层的半透明，和被层覆盖的页面不能被操作，怎么实现

点击一个按钮或一个连接，一个层浮在整个页面的上面，整个页面就像是被磨砂玻璃盖着一样的视觉效果，层下面的东西不能操作，只有层上面的可以操作类似这个页面选择人物时的效果http://in.sg.kunlun.com/template/nvvsafreet/?u=178&u2=qihu07大家有教程或者什么参考的麻烦给我发一下，谢谢了

解决方案 »

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http://www.cnblogs.com/cloudgamer/archive/2008/09/15/1290954.html
可以参考cloudgamer的
用div,设置zIndex、背景色及透明度
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>mask demo</title></head>
<style type="text/css">

</style>
<body>
<div id="app">
  <p>另外一些文字</p>
  <p>
    <input type="button" value="关闭" onclick="with(document){getElementById('mask').style.display=getElementById('app').style.display='none';}" />
  </p>
  <p><a href="#">另外一些链接</a></p>
</div>
<div id="mask"></div>
<p>一些文字</p>
<p>
  <input type="button" value="弹出" onclick="with(document){getElementById('mask').style.display=getElementById('app').style.display='';}" />
</p>
<p><a href="#">一些链接</a></p>
</body>
</html>
如果严格要求被覆盖的层不能被操作，请切记处理好Tab键切换。
两年前写的，贴给你<html>
    <head>
    <title>test div</title>
    <style>
            #dlg{
                    height: 200px;
                    width: 350px;
                    border: solid black 1px;
            }
            td{
                    padding: 5px;
            }
    </style>
    <style type="text/css">

    </style>
    <script language="javascript">
        //mask为遮盖层div，
        function showDialog(){
            var masklayer = document.all("mask") ;
            masklayer.style.width = screen.width ;
            masklayer.style.height = screen.height ;
            masklayer.style.display = "" ;
            var dlg = document.getElementById("dlg");
            dlg.style.display = "";
        }
        function hideDialog(){
            var masklayer = document.all("mask") ;
            masklayer.style.display = "none" ;
            var dlg = document.getElementById("dlg");
            dlg.style.display = "none";
        }
    function doEscape(){
        var masklayer = document.all("mask") ;
        var dlg = document.getElementById("dlg") ;
        if(masklayer.style.display==""||mask.style.display==""){
            if (event.ctrlKey){
                alert("event.key") ;
            }
        }
    }
    </script>
    <body>
        <input type="submit" value="Show dialog" onClick="showDialog();">
        <div id="mask" name="mask" style="position:absolute;left:0px;top:0px;display:none;z-index:999;filter:alpha(opacity=40);background-color:silver"></div>
        <div id="dlg"  onkeydown="doEscape();" name="dlg" style="position:absolute;display:none;left:380px;top:250px;z-index:1000;border:1px;border-color:red">
        <table border=1 height="200" width="350" aligh="center" style="border-collapse:collapse;background-color:#eeeeee;"><tr><td>This is a customer dialog</td></tr><tr><td>
        <input type="submit" value="Close dialog" onClick="hideDialog();"></td></tr><tr><td></td></tr></table></div>
    </body>
</html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head><body oncontextmenu = "return false">
<div class="cecmbody" id="cecmpolicy">
      <div class="leftClass">
             <p>测试</p>
       <input type="button" value="点击这里" onclick="sAlert('<a href=http://www.uxing.cn/>测试效果</a>');" />

      </div>
      <div class="rightClass">
      </div>
</div>
        <script type="text/javascript" language="javascript">       function sAlert(str){
       document.body.style.overflow = "hidden";
       var msgw,msgh,bordercolor;
       msgw=400;//提示窗口的宽度
       msgh=100;//提示窗口的高度
       titleheight=25 //提示窗口标题高度
       bordercolor="#336699";//提示窗口的边框颜色
       titlecolor="#99CCFF";//提示窗口的标题颜色

       var sWidth,sHeight;
       sWidth=document.body.offsetWidth;
       sHeight=screen.height;
       var bgObj=document.createElement("div");
       bgObj.setAttribute('id','bgDiv');
       bgObj.style.position="absolute";
       bgObj.style.top="0";
       bgObj.style.background="#777";
       bgObj.style.filter="progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";
       bgObj.style.opacity="0.6";
       bgObj.style.left="0";
       bgObj.style.width=sWidth + "px";
       bgObj.style.height=sHeight + "px";
       bgObj.style.zIndex = "10000";
       document.body.appendChild(bgObj);

       var msgObj=document.createElement("div")
       msgObj.setAttribute("id","msgDiv");
       msgObj.setAttribute("align","center");
       msgObj.style.background="white";
       msgObj.style.border="1px solid " + bordercolor;
           msgObj.style.position = "absolute";
       msgObj.style.left = "50%";
                  msgObj.style.top = "50%";
                  msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
                  msgObj.style.marginLeft = "-225px" ;
                  msgObj.style.marginTop = -75+document.documentElement.scrollTop+"px";
                  msgObj.style.width = msgw + "px";
                  msgObj.style.height =msgh + "px";
                  msgObj.style.textAlign = "center";
                  msgObj.style.lineHeight ="25px";
                  msgObj.style.zIndex = "10001";

         var title=document.createElement("h4");
         title.setAttribute("id","msgTitle");
         title.setAttribute("align","right");
         title.style.margin="0";
         title.style.padding="3px";
         title.style.background=bordercolor;
         title.style.filter="progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);";
         title.style.opacity="0.75";
         title.style.border="1px solid " + bordercolor;
         title.style.height="18px";
         title.style.font="12px Verdana, Geneva, Arial, Helvetica, sans-serif";
         title.style.color="white";
         title.style.cursor="pointer";
         title.innerHTML="关闭";
         title.onclick=function(){
              document.body.removeChild(bgObj);
                    document.getElementById("msgDiv").removeChild(title);
                    document.body.removeChild(msgObj);
                    document.body.style.overflow = "auto";
                    }
         document.body.appendChild(msgObj);
         document.getElementById("msgDiv").appendChild(title);
         var txt=document.createElement("p");
         txt.style.margin="1em 0"
         txt.setAttribute("id","msgTxt");
         txt.innerHTML=str;
               document.getElementById("msgDiv").appendChild(txt);
                }
      </script></body>
</html>
刚学js时是把51job.com下来，按着做了一遍。有你想要的。
顶楼主，baidu搜下，N多的，主要思路是控制层的上下关系，还有得到浏览器的坐标，