jquery div滚动到顶部

<!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>
        #scroll-to-top {
            display: none;
            position: fixed;
            bottom: 20px;
            right: 30px;
            z-index: 99;
            font-size: 18px;
            border: none;
            outline: none;
            background-color: #555;
            color: white;
            cursor: pointer;
            padding: 15px;
            border-radius: 4px;
        }

        #scroll-to-top:hover {
            background-color: #777;
        }
    </style>
</head>
<body>

<div style="height: 2000px;">
    <p>Scroll down to see the "scroll to top" button.</p>
</div>

<button id="scroll-to-top" title="Go to top">Top</button>

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

        $('#scroll-to-top').click(function() {
            $('html, body').animate({ scrollTop: 0 }, 800);
            return false;
        });
    });
</script>

</body>
</html>