1.描述
百度登录就是一个模态框弹出层。思路分析：先将灰色大背景和登陆盒子设为不可见，利用JS将其动态加载可见。
2、代码
<!DOCTYPE html>
<html>
<head>
<title>模态框弹出层.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
<style>
*{margin:0;padding:0;}
body{
width:100%;
height:10000000px;
}
#mask{
display:none;
background:rgba(0,0,0,0.3);
width:100%;
height:100%;
position:fixed;//利用固定定位的好处：页面还可以上下翻动，但是始终处于灰色背景下
}
#login{
display:none;
background:white;
width:400px;
height:250px;
position:absolute;
left:50%;
top:50%;
margin-left:-200px;
margin-top:-125px;
}
#login #close_login{
position:absolute;
left:350px;
top:10px;
font-size:20px;
width:20px;
height:20px;
background:skyblue;
cursor:pointer;
}
</style>
<script type="text/javascript">
window.onload=function(){
var btn=document.getElementById("btn");
var mask=document.getElementById("mask");
var login=document.getElementById("login");
btn.onclick=function(){
mask.style.display="block";
login.style.display="block";
};
var close_login=document.getElementById("close_login");
close_login.onclick=function(){
mask.style.display="none";
login.style.display="none";
};
};
</script>
</head> <body>
<div id="mask"></div>
<div id="login">
<span id="close_login">×</span>
</div>
<a href="javascript:;" id="btn">请登录</a>
</body>
</html>