需求：随着页面高度变化，中间区域的头部固定，不随页面高度的变化而跟随滚动
解决方案：粘性定位， 记得设置 z-index属性。
固定定位不可行，会随着页面高度的变化超出中间区域，不符合要求。
代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
.box {
height: 300px;
width: 100%;
margin: 0 auto;
background-color: red;
position: relative;
overflow: scroll;
margin-top: 20px;
}
.abso{
position: sticky;
top: 0;
left:0;
width: 110%;
height: 50px;
background-color: green;
}
.msg{
width: 110%;
height: 600px;
background: red;
}
</style>
</head>
<body>
<div class="box">
<div class="abso">
123123
</div>
<div class="msg">
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
</div>
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
.box {
height: 300px;
width: 100%;
margin: 0 auto;
background-color: red;
position: relative;
overflow: scroll;
margin-top: 20px;
}
.abso{
position: sticky;
top: 0;
left:0;
width: 110%;
height: 50px;
background-color: green;
}
.msg{
width: 110%;
height: 600px;
background: red;
}
</style>
</head>
<body>
<div class="box">
<div class="abso">
123123
</div>
<div class="msg">
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
<p>123123sdasd</p>
</div>
</div>
</body>
</html>
转载：http://t.csdn.cn/3EA3I
标签：box,定位,margin,粘性,height,width,日常,background,123123sdasd From： https://www.cnblogs.com/huguo/p/16854670.html