WordPress 后台发布文章提示用户填写标签

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/**
 * WordPress 后台发布文章提示用户填写标签
 * https://www.wpdaxue.com/require-tags-before-publish.html
 */
add_action('admin_footer-post.php', 'require_tags_before_publish');
add_action('admin_footer-post-new.php', 'require_tags_before_publish');
function require_tags_before_publish(){
	global $post_type;
	if($post_type=='post'){ // 只对文章（post）生效		echo "<script>
jQuery(function($){
	$('#publish, #save-post').click(function(e){
		if($('#post_tag .tagchecklist span').length==0){
 alert('抱歉，发布文章前，请添加标签');			e.stopImmediatePropagation();
			return false;
		}else{
			return true;
		}
	});
	var publish_click_events = $('#publish').data('events').click;
	if(publish_click_events){
		if(publish_click_events.length>1){
			publish_click_events.unshift(publish_click_events.pop());
		}
	}
	if($('#save-post').data('events') != null){
		var save_click_events = $('#save-post').data('events').click;
		if(save_click_events){
		  if(save_click_events.length>1){
			  save_click_events.unshift(save_click_events.pop());
		  }
		}
	}
});
</script>";
	}
}