1、头部和底部固定，中间内容滚动，不涉及fixed
1)absolute与height:100%
<!DOCTYPE html>
<html>
<head>
<meta charset=”utf-8″>
<meta name=”viewport” content=”initial-scale=1.0, maximum-scale=1.0, user-scalable=no” />
<title></title>
<style>
html{height: 100%;}
body{padding:0px;margin:0px;overflow: hidden;height: 100%;}
header{height: 50px;line-height: 50px;background: red;text-align: center;}
section{height: 100%;overflow-y: auto;}
.content{padding-bottom: 100px;}
footer{height: 50px;line-height: 50px;background: red;position: absolute;width: 100%;bottom: 0px;text-align: center;}
</style>
</head>
<body>
<header>我是头部</header>
<section>
<div class=”content”></div>
</section>
<footer>我是底部</footer>
</body>
</html>
2) flex与 height: 100vh
<!DOCTYPE html>
<html><head> <meta charset=”utf-8″> <meta name=”viewport” content=”width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no”> <style> body { margin: 0px; padding: 0px; } .main { display: flex; flex-direction: column; height: 100vh; } header { height: 50px; line-height: 50px; background: #ddd; text-align: center;} section { overflow-y: auto; } footer { height: 50px; line-height: 50px; background: #ddd; width: 100%; text-align: center; } </style></head><body> <div class=”main”> <header class=”main_1″>我是头部</header> <section class=”main_1″> <div class=”content”> <div>11111111111</div> </div> </section class=”main_1″> <footer>我是底部</footer> </div></body>2、如果是使用ionic框架，用其自带组件 <ion-fab></ion-fab>
