js的popUp效果

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<!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=gb2312" />
<title></title>
<STYLE>
 #login{
 position: relative;
 display: none;
 top: 20px;
 left: 30px;
 background-color: #ffffff;
 text-align: center;
 border: solid 1px;
 padding: 10px;
 z-index: 1;
 }

</STYLE>

<script type="text/javascript">

var W = screen.width;//取得屏幕分辨率宽度
var H = screen.height;//取得屏幕分辨率高度

function M(id){
 return document.getElementById(id);//用M()方法代替document.getElementById(id)
}
function MC(t){
 return document.createElement(t);//用MC()方法代替document.createElement(t)
};
//判断浏览器是否为IE
function isIE(){
 return (document.all && window.ActiveXObject && !window.opera) ? true : false;
}
//取得页面的高宽
function getBodySize(){
 var bodySize = [];
 with(document.documentElement) {
 bodySize[0] = (scrollWidth>clientWidth)?scrollWidth:clientWidth;//如果滚动条的宽度大于页面的宽度，取得滚动条的宽度，否则取页面宽度
 bodySize[1] = (scrollHeight>clientHeight)?scrollHeight:clientHeight;//如果滚动条的高度大于页面的高度，取得滚动条的高度，否则取高度
 }
 return bodySize;
}
//创建遮盖层
function popCoverDiv(){
 if (M("cover_div")) {
 //如果存在遮盖层，则让其显示
 M("cover_div").style.display = 'block';
 } else {
 //否则创建遮盖层
 var coverDiv = MC('div');
 document.body.appendChild(coverDiv);
 coverDiv.id = 'cover_div';
 with(coverDiv.style) {
 position = 'absolute';
 background = '#CCCCCC';
 left = '0px';
 top = '0px';
 var bodySize = getBodySize();
 width = bodySize[0] + 'px'
 height = bodySize[1] + 'px';
 zIndex = 0;
 if (isIE()) {
 filter = "Alpha(Opacity=60)";//IE逆境
 } else {
 opacity = 0.6;
 }
 }
 }
}

//让登陆层显示为块
 function showLogin()
 {
 var login=M("login");
 login.style.display = "block";
 }

//设置DIV层的样式
function change(){
 var login = M("login");
 login.style.position = "absolute";
 login.style.border = "1px solid #CCCCCC";
 login.style.background ="#F6F6F6";
 var i=0;
 var bodySize = getBodySize();
 login.style.left = (bodySize[0]-i*i*4)/2+"px";
 login.style.top = (bodySize[1]/2-100-i*i)+"px";
 login.style.width = i*i*4 + "px";
 login.style.height = i*i*1.5 + "px";

 popChange(i);
}
//让DIV层大小循环增大
function popChange(i){
 var login = M("login");
 var bodySize = getBodySize();
 login.style.left = (bodySize[0]-i*i*4)/2+"px";
 login.style.top = (bodySize[1]/2-100-i*i)+"px";
 login.style.width = i*i*4 + "px";
 login.style.height = i*i*1.5+ "px";
 if(i<=10){
 i++;
 setTimeout("popChange("+i+")",10);//设置超时10毫秒
 }
}
//打开DIV层
function openLiuzm()
{
 change();
 showLogin();
 popCoverDiv()
 void(0);//不进行任何操作,如：<a href="#">aaa</a>
}
//关闭DIV层
function close(){
 M('login').style.display = 'none';
 M("cover_div").style.display = 'none';
 void(0);
}

</script>
</head>

<body>

 <input type="button" onclick="javascript:openLiuzm();" value="注册用户" />
 
 asdfsadfsdf
 
 
<div id="login">
 欢迎登陆liuzm博客
 <div id="panel">
 <lable>用户名: </lable><input type="text" size="20" value="www.liuzm.com"/>

 <lable>密码: </lable><input type="password" size="20">
 </div>
 <input type="button" value="提交" />
 <a href="javascript:close();">关闭</a>
</div>
</body>
</html>

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原文地址：https://www.cnblogs.com/derrck/p/2001769.html