04头部栏目底部栏目调用–新手小白，快速使用静态页面建立wordpress主题

function register_my_menu()
{
	register_nav_menus(array(
		'header-menu' => __('Header Menu'),//顶部菜单

		'footer-menu' => __('Footer Menu'),//底部菜单
		'thesame-menu' => __('thesame Menu'),//通用菜单
		
		'other-menu' => __('other Menu')//通用菜单
	));
}
add_action('init', 'register_my_menu');
//可以使用，也可以不使用，具体看自己需求，这个属于代码注册，也可以直接后台设置导航菜单

wp_nav_menu(array(
    'theme_location' => 'header_menu',
    'menu'  => 'header_menu',
    'container'      => 'nav',
    'container_class'=> 'main-navigation',
    'menu_class'     => 'menu-list',
    'depth'          => 3,
    'fallback_cb'    => 'wp_page_menu'
));

wp_nav_menu(array(
    'theme_location'  => 'mobile_menu',
    'container'       => false,
    'menu_class'      => 'mobile-nav',
    'walker'          => new Mobile_Menu_Walker()
));

              <?php
                  // 显示头部菜单
                  wp_nav_menu(array(
                    'theme_location' => 'header-meru-jcfw-1',
                    'menu'  => 'header-meru-jcfw-1',
                    'walker' => new My_Custom_top_menu(),
                    'container' => '',
                    'container_class' => '',
                    'menu_class' => ''
                  ));
                  ?>

class My_Custom_top_menu extends Walker_Nav_Menu
{
	function start_el(&$output, $item, $depth = 0, $args = array(), $id = 0)
	{
		$output .= '<li >';
		$output .= '<a href="' . $item->url . '" data-hover="' . $item->title . '"   >';
		$output .= '' . $item->title;
		$output .= '</a></li>';
	}
}

<?php
   // 显示头部菜单
                  wp_nav_menu(array(
                    'theme_location' => '',
                    'menu'  => 'header-meru-jcfw',
                    'walker' => new Mega_Menu_Walker(),
                    'container' =>false,
                    'container_class' => '',
                    'items_wrap' => '<div class="nav-menu">%3$s</div>'
                  ));
                  ?>

                  
// 多级导航菜单Walker类
class Mega_Menu_Walker extends Walker_Nav_Menu
{
	function start_lvl(&$output, $depth = 0, $args = array()) {
		if ($depth == 0) {
			$output .= '<div class="mega-menu"><div class="mega-menu-content"><div class="mega-menu-inner">';
		} else if ($depth == 1) {
			$output .= '<ul>';
		}
	}

	function end_lvl(&$output, $depth = 0, $args = array()) {
		if ($depth == 0) {
			$output .= '</div></div></div>';
		} else if ($depth == 1) {
			$output .= '</ul>';
		}
	}

	function start_el(&$output, $item, $depth = 0, $args = array(), $id = 0) {
		if ($depth == 0) {
			// 一级菜单
			$output .= '<li class="nav-item has-dropdown">';
			$output .= '<a href="' . $item->url . '">' . $item->title . ' <i class="fas fa-caret-down"></i></a>';
		} else if ($depth == 1) {
			// 二级菜单（标题）
			$output .= '<div class="mega-menu-column">';
			$output .= '<h3>' . $item->title . '</h3>';
		} else if ($depth == 2) {
			// 三级菜单（具体链接）
			$output .= '<li><a href="' . $item->url . '">' . $item->title . '</a></li>';
		}
	}

	function end_el(&$output, $item, $depth = 0, $args = array()) {
		if ($depth == 0) {
			// 一级菜单结束
			$output .= '</li>';
		} else if ($depth == 1) {
			// 二级菜单结束
			$output .= '</div>';
		}
		// 三级菜单不需要额外结束标签
	}
}