jquery 图片切换倒计时

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery 图片切换倒计时</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <style>
        .slider {
            position: relative;
            width: 600px;
            height: 400px;
            overflow: hidden;
        }
        .slider img {
            position: absolute;
            width: 100%;
            height: 100%;
            opacity: 0;
            transition: opacity 1s ease-in-out;
        }
        .slider img.active {
            opacity: 1;
        }
        .timer {
            text-align: center;
            font-size: 24px;
            margin-top: 10px;
        }
    </style>
</head>
<body>
    <div class="slider">
        <img src="image1.jpg" alt="Image 1" class="active">
        <img src="image2.jpg" alt="Image 2">
        <img src="image3.jpg" alt="Image 3">
    </div>
    <div class="timer">5</div>

    <script>
        $(document).ready(function() {
            var images = $('.slider img');
            var currentIndex = 0;
            var timer = 5000; // 5 seconds
            var countdown = 5;

            function showImage(index) {
                images.removeClass('active').eq(index).addClass('active');
            }

            function startTimer() {
                var interval = setInterval(function() {
                    countdown--;
                    $('.timer').text(countdown);
                    if (countdown <= 0) {
                        clearInterval(interval);
                        currentIndex = (currentIndex + 1) % images.length;
                        showImage(currentIndex);
                        countdown = 5;
                        startTimer();
                    }
                }, 1000);
            }

            startTimer();
        });
    </script>
</body>
</html>