jquery背景跟随鼠标滑动导航

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。