.mainBox{
width: 100%;
background-color: #EBB02F;
background: url("../images/bg.png") no-repeat;
background-size: 100% 100%;
overflow: hidden
}
.mainBox:after{
content: "";
display: block;
padding-top: 160%;
}
对应 html
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0"/>
<title></title>
<link rel="stylesheet" href="css/group_style.css"/>
<link rel="stylesheet" href="css/index.css"/>
<script type="text/javascript">
function setHeight()
{
var max_height = document.documentElement.clientHeight;
var primary = document.getElementById('mainBox');
primary.style.minHeight = max_height+"px";
primary.style.maxHeight = max_height+"px";
}
</script>
</head >
<body onload="setHeight();" onresize=" setHeight()">
<div class="mainBox" id="mainBox">
</div>
</body>
</html>
