<!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="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>test1</title>
<script>
function show(){
var div=top.document.createElement("div");
var divText=document.createTextNode("Saving");
div.appendChild(divText);
div.style.width=top.document.documentElement.scrollWidth+"px";
div.style.height=top.document.documentElement.scrollHeight+"px";
div.style.backgroundColor="gray";
div.style.position="absolute";
div.style.left=0;
div.style.top=0;
div.style.zIndex=9999;
if(top.document.all)
div.style.filter = "alpha(opacity=30)";
else div.style.opacity = .3;
top.document.getElementById("ddd").appendChild(div);
alert("真棒");
}
</script>
</head>
<body>
<div id="ddd">
<input type="button" value="click" onclick="show()" />
</div>
</body>
</html>
JS_CSS_logon_Mask,布布扣,bubuko.com
原文：http://www.cnblogs.com/MarchThree/p/3840817.html