最近在学些web前段的知识，看见博客园首页左侧的一个级联菜单，就想写一个demo.呵呵
<!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 runat="server">
<title></title>
<style type="text/css">
*
{
padding: 0px;
margin: 0px;
}
.dis_none
{
display: none;
}
.dis_block
{
display: block;
}
.subSheet
{
position: absolute;
left: 100px;
z-index: 10;
width: 100px;
}
ul
{
list-style: none;
}
li
{
border: 1px solid blue;
width: 100px;
background-color: Gray;
}
li a
{
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<ul>
<li onmousemove="mouse_over(1010)" onmouseout="mouse_out(1010)"><a href="">.NET精华区</a>
<div class="subSheet dis_none" id="1010">
<ul>
<li><a href="">新手入门</a></li>
<li><a href="">托管代码</a></li>
<li><a href="">非托管代码</a></li>
</ul>
</div>
</li>
<li onmousemove="mouse_over(1011)" onmouseout="mouse_out(1011)"><a href="">嵌入式</a>
<div class="subSheet dis_none" id="1011">
<ul>
<li><a href="">新手入门</a></li>
<li><a href="">嵌入式入门</a></li>
<li><a href="">嵌入式进阶</a></li>
</ul>
</div>
</li>
<li onmousemove="mouse_over(1012)" onmouseout="mouse_out(1012)"><a href="">单片机</a>
<div class="subSheet dis_none" id="1012">
<ul>
<li><a href="">新手入门</a></li>
<li><a href="">单片机入门</a></li>
<li><a href="">单片机进阶</a></li>
</ul>
</div>
</li>
<li><a href="">软件测试</a></li>
</ul>
</div>
</form>
</body>
</html>
<script src="Scripts/jquery-1.6.3.js" type="text/javascript"></script>
<script type="text/javascript">
function mouse_over(i) {
$("#" + i).removeClass("dis_none");
}
function mouse_out(i) {
$("#" + i).addClass("dis_none");
}
</script>