks() && $wp_rewrite->use_trailing_slashes == true && $type == 'page') {
            return untrailingslashit($string);
        } else {
            return $string;
        }
    }
    function active() {
        global $wp_rewrite;
        if (!strpos($wp_rewrite->get_page_permastruct() , '.html')) {
            $wp_rewrite->page_structure = $wp_rewrite->page_structure . '.html';
        }
        $wp_rewrite->flush_rules();
    }
    function deactive() {
        global $wp_rewrite;
        $wp_rewrite->page_structure = str_replace(".html", "", $wp_rewrite->page_structure);
        $wp_rewrite->flush_rules();
    }