1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2 <html xmlns="http://www.w3.org/1999/xhtml">
3 <head>
4 <title>DIV CSS遮罩层</title>
5 <script language="javascript" type="text/javascript">
6 function showdiv() {
7 document.getElementById("bg").style.display ="block";
8 document.getElementById("show").style.display ="block";
9 }
10 function hidediv() {
11 document.getElementById("bg").style.display ='none';
12 document.getElementById("show").style.display ='none';
13 }
14 </script>
15 <style type="text/css">
16 #bg{ display: none; position: absolute; top: 0%; left: 0%; width: 100%; height: 100%; background-color: black; z-index:1001; -moz-opacity: 0.7; opacity:.70; filter: alpha(opacity=70);}
17 #show{display: none; position: absolute; top: 25%; left: 22%; width: 53%; height: 49%; padding: 8px; border: 8px solid #E8E9F7; background-color: white; z-index:1002; overflow: auto;}
18 </style>
19 </head>
20 <body>
21 <input id="btnshow" type="button" value="Show" onclick="showdiv();"/>
22 <div id="bg"></div>
23 <div id="show">测试
24 <input id="btnclose" type="button" value="Close" onclick="hidediv();"/>
25 </div>
26 </body>
27 </html>
来源：https://www.cnblogs.com/xuzhiheng/archive/2013/05/28/3104237.html