jquery 纵向导航菜单

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery Vertical Navigation</title>
    <style>
        body {
            font-family: Arial, sans-serif;
        }
        ul.nav {
            list-style-type: none;
            padding: 0;
            width: 200px;
        }
        ul.nav li {
            background-color: #f1f1f1;
            margin-bottom: 5px;
            padding: 10px;
        }
        ul.nav li a {
            text-decoration: none;
            color: #333;
        }
        ul.nav li:hover {
            background-color: #ddd;
        }
    </style>
</head>
<body>
    <ul class="nav">
        <li><a href="#home">Home</a></li>
        <li><a href="#services">Services</a>
            <ul>
                <li><a href="#web-design">Web Design</a></li>
                <li><a href="#seo">SEO</a></li>
            </ul>
        </li>
        <li><a href="#about">About</a></li>
        <li><a href="#contact">Contact</a></li>
    </ul>

    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <script>
        $(document).ready(function() {
            $('.nav > li').hover(
                function() {
                    $('ul', this).stop().slideDown(200);
                },
                function() {
                    $('ul', this).stop().slideUp(200);
                }
            );
        });
    </script>
</body>
</html>