jquery 手机弹窗居中

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery 弹窗居中示例</title>
    <style>
        .popup {
            display: none;
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 80%;
            max-width: 400px;
            padding: 20px;
            background-color: white;
            box-shadow: 0 0 10px rgba(0,0,0,0.1);
            z-index: 1000;
        }
        .overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 999;
        }
    </style>
</head>
<body>

<div class="overlay"></div>
<div class="popup">
    <p>这是一个居中的弹窗！</p>
    <button id="closePopup">关闭</button>
</div>

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
    $(document).ready(function() {
        // 显示弹窗
        $('.popup, .overlay').fadeIn();

        // 关闭弹窗
        $('#closePopup').click(function() {
            $('.popup, .overlay').fadeOut();
        });
    });
</script>

</body>
</html>

@media (max-width: 600px) {
    .popup {
        width: 90%;
    }
}