jquery 展开特效

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery 展开特效示例</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <style>
        #content {
            width: 200px;
            height: 50px;
            background-color: #f0f0f0;
            overflow: hidden;
        }
    </style>
</head>
<body>
    <div id="content">点击展开更多内容</div>
    <button id="toggleBtn">展开/收缩</button>

    <script>
        $(document).ready(function() {
            $('#toggleBtn').click(function() {
                if ($('#content').height() === 50) {
                    $('#content').animate({ height: '200px' }, 500);
                } else {
                    $('#content').animate({ height: '50px' }, 500);
                }
            });
        });
    </script>
</body>
</html>