一侧具有鼠标跟随效果的垂直导航菜单
分类：实例代码
本章节分享一段代码实例，它实现了垂直导航菜单效果。
当鼠标悬浮于导航栏目的时候，在左侧会有动画方式跟随的竖条，这也是常见的特效。
代码实例如下:
<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.pipipi.net/" />
<title>前端教程网</title>
<style>
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;
}
a {
color: #333;
text-decoration: none;
}
</style>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.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;
//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
line.height(verNavFirst.outerHeight() - 1).width(verNavFirst.outerWidth());
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>
</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">前端专区</a>
<ul>
<li><a href="#">div教程</a></li>
<li><a href="#">css教程</a></li>
<li><a href="#">js教程</a></li>
</ul>
</li>
<li><a href="#" class="one">前端教程网一</a></li>
<li><a href="#" class="one">前端教程网二</a></li>
<li><a href="#" class="one">前端教程网三</a></li>
</ul>
</div>
</div>
</body>
</html>