带缩略图的图片切换js

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Image Slider with Thumbnails</title>
    <style>
        #mainImage {
            width: 400px;
            height: 300px;
            border: 1px solid #ccc;
        }
        .thumbnail {
            width: 50px;
            height: 50px;
            margin: 5px;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <div>
        <img id="mainImage" src="image1.jpg" alt="Main Image">
    </div>
    <div>
        <img class="thumbnail" src="image1.jpg" alt="Thumbnail 1" onclick="changeImage('image1.jpg')">
        <img class="thumbnail" src="image2.jpg" alt="Thumbnail 2" onclick="changeImage('image2.jpg')">
        <img class="thumbnail" src="image3.jpg" alt="Thumbnail 3" onclick="changeImage('image3.jpg')">
    </div>

    <script>
        function changeImage(imageSrc) {
            document.getElementById('mainImage').src = imageSrc;
        }
    </script>
</body>
</html>