我正在研究WordPress主题。在主导航菜单中，我必须使用以下代码在菜单项上应用Bootstrap4样式（从here).

register_nav_menus( array(
    \'menu-1\' => esc_html__( \'Primary\', \'theme-textdomain\' ),
) );

// Now, you can display the menu in your theme via below PHP code addition in the header.php file of your theme.

<nav class="navbar navbar-expand-lg navbar-light bg-light">
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbar-content" aria-controls="navbar-content" aria-expanded="false" aria-label="<?php esc_html_e( \'Toggle Navigation\', \'theme-textdomain\' ); ?>">
            <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse" id="navbar-content">
            <?php
            wp_nav_menu( array(
                \'theme_location\' => \'menu-1\',
                \'menu_id\'        => \'primary-menu\',
                \'container\'      => false,
                \'depth\'          => 2,
                \'menu_class\'     => \'navbar-nav ml-auto\',
                \'walker\'         => new Bootstrap_NavWalker(),
                \'fallback_cb\'    => \'Bootstrap_NavWalker::fallback\',
            ) );
            ?>
        </div>
</nav>

如果我不使用导航行走器，编辑快捷方式将可见，并适用于导航菜单。

但是，当我使用导航助行器时，按钮会消失。

我尝试在customiser中添加此代码

 $wp_customize->selective_refresh->add_partial(\'primarymenu\', array(
        \'selector\' => \'#site-navigation\',
        \'render_callback\' => \'asensio_customize_partial_primarymenu\',
    ));

这没有效果。

wp_nav_menu( array(
    // ...
    \'walker\' => new My_Custom_Walker(),
) );

wp_nav_menu( array(
    // ...
    \'walker\' => \'My_Custom_Walker\',
) );