请教_html/css_WEB-ITnose
html 图片
请教一下，在极客公园上看到它的回到顶部的功能做的挺好的，想模仿一下，可是它的图片如下，并不是分开的，请问这是怎么弄的，很想知道。好像很多网站都是把许多小图片弄成一张大图片，但是又可以分开使用。请教原因和实现。回复讨论(解决方案)
去网上 看看资料 叫做 css精灵 就是对一张有多个图片的背景图片 定位技术
图片作为背景来引用的。background 的属性里面 有定位的。
background:url(###.jpg) no-repeat left top; 类似于这里的 left top 就是定位的。意思是以这张图片的 左上来定位， 同理 你可以换成数字 。只要控制好位置 就可以 把整个网站的所有背景图片都合并一整张大图。很多大网站 特别是 有换肤功能的就是利用这种办法。
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