<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery 点击定位页面</title>
    <style>
        .content {
            height: 2000px;
        }
        .section {
            height: 500px;
            border: 1px solid #ccc;
        }
        .back-to-top {
            position: fixed;
            bottom: 20px;
            right: 20px;
        }
    </style>
</head>
<body>
    <nav>
        <a href="#section1">Section 1</a>
        <a href="#section2">Section 2</a>
        <a href="#section3">Section 3</a>
    </nav>
    <div class="content">
        <div id="section1" class="section">Section 1</div>
        <div id="section2" class="section">Section 2</div>
        <div id="section3" class="section">Section 3</div>
    </div>
    <button class="back-to-top">返回顶部</button>

    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <script>
        $(document).ready(function() {
            // 点击导航链接滚动到相应位置
            $('nav a').click(function(event) {
                event.preventDefault();
                var target = $(this).attr('href');
                $('html, body').animate({
                    scrollTop: $(target).offset().top
                }, 1000);
            });

            // 点击返回顶部按钮滚动到页面顶部
            $('.back-to-top').click(function() {
                $('html, body').animate({
                    scrollTop: 0
                }, 1000);
            });
        });
    </script>
</body>
</html>