1 .bg{
2 width:100%;
3 height:100%;
4 background-image: url(../image/splash.png);
5 background-size: 100% 100%;
6 background-size: cover;
7 position: fixed; ----重点
8 display: block;
9 }
原文：http://www.cnblogs.com/kangshuai/p/5090931.html