jquery 弹窗动画

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery 弹窗动画示例</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <style>
        #popup {
            display: none;
            padding: 20px;
            background-color: #fff;
            border: 1px solid #ccc;
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }
    </style>
</head>
<body>
    <button id="showPopup">显示弹窗</button>
    <div id="popup">
        这是一个弹窗！
    </div>

    <script>
        $(document).ready(function() {
            $('#showPopup').click(function() {
                $('#popup').fadeIn(1000, function() {
                    setTimeout(function() {
                        $('#popup').fadeOut(1000);
                    }, 3000);
                });
            });
        });
    </script>
</body>
</html>