jquery 菜单选中

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery Menu Selection</title>
    <style>
        .selected {
            background-color: #f1f1f1;
        }
    </style>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
    <ul id="menu">
        <li>Home</li>
        <li>About</li>
        <li>Services</li>
        <li>Contact</li>
    </ul>

    <script>
        $(document).ready(function() {
            $('#menu li').click(function() {
                // 移除所有菜单项的选中状态
                $('#menu li').removeClass('selected');
                // 为当前点击的菜单项添加选中状态
                $(this).addClass('selected');
            });
        });
    </script>
</body>
</html>