jquery 实现弹出层效果

<head runat="server">
    <title></title>

    <script type="text/javascript" src="scripts/jquery-1.3.2-vsdoc2.js"></script>

    <script type="text/javascript">
        $(function() {
            $("#btnShow").click(function() {
               // var str = "我是弹出对话框";
              //  $(".form").html(str);
                $("#BgDiv").css({ display: "block", height: $(document).height() });
                var yscroll = document.documentElement.scrollTop;
                $("#DialogDiv").css("top", "100px");
                $("#DialogDiv").css("display", "block");
                document.documentElement.scrollTop = 0;
            });
            $("#btnClose").click(function() {
                $("#BgDiv").css("display", "none");
                $("#DialogDiv").css("display", "none");
            });
        });

    </script>

    <style type="text/css">
        body, h2
        {
            margin: 0;
            padding: 0;
        }
        #BgDiv
        {
            background-color: #e3e3e3;
            position: absolute;
            z-index: 99;
            left: 0;
            top: 0;
            display: none;
            100%;
            height: 1000px;
            opacity: 0.5;
            filter: alpha(opacity=50);
            -moz-opacity: 0.5;
        }
        #DialogDiv
        {
            position: absolute;
            400px;
            left: 50%;
            top: 50%;
            margin-left: -200px;
            height: auto;
            z-index: 100;
            background-color: #fff;
            border: 1px #8FA4F5 solid;
            padding: 1px;
        }
        #DialogDiv h2
        {
            height: 25px;
            font-size: 14px;
            background-color: #8FA4F5;
            position: relative;
            padding-left: 10px;
            line-height: 25px;
        }
        #DialogDiv h2 a
        {
            position: absolute;
            right: 5px;
            font-size: 12px;
            color: #000000;
        }
        #DialogDiv .form
        {
            padding: 10px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div id="BgDiv"></div>
    <div id="DialogDiv" style="display: none">
        <h2>
            弹出层<a href="#" id="btnClose">关闭</a></h2>
        <div class="form">
            我是弹出对话框!!<br />
            我是弹出对话框!!<br />
            我是弹出对话框!!<br />
            我是弹出对话框!!<br />
            我是弹出对话框!!<br />
            我是弹出对话框!!<br />
            我是弹出对话框!!<br />

        </div>
    </div>
    <p>
        &nbsp;</p>
    <p align="center">
        <input value="弹出" class="but" type="button" id="btnShow" />
    </p>
    </form>
</body>
</html>

原文地址:https://www.cnblogs.com/yidianfeng/p/1732402.html