Jquery点击弹出遮罩层

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<script src="../API/jquery-2.1.4.min.js" type="text/javascript"></script>
<style>
    .black_overlay{
        display: none;
        position: absolute;
        top: 0%;
        left: 0%;
        width: 100%;
        height: 100%;
        background-color: black;
        z-index:1001;
        -moz-opacity: 0.8;
        opacity:.80;
        filter: alpha(opacity=80);
    }
    .white_content {
        display: none;
        position: absolute;
        top:40%;
        left: 40%;
        width: 20%;
        height: 20%;
        border: 5px solid lightblue;
        background-color: white;
        z-index:1002;
        overflow: auto;
    }
    .white_content_small {
        display: none;
        position: absolute;
        top: 20%;
        left: 30%;
        width: 40%;
        height: 50%;
        border: 16px solid lightblue;
        background-color: white;
        z-index:1002;
        overflow: auto;
    }
</style>
<script type="text/javascript">
    //弹出隐藏层
    function ShowDiv(show_div,bg_div){
        document.getElementById(show_div).style.display='block';
        document.getElementById(bg_div).style.display='block' ;
        var bgdiv = document.getElementById(bg_div);
        bgdiv.style.width = document.body.scrollWidth;
// bgdiv.style.height = $(document).height();
        $("#"+bg_div).height($(document).height());
    };
    //关闭弹出层
    function CloseDiv(show_div,bg_div)
    {
        document.getElementById(show_div).style.display='none';
        document.getElementById(bg_div).style.display='none';
    };
</script>
</head>
<body>
<input id="Button1" type="button" value="点击弹出层" onclick="ShowDiv('MyDiv','fade')" />
<!--弹出层时背景层DIV-->
<div id="fade" class="black_overlay">
</div>
<div id="MyDiv" class="white_content">
    <div style="text-align: right; cursor: default; height: 40px;">
        <span style="font-size: 16px;font-family: 微软雅黑;cursor: pointer" onclick="CloseDiv('MyDiv','fade')">关闭</span>
    </div>
    目前来说，我还是喜欢这个自己改造的弹出层。自己在项目中也用的是这个。
</div>

</body>
</html>
Jquery点击弹出遮罩层

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