[Typecho小试牛刀]Joe主题增加验证码（非插件方式）

#生成验证码
function comment_protection_code(){
    $num1=rand(1,9);
    $num2=rand(1,9);
    $rand=rand(1,100)%3;
    switch($rand){
        case 0:
            $ret=$num1 + $num2;
            $symbol='＋';
        break;
        case 1:
            $ret=$num1 - $num2;
            $symbol='－';
        break;
        case 2:
            $ret=$num1 * $num2;
            $symbol='×';
        break;
    }
    $_SESSION['verify']=$ret;
    $_SESSION['verify_md5']=md5($num1.$num2);
    echo "<input type=\"text\" autocomplete=\"off\" name=\"sum\" placeholder=\"$num1 $symbol $num2 = ?\" />";
    echo "<input type=\"hidden\" name=\"num1\" value=\"$num1\">\n";
    echo "<input type=\"hidden\" name=\"num2\" value=\"$num2\">";
}
#验证
function comment_protection_do($comment, $post, $result){
    if(md5($_SESSION['verify']) != md5($_POST['sum']) || $_SESSION['verify_md5'] != md5($_POST['num1'].$_POST['num2'])){
        throw new Typecho_Widget_Exception(_t('对不起: 验证码错误，请重试。','评论失败'), 200);
    }
    return $comment;
}
#判断路由用到
function endsWith($haystack, $needle){
    return $needle === '' || substr_compare($haystack, $needle, -strlen($needle)) === 0;
}

#仅在提交评论时生效
if(endsWith($self->request->getPathInfo(), '/comment')){
    $comment = comment_protection_do($comment, $post, $result);
}

...
<div class="list">
    <input type="text" autocomplete="off" name="url" placeholder="请输入网址（非必填）..." />
</div>
#上方为原始代码
#下方为新增
<!-- @苏苏修改 增加验证码输入框-->
<div class="list">
    <?php comment_protection_code();?>
</div>

       /* 激活评论提交 已修改 */
	{
		if ($('.joe_comment').length) {
			let isSubmit = false;
			$('.joe_comment__respond-form').on('submit', function (e) {
				e.preventDefault();
				const action = $('.joe_comment__respond-form').attr('action') + '?time=' + +new Date();
				const type = $('.joe_comment__respond-form').attr('data-type');
				const parent = $('.joe_comment__respond-form').attr('data-coid');
				const author = $(".joe_comment__respond-form .head input[name='author']").val();
				const _ = $(".joe_comment__respond-form input[name='_']").val();
				const mail = $(".joe_comment__respond-form .head input[name='mail']").val();
				const url = $(".joe_comment__respond-form .head input[name='url']").val();
				const sum = $(".joe_comment__respond-form .head input[name='sum']").val();
				const num1 = $(".joe_comment__respond-form .head input[name='num1']").val();
				const num2 = $(".joe_comment__respond-form .head input[name='num2']").val();
				let text = $(".joe_comment__respond-form .body textarea[name='text']").val();
				if (sum === '') return Qmsg.info('请输入验证信息！');
				if (author.trim() === '') return Qmsg.info('请输入昵称！');
				if (!/\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/.test(mail)) return Qmsg.info('请输入正确的邮箱！');
				if (type === 'text' && text.trim() === '') return Qmsg.info('请输入评论内容！');
				if (type === 'draw') {
					const txt = $('#joe_comment_draw')[0].toDataURL('image/webp', 0.1);
					text = '{!{' + txt + '}!} ';
				}
				if (isSubmit) return;
				isSubmit = true;
				$('.joe_comment__respond-form .foot .submit button').html('发送中...');
				$.ajax({
					url: action,
					type: 'POST',
					data: { author, mail, text, parent, url, num1, num2, sum, _ },
					dataType: 'text',
					success(res) {
						let arr = [],
							str = '';
						arr = $(res).contents();
						Array.from(arr).forEach(_ =### {
							if (_.parentNode.className === 'container') str = _;
						});
						if (!/Joe/.test(res)) {
							Qmsg.warning(str.textContent.trim() || '');
							isSubmit = false;
							$('.joe_comment__respond-form .foot .submit button').html('发表评论');
						} else {
							window.location.reload();
						}
					},
					error(res) {
						isSubmit = false;
						$('.joe_comment__respond-form .foot .submit button').html('发表评论');
						Qmsg.warning('发送失败！请刷新重试！');
					}
				});
			});
		}
	}

/*验证码处css*/
@media (min-width: 768px){.joe_comment__respond-form .head .list:nth-child(4){position:relative}.joe_comment__respond-form .head .list:nth-child(4)::before{content:'';position:absolute;top:50%;transform:translateY(-50%);width:1px;height:15px;background:var(--classA)}.joe_comment__respond-form .head .list:nth-child(4)::before{left:0}}