<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>flex上下固定中间滚动布局</title>
<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport">
<style type="text/css">
*{padding: 0;margin: 0;}
html,body{height: 100%}
.wrap{width: 100%;height: 100%;}
.header,.footer{height:40px;line-height:40px;}
.main{overflow:auto;-webkit-overflow-scrolling: touch;}
/* ============================================================
flex：定义布局为盒模型
flex-v：盒模型垂直布局
flex-1：子元素占据剩余的空间
flex-align-center：子元素垂直居中
flex-pack-center：子元素水平居中
flex-pack-justify：子元素两端对齐
兼容性：ios 4+、android 2.3+、winphone8+
============================================================ */
.flex{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;}
.flex-v{-webkit-box-orient:vertical;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;}
.flex-1{-webkit-box-flex:1;-webkit-flex:1;-ms-flex:1;flex:1;}
.flex-align-center{-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;}
.flex-pack-center{-webkit-box-pack:center;-webkit-justify-content:center;-ms-flex-pack:center;justify-content:center;}
.flex-pack-justify{-webkit-box-pack:justify;-webkit-justify-content:space-between;-ms-flex-pack:justify;justify-content:space-between;}
</style>
</head>
<body>
<div class="wrap flex flex-v">
<div class="header">我想要它固定顶部部</div>
<div class="main flex-1">
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p><input value="54545455654"/></p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
<p>高度自动适应</p>
</div>
<div class="footer">我想要它固定底部<input value="54545455654"/></div>
</div>
</body>
</html>