<!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>
<title></title>
<script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
<style type="text/css">
ul{ list-style-type:none}
.head{ background-color:gray; cursor:pointer;}
.body{background-color:Green}
</style>
<script type="text/javascript">
$(function () {
$("li:even").addClass("head").click(function () {
//$(this).next().toggle();
$(this).next().show().siblings(".body").hide();
});
$("ul li:odd").addClass("body");
$("li:first").click();//模拟点击元素
});
</script>
</head>
<body>
<ul>
<li>我的好友</li>
<li>aaa<br />bbb</li>
<li>朋友</li>
<li>aaa</li>
<li>同学</li>
<li>aaa</li>
</ul>
</body>
</html>
