不知你有没有经历过，看到网页上的一些漂亮的图标，如列表图标，于是把它下载，打开一看，竟然不是我们下载的单个图标，而是一张大图，上面集合着许多小图标！
这里便使用了CSS中一张图片显示多个背景的方法
这些小图标为什么不是分别存储成单独的图标，而是集合放在一张图片上？这样做的目的就是减少http请求次数，节省时间和带宽。
强烈推荐使用这种方法！
当然，实现的方法是有多种，下面将通过一个例子来说一下我常使用的方法。
1、显示完整的图片
如图(1)
代码：
<style type="text/css">
<!--
.bg{
WIDTH: 181px;
HEIGHT: 61px;
}
.bg .logo {
POSITION: relative; WIDTH: 181px; BACKGROUND: url(./logo.gif) 0px 0px; FLOAT: left; HEIGHT: 60px;
}
}
-->
</style>
<body>
<div class="bg">
<div class="logo"></div>
</body>关键代码：
POSITION: relative; WIDTH: xpx; BACKGROUND: url(image) x1px y1px; FLOAT: left; HEIGHT: ypx;
POSITION属性说明：
relative--相对定位
WIDTH--图片显示的宽度
image --背景图片（这里是图片的地址）
x1px--图片水平位置偏移量,起点为(0,0),如取负值将向反方向偏移
y1px---图片竖直位置偏移量
FLOAT--图片浮动方向,如left,right
HEIGHT--图片显示的高度
现在我们将在上面的位置为参照物显示图片不同区域。
1.1、只显示图片中的“W‘
如图(2):
图示显示部分WIDTH: 75px,HEIGHT: 60px,图片水平向左偏移3px.代码：
.bg .logo {
POSITION: relative; WIDTH: 75px; BACKGROUND: url(./logo.gif) -3px 0px; FLOAT: left; HEIGHT: 60px;
}1.2、只显示图片中的一个“B“，如图(3)
图示显示部分WIDTH: 38px,HEIGHT: 60px,图片水平向左偏移78px，竖直向下偏120px,代码：
.bg .logo {
POSITION: relative; WIDTH: 38px; BACKGROUND: url(./logo.gif) -78px 120px; FLOAT: left; HEIGHT: 60px
}
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