编辑

我删除了原来的问题，因为这个Q现在有1000多个视图，这意味着向您展示一些可以工作的东西对很多人来说都很重要a）无需定制助行器&；b） 这很简单注意：我只删除了原始Q，因为它非常不引人注目。

该任务将css类添加到通过（管理UI）外观>菜单添加的特定导航菜单中的所有导航菜单项。

功能

function wpse4388_navmenu_classes( $items, $menu, $args )
{
    // prevent crashing the appearance > menu admin UI
    if ( is_admin() )
        return;

    # >>>> start editing

        // Nav menu name you entered in the admin-UI > Appearance > Menus (Add menu).
        $target[\'name\'] = \'Topnav\';

        // A targeted menu item that needs a special class - add the item number here
        $target[\'items\'] = array( (int) 6 );

    # <<<< stop editing

    // filter for child themes: "filter_nav_menu_{nav menu name}"
    // the nav menu name looses all empty spaces and is set to lower
    // if you want to use the filter, hook your child theme function into \'after_setup_theme\'
    $target = apply_filters( \'filter_nav_menu_\'.strtolower( str_replace( " ", "", $target[\'name\'] ), $target );

    // Abort if we\'re not with the named menu
    if ( $menu->name !== $target[\'name\'] ) 
        return;

    foreach ( $items as $item )
    {
        // Add the class for each menu item
        $item->classes = \'classes for all items\';

        // Append this class if we are in one of the targeted items
        if ( in_array( (int) $item->menu_order, $target[\'items\'] ) )
            $item->classes .= \' only for a single item\';
    }

    return $items;
}
add_filter( \'wp_get_nav_menu_items\', \'wpse4388_navmenu_classes\', 10, 3 );

这有帮助吗？别忘了投赞成票！：）

function my_wp_nav_menu_args( $args = \'\' ) {
    if( $args[\'theme_location\'] == \'your-specific-location\' )
        $args = array_merge( array(
            \'container_class\' => \'example\',
            \'menu_class\' => \'example2\'
        ), $args );
    return $args;
}
add_filter( \'wp_nav_menu_args\', \'my_wp_nav_menu_args\' );

<?php wp_nav_menu( array( \'theme_location\' => \'Top Nav\', \'menu_class\' => \'span-3\' ) ); ?>

function theme_add_menuclass( $classes, $args ) {
    if ( $args->theme_location == \'your-menu-location\' ) {
        return preg_replace( \'/<li /i\', \'<li class="your-class"\', $classes );
    }
    return $classes;
}
add_filter( \'wp_nav_menu_items\', \'theme_add_menuclass\', 10, 2 );

my-class-one my-class-two