css background-attachment设置固定的背景图像

编辑代码

<!DOCTYPE html>
<html>
<head>
<style>
body 
{
background-image:url('/images/online_demo/smiley.gif');
background-repeat:no-repeat;
background-attachment:fixed;
height:1600px;
}
</style>
</head>

<body>

</body>

</html>