jquery 翻牌倒计时

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery 翻牌倒计时</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <style>
        .card {
            width: 200px;
            height: 200px;
            background-color: #ccc;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 24px;
        }
    </style>
</head>
<body>
    <div class="card">10</div>

    <script>
        $(document).ready(function() {
            var countdown = 10; // 初始倒计时时间
            var interval = setInterval(function() {
                countdown--;
                $('.card').text(countdown);

                if (countdown <= 0) {
                    clearInterval(interval);
                    $('.card').text('时间到！').css('background-color', 'red');
                }
            }, 1000);
        });
    </script>
</body>
</html>