用到的函数：
wp_body_open
结构：
header
<?php
/**
* Header file for the Twenty Twenty WordPress default theme.
*
* @link https://developer.wordpress.org/themes/basics/template-files/#template-partials
*
* @package WordPress
* @subpackage Twenty_Twenty
* @since 1.0.0
*/
?><!DOCTYPE html>
<html class="no-js" <?php language_attributes(); ?>>
<head>
<meta charset="<?php bloginfo( 'charset' ); ?>">
<meta name="viewport" content="width=device-width, initial-scale=1.0" >
<link rel="profile" href="https://gmpg.org/xfn/11">
<?php wp_head(); ?>
</head>
<body <?php body_class(); ?>>
<?php
wp_body_open();
?>
<header id="site-header" class="header-footer-group" role="banner">
<div class="header-inner section-inner">
<div class="header-titles-wrapper">
<?php
// Check whether the header search is activated in the customizer.
$enable_header_search = get_theme_mod( 'enable_header_search', true );
if ( true === $enable_header_search ) {
?>
<button class="toggle search-toggle mobile-search-toggle" data-toggle-target=".search-modal" data-toggle-body-class="showing-search-modal" data-set-focus=".search-modal .search-field" aria-expanded="false">
<span class="toggle-inner">
<span class="toggle-icon">
<?php twentytwenty_the_theme_svg( 'search' ); ?>
</span>
<span class="toggle-text"><?php _e( 'Search', 'twentytwenty' ); ?></span>
</span>
</button><!-- .search-toggle -->
<?php } ?>
<div class="header-titles">
<?php
// Site title or logo.
twentytwenty_site_logo();
// Site description.
twentytwenty_site_description();
?>
</div><!-- .header-titles -->
<button class="toggle nav-toggle mobile-nav-toggle" data-toggle-target=".menu-modal" data-toggle-body-class="showing-menu-modal" aria-expanded="false" data-set-focus=".close-nav-toggle">
<span class="toggle-inner">
<span class="toggle-icon">
<?php twentytwenty_the_theme_svg( 'ellipsis' ); ?>
</span>
<span class="toggle-text"><?php _e( 'Menu', 'twentytwenty' ); ?></span>
</span>
</button><!-- .nav-toggle -->
</div><!-- .header-titles-wrapper -->
<div class="header-navigation-wrapper">
<?php
if ( has_nav_menu( 'primary' ) || ! has_nav_menu( 'expanded' ) ) {
?>
<nav class="primary-menu-wrapper" aria-label="<?php esc_attr_e( 'Horizontal', 'twentytwenty' ); ?>" role="navigation">
<ul class="primary-menu reset-list-style">
<?php
if ( has_nav_menu( 'primary' ) ) {
wp_nav_menu(
array(
'container' => '',
'items_wrap' => '%3$s',
'theme_location' => 'primary',
)
);
} elseif ( ! has_nav_menu( 'expanded' ) ) {
wp_list_pages(
array(
'match_menu_classes' => true,
'show_sub_menu_icons' => true,
'title_li' => false,
'walker' => new TwentyTwenty_Walker_Page(),
)
);
}
?>
</ul>
</nav><!-- .primary-menu-wrapper -->
<?php
}
if ( true === $enable_header_search || has_nav_menu( 'expanded' ) ) {
?>
<div class="header-toggles hide-no-js">
<?php
if ( has_nav_menu( 'expanded' ) ) {
?>
<div class="toggle-wrapper nav-toggle-wrapper has-expanded-menu">
<button class="toggle nav-toggle desktop-nav-toggle" data-toggle-target=".menu-modal" data-toggle-body-class="showing-menu-modal" aria-expanded="false" data-set-focus=".close-nav-toggle">
<span class="toggle-inner">
<span class="toggle-text"><?php _e( 'Menu', 'twentytwenty' ); ?></span>
<span class="toggle-icon">
<?php twentytwenty_the_theme_svg( 'ellipsis' ); ?>
</span>
</span>
</button><!-- .nav-toggle -->
</div><!-- .nav-toggle-wrapper -->
<?php
}
if ( true === $enable_header_search ) {
?>
<div class="toggle-wrapper search-toggle-wrapper">
<button class="toggle search-toggle desktop-search-toggle" data-toggle-target=".search-modal" data-toggle-body-class="showing-search-modal" data-set-focus=".search-modal .search-field" aria-expanded="false">
<span class="toggle-inner">
<?php twentytwenty_the_theme_svg( 'search' ); ?>
<span class="toggle-text"><?php _e( 'Search', 'twentytwenty' ); ?></span>
</span>
</button><!-- .search-toggle -->
</div>
<?php
}
?>
</div><!-- .header-toggles -->
<?php
}
?>
</div><!-- .header-navigation-wrapper -->
</div><!-- .header-inner -->
<?php
// Output the search modal (if it is activated in the customizer).
if ( true === $enable_header_search ) {
get_template_part( 'template-parts/modal-search' );
}
?>
</header><!-- #site-header -->
<?php
// Output the menu modal.
get_template_part( 'template-parts/modal-menu' );