用SUI开个的webAPP
背景是这样的
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>吃饭宝</title>
<meta name="viewport" content="initial-scale=1, maximum-scale=1">
<link rel="shortcut icon" href="/favicon.ico">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<link rel="stylesheet" href="//g.alicdn.com/msui/sm/0.6.2/css/sm.min.css">
<link rel="stylesheet" href="//g.alicdn.com/msui/sm/0.6.2/css/sm-extend.min.css">
<style>
* {
margin: 0;
padding: 0;
font-size: 20px;
}
.width_100 {
width: 100%;
text-align: center;
}
.o_btn {
width: 100px;
height: 50px;
border: 1px solid #fff;
background: none;
}
#register:active {
background: #ed741f;
border-color: #ed741f;
}
#login:active {
background: #ed741f;
border-color: #ed741f;
}
p {
color: #fff;
}
h1 {
color: #ed741f;
}
.wh {
width: 100%;
height: 100%;
background-image: url(img/cfbbj.jpg);
}
input {
border: 0px;
background: none;
border-bottom: solid 1px;
border-color: white;
}
a {
color: black;
}
</style>
</head>
<body>
<div class="page-group">
<div class="page page-current width_100">
<div class="wh">
<!-- 你的html代码 <-->
<br />
<h1>吃饭包</h1>
<p>餐饮管理系统</p>
<form action="" method="post/get">
<ul>
<li>
<input type="text" name="" id="" value="" placeholder="手机号码" />
</li>
<br />
<li>
<input type="password" name="" id="" value="" placeholder="密码" />
</li>
</ul>
<br />
<br />
<!---->
<a href="html/register.html">
<input id="register" type="button" value="注册" class="o_btn" />
</a>
<a href="javascript:void(0)">
<input id="login" type="button" value="登录" class="o_btn" />
</a>
</form>
<br />
<p>四川新朋网络科技有限公司</p>
<p>SICHUAN NEW FRIENDS NETWORK TECHNOLGY CO., LTD</p>
</div>
</div>
</div>
<script type='text/javascript' src='//g.alicdn.com/sj/lib/zepto/zepto.min.js' charset='utf-8'></script>
<script type='text/javascript' src='//g.alicdn.com/msui/sm/0.6.2/js/sm.min.js' charset='utf-8'></script>
<script type='text/javascript' src='//g.alicdn.com/msui/sm/0.6.2/js/sm-extend.min.js' charset='utf-8'></script>
<script type="text/javascript" src="js/jquery-2.2.1.js"></script>
<script type="text/javascript">
$(document).ready(function() {});
</script>
</body>
</html>background-size:100%;这里写一个100%是横向和纵向都100%，
试试background-size:cover;