jquery 垂直导航

<!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>
        .nav {
            width: 200px;
            background-color: #f1f1f1;
            padding: 10px;
        }
        .nav ul {
            list-style-type: none;
            padding: 0;
        }
        .nav li {
            margin-bottom: 10px;
        }
        .nav a {
            text-decoration: none;
            color: #333;
        }
        .sub-menu {
            display: none;
            padding-left: 20px;
        }
    </style>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
    <div class="nav">
        <ul>
            <li><a href="#">Home</a></li>
            <li><a href="#">About</a></li>
            <li>
                <a href="#" class="has-submenu">Services</a>
                <ul class="sub-menu">
                    <li><a href="#">Web Design</a></li>
                    <li><a href="#">SEO</a></li>
                    <li><a href="#">Marketing</a></li>
                </ul>
            </li>
            <li><a href="#">Contact</a></li>
        </ul>
    </div>

    <script>
        $(document).ready(function() {
            $('.has-submenu').click(function(e) {
                e.preventDefault();
                $(this).next('.sub-menu').slideToggle();
            });
        });
    </script>
</body>
</html>

$(document).ready(function() {
    $('.has-submenu').click(function(e) {
        e.preventDefault();
        $(this).next('.sub-menu').slideToggle();
    });
});

@media (max-width: 600px) {
    .nav {
        width: 100%;
    }
}