本文实例讲述了支持背景图片上下滑动的竖向jQuery菜单导航特效代码，分享给大家供大家参考。具体如下：
运行效果截图如下：
具体代码如下
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="gb2312">
<title>左边跟随鼠标滑动导航</title>
<meta name="keywords" content="滑动导航" />
<meta name="description" content="左边跟随鼠标滑动导航" />
<style>
/*---------重置---------*/
html {
font-size: 100%;
-webkit-text-size-adjust:100%;
-ms-text-size-adjust:100%;
*overflow:auto;
_overflow-x:hidden;
}
body {
margin:0;
}
p, ul, ol, form, dl, h1, h2, h3, h4, h5, h6 {
margin-top:0;
margin-bottom:0;
}
dl, dd {
margin-left:0;
}
ul, ol {
padding-left:0;
*margin-left:0;
list-style-type: none;
}
ul li {
*zoom:1;
*vertical-align:bottom;
}
em, var, cite, i {
font-style:normal;
}
small {
font-size:inherit;
}
s, a {
text-decoration:none;
}
:focus {
outline:none;
}
blockquote, q {
quotes:none;
margin:0;
}
table {
border-collapse:collapse;
border-spacing:0;
empty-cells:show;/*table-layout:fixed;*/
}
img, iframe {
border:none;
}
img {
vertical-align: top;
-ms-interpolation-mode: bicubic;/*ie7防止图片缩小失真的*/
}
/*---------竖向菜单（非必需）---------*/
.bl-vernav li {
border-bottom:1px solid #ddd;
margin-bottom:-1px;
padding-top:1px;
}
.bl-vernav a {
display:block;
height:20px;
line-height:20px;
padding:10px 16px;
}
.bl-vernav a:hover {
background:#F8F8F8;
text-decoration:none;
}
/*.bl-vernav .cur a{ background:#428BCA; color:#fff;}*/
.bl-vernav-ord {
border:1px solid #ddd;
}
.vernav-level li li {
border-left:none;
border-right:none;
}
.vernav-level li li a {
padding-left:40px;
}
.vernav-level .cur .one {
background:#F8F8F8;
}
.vernav-level li .cur a {
background:#F8F8F8;
}
/*diy*/
.bl-vernav-wrap {
position:relative;
}
.bl-vernav-wrap .sideLine {
position:absolute;
left:-6px;
top:0;
z-index:1;
line-height:0;
font-size:0;
border-left:#FF5F3E solid 7px;
background-color:#F8F8F8;
}
.bl-vernav {
position:relative;
z-index:2;
}
.bl-vernav a:hover {
background-color:transparent;
}
.demobox {
width:460px;
font-size:14px;
color:#333;
font-family:'Hiragino Sans GB', 'Microsoft Yahei', "WenQuanYi Micro Hei", SimSun, Tahoma, Arial, Helvetica, STHeiti;
}
a {
color:#333;
text-decoration:none;
}
</style>
</head>
<body style="padding:50px;">
<div class="demobox">
<h1 class="h3">左边条纹跟随鼠标滑动导航</h1>
<br/>
<div class="bl-vernav-wrap">
<div class="sideLine"></div>
<ul class="bl-vernav vernav-level">
<li><a href="#" class="one">导航菜单</a></li>
<li class="cur"> <a href="#" class="one">神探夏洛克</a>
<ul>
<li><a href="#">海贼王</a></li>
<li><a href="#">海贼王</a></li>
<li><a href="#">海贼王</a></li>
</ul>
</li>
<li><a href="#" class="one">神探夏洛克</a></li>
<li><a href="#" class="one">神探夏洛克</a></li>
<li><a href="#" class="one">神探夏洛克</a></li>
</ul>
</div>
</div>
<script src="http://cdn.bootcss.com/jquery/2.1.4/jquery.min.js"></script>
<script>
$(function(){
var verNav = $(".bl-vernav"), //第一层ul.
line = verNav.siblings(".sideLine"), //左边条纹线
verNavFirst = verNav.children("li:first"), //第一层ul中第一个li
curY = verNav.children("li.cur").position().top;
line.height(verNavFirst.outerHeight()-1).width(verNavFirst.outerWidth());//设置辅助线初始化高度和宽度，也可以直接用css设置好，这里就不用js计算了
verNav.find("li").mouseenter(function(){
var thisY = $(this).position().top;
line.stop(true,true).animate({top:thisY},200);
return false
})
.end()
.mouseleave(function(){
line.stop(true,true).animate({top:curY},300)
}).trigger("mouseleave");
});
</script>
</body>
</html>
希望本文所述对大家学习jquery程序设计有所帮助。