index.html

<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>图片切换</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <h1 class="centered-title">edg牛逼</h1>
    <div class="container">
        <div class="image-container">
            <button class="darken-button" onclick="darkenImage()">变暗</button>
            <img id="largeImage" class="large-image" src="thumb1.jpg" alt="大图片">
        </div>
        <div>
            <img class="thumbnail" src="thumb1.jpg" alt="小图片1" onclick="changeImage('thumb1.jpg')">
            <img class="thumbnail" src="thumb2.jpg" alt="小图片2" onclick="changeImage('thumb2.jpg')">
            <img class="thumbnail" src="thumb3.jpg" alt="小图片3" onclick="changeImage('thumb3.jpg')">
        </div>
    </div>

    <script src="scripts.js"></script>
</body>
</html>