DIV全屏覆盖网页

<!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" xml:lang="zh-CN" lang="zh-CN">
    <head>
        <meta name="verify-v1" content="P4T6fFCiPVxqMWZ2eztyXVzMHlnwD0wLQOq6LBHN5Y8=" />
        <title>
            test</title>
        <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
        <meta http-equiv="Content-Language" content="gb2312" />
        <meta name="KeyWords" content="电力工程造价,价格信息,装材,设备,电力工程" />
        <meta name="description" content="电力工程造价信息" />
        <style type="text/css">
            *{
                margin:0;padding:0;
            }
        </style>
    </head>
    <body>

    <div class="cecmbody" id="cecmpolicy">
        <div class="leftClass">

<p>测试</p><p>测试</p>
            <p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p>
            <p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p>
            <input type="button" value="点击这里" onclick="sAlert('测试效果');" />
            <a href="#" onclick="sAlert('test');">测试</a>

        </div>
        <div class="rightClass">
        </div>
    </div>
                <script type="text/javascript" language="javascript">
//Author:Daviv
//Blog:http://blog.163.com/jxdawei
//Date:2006-10-27
//Email:jxdawei@gmail.com
            function sAlert(str){
            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.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>

http://bbs.blueidea.com/thread-2813409-1-1.html

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原文地址：https://www.cnblogs.com/chen110xi/p/2599368.html