body {
background-attachment: fixed;
background-image: url(http://fj.7cuu.com/myolnet/forum/201311/11/144919nvcqkjdvvikicvcj.jpg);
background-repeat: no-repeat;
background-position: center top;
}
简单吧？只用同个此方法就可以自适应各种窗口了！
转载请注明：七彩悠悠博客 | 心悠悠 情悠悠 » 用css让网页背景图剧中显示
