banner轮播图js代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Banner轮播图</title>
    <style>
        .banner {
            width: 100%;
            overflow: hidden;
            position: relative;
        }
        .banner img {
            width: 100%;
            display: none;
        }
        .banner img.active {
            display: block;
        }
        .controls {
            position: absolute;
            bottom: 10px;
            width: 100%;
            text-align: center;
        }
        .controls button {
            margin: 0 5px;
        }
    </style>
</head>
<body>
    <div class="banner">
        <img src="image1.jpg" alt="Image 1" class="active">
        <img src="image2.jpg" alt="Image 2">
        <img src="image3.jpg" alt="Image 3">
        <div class="controls">
            <button onclick="prev()">Prev</button>
            <button onclick="next()">Next</button>
        </div>
    </div>

    <script>
        let currentIndex = 0;
        const images = document.querySelectorAll('.banner img');

        function showImage(index) {
            images.forEach((img, i) => {
                img.classList.remove('active');
            });
            images[index].classList.add('active');
        }

        function next() {
            currentIndex = (currentIndex + 1) % images.length;
            showImage(currentIndex);
        }

        function prev() {
            currentIndex = (currentIndex - 1 + images.length) % images.length;
            showImage(currentIndex);
        }

        // 自动轮播
        setInterval(next, 3000);
    </script>
</body>
</html>