wordpress language switch, no refesh, cookie remember；多语言切换，不刷新页面，cookie 记住当前语言

functions.php

<?php
// /wp-content/themes/****/functions.php
add_filter( 'body_class', 'lang_body_classes' );
function lang_body_classes( $classes ) {
	if($_GET['lang']=='en' || $_COOKIE['lang']=='en'){
		$classes[] = 'en';
		@setcookie('lang', 'en');
	}
	return $classes;
}
?>

head.php.htm

<!-- /wp-content/themes/****/header.php -->
<div class="lang"><span data-lang="cn">中文</span> <span data-lang="en">English</span></div>
<script type="text/javascript">
jQuery('.lang span').click(function(){
	var lang=jQuery(this).attr('data-lang');
	document.cookie='lang='+lang;
	jQuery('body').removeClass('cn en').addClass(lang);
});
</script>
<style type="text/css">
.en, body.en .cn{display: none;}
body.en, body.en .en{display: block;}
</style>

Post Content, 正文内容应该包含两套标签:
Any HTML tag (span, p, or div),

<tag class="cn">中文内容</tag>
<tag class="en">Chinese Content</tag>

remove all filters 移除对应的 HTML 标签过滤函数, esc_attr, esc_url, esc_attr_e, esc_html