wp_nav_menu输出只带a的item

$footer_menu = wp_nav_menu(
					array(
						'theme_location' => 'footer',
						'container' => false,
						'items_wrap' => '%3$s',
						'echo' => false,
						'after' => '| ',
					)
				);
				$footer_menu = strip_tags($footer_menu, '<a>');
				echo $footer_menu;