如果希望WordPress动态添加这些项，则需要向菜单声明中添加自定义walker类。
查找菜单在主题中的声明位置，并在主题中添加自定义walker类名wp_nav_menu 功能：
wp_nav_menu( array ( \'menu\'=> \'main-menu\', \'container\'=> \'\', \'walker\' => new Description_Walker));
菜单可能有一组值，但只需添加一行：
\'walker\' => new Description_Walker
然后，您需要创建自定义walker类来扩展menu类。这是一个巨大的例子：
wp_nav_menu( array(
\'menu\' => \'Something custom walker\',
\'walker\' => new WPDocs_Walker_Nav_Menu()
) );
/**
* Custom walker class.
*/
class WPDocs_Walker_Nav_Menu extends Walker_Nav_Menu {
/**
* Starts the list before the elements are added.
*
* Adds classes to the unordered list sub-menus.
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of arguments. @see wp_nav_menu()
*/
function start_lvl( &$output, $depth = 0, $args = array() ) {
// Depth-dependent classes.
$indent = ( $depth > 0 ? str_repeat( "\\t", $depth ) : \'\' ); // code indent
$display_depth = ( $depth + 1); // because it counts the first submenu as 0
$classes = array(
\'sub-menu\',
( $display_depth % 2 ? \'menu-odd\' : \'menu-even\' ),
( $display_depth >=2 ? \'sub-sub-menu\' : \'\' ),
\'menu-depth-\' . $display_depth
);
$class_names = implode( \' \', $classes );
// Build HTML for output.
$output .= "\\n" . $indent . \'<ul class="\' . $class_names . \'">\' . "\\n";
}
/**
* Start the element output.
*
* Adds main/sub-classes to the list items and links.
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of arguments. @see wp_nav_menu()
* @param int $id Current item ID.
*/
function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
global $wp_query;
$indent = ( $depth > 0 ? str_repeat( "\\t", $depth ) : \'\' ); // code indent
// Depth-dependent classes.
$depth_classes = array(
( $depth == 0 ? \'main-menu-item\' : \'sub-menu-item\' ),
( $depth >=2 ? \'sub-sub-menu-item\' : \'\' ),
( $depth % 2 ? \'menu-item-odd\' : \'menu-item-even\' ),
\'menu-item-depth-\' . $depth
);
$depth_class_names = esc_attr( implode( \' \', $depth_classes ) );
// Passed classes.
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$class_names = esc_attr( implode( \' \', apply_filters( \'nav_menu_css_class\', array_filter( $classes ), $item ) ) );
// Build HTML.
$output .= $indent . \'<li id="nav-menu-item-\'. $item->ID . \'" class="\' . $depth_class_names . \' \' . $class_names . \'">\';
// Link attributes.
$attributes = ! empty( $item->attr_title ) ? \' title="\' . esc_attr( $item->attr_title ) .\'"\' : \'\';
$attributes .= ! empty( $item->target ) ? \' target="\' . esc_attr( $item->target ) .\'"\' : \'\';
$attributes .= ! empty( $item->xfn ) ? \' rel="\' . esc_attr( $item->xfn ) .\'"\' : \'\';
$attributes .= ! empty( $item->url ) ? \' href="\' . esc_attr( $item->url ) .\'"\' : \'\';
$attributes .= \' class="menu-link \' . ( $depth > 0 ? \'sub-menu-link\' : \'main-menu-link\' ) . \'"\';
// Build HTML output and pass through the proper filter.
$item_output = sprintf( \'%1$s<a%2$s>%3$s%4$s%5$s</a>%6$s\',
$args->before,
$attributes,
$args->link_before,
apply_filters( \'the_title\', $item->title, $item->ID ),
$args->link_after,
$args->after
);
$output .= apply_filters( \'walker_nav_menu_start_el\', $item_output, $item, $depth, $args );
}
}
您可以看到这样的部分：
// Build HTML.
$output .= $indent . \'<li id="nav-menu-item-\'. $item->ID . \'" class="\' . $depth_class_names . \' \' . $class_names . \'">\';
只需添加
data-hover="\' .$item->title. \'" 或者类似的东西，它会自动添加你想要的东西。
我的代码来自：
此外，这里还有一个关于在需要时制作walker课程的教程：
