jquery 打开页面弹出层

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery 弹出层示例</title>
    <style>
        /* 模态框样式 */
        .modal {
            display: none;
            position: fixed;
            z-index: 1;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0,0,0,0.4);
        }
        .modal-content {
            background-color: #fefefe;
            margin: 15% auto;
            padding: 20px;
            border: 1px solid #888;
            width: 80%;
        }
        .close {
            color: #aaa;
            float: right;
            font-size: 28px;
            font-weight: bold;
        }
        .close:hover,
        .close:focus {
            color: black;
            text-decoration: none;
            cursor: pointer;
        }
    </style>
</head>
<body>

<button id="openModalBtn">打开弹出层</button>

<div id="myModal" class="modal">
    <div class="modal-content">
        <span class="close">&times;</span>
        <p>这是一个弹出层！</p>
    </div>
</div>

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
    $(document).ready(function(){
        // 打开弹出层
        $("#openModalBtn").click(function(){
            $("#myModal").show();
        });

        // 关闭弹出层
        $(".close").click(function(){
            $("#myModal").hide();
        });

        // 点击模态框外部区域关闭弹出层
        $(window).click(function(event){
            if (event.target.className === "modal") {
                $("#myModal").hide();
            }
        });
    });
</script>

</body>
</html>