jquery 可伸缩侧边栏

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery 可伸缩侧边栏</title>
    <style>
        #sidebar {
            width: 250px;
            height: 100%;
            background-color: #333;
            color: white;
            position: fixed;
            top: 0;
            left: -250px;
            transition: left 0.3s ease;
        }
        #sidebar.active {
            left: 0;
        }
        #toggle-btn {
            position: fixed;
            top: 10px;
            left: 10px;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <div id="sidebar">
        <h2>侧边栏</h2>
        <ul>
            <li>菜单项 1</li>
            <li>菜单项 2</li>
            <li>菜单项 3</li>
        </ul>
    </div>
    <div id="toggle-btn">☰</div>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <script>
        $(document).ready(function() {
            $('#toggle-btn').click(function() {
                $('#sidebar').toggleClass('active');
            });
        });
    </script>
</body>
</html>