JS应用：模拟弹出层拖动效果。看代码吧。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>拖动模态框</title>
<style>
body {
padding: 0;
margin: 0;
}
.login {
display: none;
position: fixed;
top: 50%;
left:50%;
box-sizing:border-box;
width:400px;
height: 200px;
background-color: pink;
box-shadow: 0px 0px 20px #ddd;
z-index: 9999;
transform: translate(-50%, -50%);
/* 让一个固定定位的盒子 垂直居中 */
}
h4 {
text-align: center;
line-height: 70px;
}
form {
text-align: center;
margin-left: 40px;
}
a {
text-decoration: none;
text-align: center;
}
.finish {
position: absolute;
top:-15px;
right:-15px;
width: 30px;
height: 30px;
border: 1px solid white;
border-radius: 50%;
background-color: white;
font-size: 10px;
line-height: 30px;
}
.login-bg {
display: none;
width: 100%;
height: 100%;
position: fixed;
top:0px;
left: 0px;
background-color: rgba(0,0,0,0.3);
}
.title {
width: 400px;
height: 50px;
cursor: move;
margin-top: -20px;
height: 70px;
}
</style>
</head>
<body>
<div class="bg">
<div class="link"><a href="javascript:;" >点击，弹出登录框</a></div>
<div class="login">
<div class="finish">关闭</div>
<div class = "title"><h4>登录会员</h4></div>
<form action="">
<table>
<tr>
<td>用户名：</td>
<td><input type="text" name="" id="" value="请输入用户名"></td>
</tr>
<tr>
<td>登录密码：</td>
<td><input type="text" name="" id="" value="请输入密码"></td>
</tr>
</table>
<input type="submit" name="" id="" value="登录会员">
</form>
</div>
</div>
<!-- 遮盖层 -->
<div id="bg" class="login-bg"></div>
<script>
var a = document.querySelector('a');
var login = document.querySelector('.login');
var mask = document.querySelector('.login-bg');
var finish = document.querySelector('.finish');
a.addEventListener('click',function() {
login.style.display = 'block';
mask.style.display = 'block';
});
finish.addEventListener('click', function(){
login.style.display = 'none';
mask.style.display = 'none';
})
var title = document.querySelector('.title');
title.addEventListener('mousedown', function(e){
var x = e.pageX - login.offsetLeft;
var y = e.pageY - login.offsetTop;
// 鼠标移动的时候，把鼠标在页面中的坐标，减去 鼠标在盒子内的坐标就是模态框的left和top值。
document.addEventListener('mousemove', move)
function move(e) {
// 别忘了加单位。
login.style.left = e.pageX - x + 'px';
login.style.top = e.pageY - y + 'px';
}
// 鼠标弹起，让鼠标移动事件停止。
document.addEventListener('mouseup', function() {
document.removeEventListener('mousemove', move);
})
})
</script>
</body>
</html> 
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