jquery 滚动顶部

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Scroll to Top Example</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <style>
        #scrollToTopButton {
            display: none;
            position: fixed;
            bottom: 20px;
            right: 20px;
            padding: 10px 20px;
            background-color: #007bff;
            color: white;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <div style="height: 2000px;">
        <!-- 页面内容 -->
    </div>
    <button id="scrollToTopButton">Scroll to Top</button>

    <script>
        $(document).ready(function() {
            $(window).scroll(function() {
                if ($(this).scrollTop() > 100) {
                    $('#scrollToTopButton').fadeIn();
                } else {
                    $('#scrollToTopButton').fadeOut();
                }
            });

            $('#scrollToTopButton').click(function() {
                $('html, body').animate({ scrollTop: 0 }, 'slow');
            });
        });
    </script>
</body>
</html>