<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>讓我們共同推廣WEB標準在中國的發展</title><style type="text/css"><!--ul#menu { width:300px; height:300px; margin:0px auto; padding:0px; overflow:hidden; background:transparent url(http://www.alixixi.com/UploadPic/2007-7/200777165515191.jpg)}ul#menu li { list-style-type:none; float:left; width:100px; height:100px;}ul#menu li a { display:block; width:100px; height:100px; text-decoration:none; background:transparent url(http://www.alixixi.com/UploadPic/2007-7/200777165516917.jpg) no-repeat 500px 500px;}a#item1:hover {background-position: 0 0; }a#item2:hover {background-position: -100px 0;}a#item3:hover {background-position: -200px 0;}a#item4:hover {background-position: 0 -100px;}a#item5:hover {background-position: -100px -100px;}a#item6:hover {background-position: -200px -100px;}a#item7:hover {background-position: 0 -200px;}a#item8:hover {background-position: -100px -200px;}a#item9:hover {background-position: -200px -200px;}--></style></head><body><ul id="menu"><li><a id="item1" href="#" title="Item 1"> </a></li><li><a id="item2" href="#" title="Item 2"> </a></li><li><a id="item3" href="#" title="Item 3"> </a></li><li><a id="item4" href="#" title="Item 4"> </a></li><li><a id="item5" href="#" title="Item 5"> </a></li><li><a id="item6" href="#" title="Item 6"> </a></li><li><a id="item7" href="#" title="Item 7"> </a></li><li><a id="item8" href="#" title="Item 8"> </a></li><li><a id="item9" href="#" title="Item 9"> </a></li></ul></body></html>
[Ctrl+A 全部選擇 提示：你可先修改部分代碼，再按運行]
代碼:
<style>
ul { width:300px; height:300px; margin:0px auto; padding:0px; overflow:hidden; background:transparent url(image/menu_gray.jpg)}
li {list-style-type:none; width:100px; height:100px; float:left}
li a { display:block; width:100px; height:100px; text-decoration:none;
background:transparent url(image/menu_color.jpg) no-repeat 500px 500px; }
a#item1:hover {background-position: 0 0; }
a#item2:hover {background-position: -100px 0;}
a#item3:hover {background-position: -200px 0;}
a#item4:hover {background-position: 0 -100px;}
a#item5:hover {background-position: -100px -100px;}
a#item6:hover {background-position: -200px -100px;}
a#item7:hover {background-position: 0 -200px;}
a#item8:hover {background-position: -100px -200px;}
a#item9:hover {background-position: -200px -200px;}
</style>
<ul>
<li><a id="item1" href="#" title="Item 1"> </a></li>
<li><a id="item2" href="#" title="Item 2"> </a></li>
<li><a id="item3" href="#" title="Item 3"> </a></li>
<li><a id="item4" href="#" title="Item 4"> </a></li>
<li><a id="item5" href="#" title="Item 5"> </a></li>
<li><a id="item6" href="#" title="Item 6"> </a></li>
<li><a id="item7" href="#" title="Item 7"> </a></li>
<li><a id="item8" href="#" title="Item 8"> </a></li>
<li><a id="item9" href="#" title="Item 9"> </a></li>
</ul>
是不是非常簡單，而我們所用到的圖片也僅僅是下面的2張而已:
現在我們來分析 background-position 的用法：
A元素一開始的時候背景位置設定成 background-position:500px 500px，而它的大小僅只有100px*100px而已，所以A標籤下的所有背景都超過了可視範圍無法顯示，我們一開始看見的黑白照片就是UL的背景圖象。接著當滑鼠移動到A元素上的時候，再根據每個A元素所處的位置來分別為他們設定背景的移動大小，這樣就形成上面的黑白圖片交替效果。
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