点’2楼‘，‘1楼’导航高亮。点‘3楼’，‘2楼’导航高亮。为啥呢？
来源：4-5 编程练习
举个栗子233
2015-09-09 21:51
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>地狗购物网——网页定位导航效果</title>
<style>
* {
margin: 0;
padding: 0;
}
body {
font-size: 12px;
line-height: 1.7;
}
li {
list-style: none;
}
#content {
width: 800px;
margin: 0 auto;
padding: 20px;
}
#content h1 {
color: #0088bb;
}
#content .item {
padding: 20px;
margin-bottom: 20px;
border: 1px dotted #0088bb;
}
#content .item h2 {
font-size: 16px;
font-weight: bold;
border-bottom: 2px solid #0088bb;
margin-bottom: 10px;
}
#content .item li {
display: inline;
margin-right: 10px;
}
#content .item li a img {
width: 230px;
height: 230px;
border: none;
}
/*请补充此处代码，让导航菜单在右侧绝对定位显示*/
#menu {
position :fixed;
top:100px;
left:50%;
margin-left:400px;
width:80px;
}
#menu ul li a {
display: block;
margin: 5px 0;
font-size: 14px;
font-weight: bold;
color: #333;
width: 80px;
height: 50px;
line-height: 50px;
text-decoration: none;
text-align: center;
}
#menu ul li a:hover,
#menu ul li a.current {
color: #fff;
background: #0088bb;
}
/*ie6 hack*/
* html, * html body {
background-image: url(about:blank);
background-attachment: fixed;
}
* html #menu {
/*position: fixed;*/
position: absolute;
top: expression(((e=document.documentElement.scrollTop)?e:document.body.scrollTop)+100+'px');
}
</style>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.js"></script>
<script>
$(function(){
//滚动条发生滚动时，要获取相应的值。
$(window).scroll(function(){
//请补充此处代码，让导航菜单实现在滚动条滚动的时候自动设置焦点
var top = $(document).scrollTop(); //var menuTop = $menu.scrollTop(); <--错误的 $(document)为获取整个文档，发现，在该例子下‘document’等同于‘this’
var $menu = $("#menu");
var items = $("#content").find(".item"); //比$("#content .item");效率高
var menuTop = ""; //导航的相对位移
var floor="";
items.each(function(){
menuTop = $(this).offset().top;//item.offset();-->错误的 offset：获取元素的top与left
if(top>menuTop)
{
floor = "#"+$(this).attr("id");
}else{
return false;
}
});
//给相应楼层的a 设置 current，取消其他链接的current
var currentLink = $("#menu").find(".current");
if(floor && currentLink.attr("href")!=floor)
{
currentLink.removeClass("current");
$menu.find("[href="+floor+"]").addClass("current");//$("menu").find("[href="+floor+"]").addClass("current");
}
});
});
</script>
</head>
<body>
<div id="menu">
<ul>
<!--运用锚点，实现导航定位。-->
<li><a href="#item1" class="current">1F 男装</a></li>
<li><a href="#item2">2F 女装</a></li>
<li><a href="#item3">3F 美妆</a></li>
<li><a href="#item4">4F 数码</a></li>
<li><a href="#item5">5F 母婴</a></li>
</ul>
</div>
<div id="content">
<h1>地狗购物网</h1>
<div id="item1" class="item">
<h2>1F 男装</h2>
<ul>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item2" class="item">
<h2>2F 女装</h2>
<ul>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item3" class="item">
<h2>3F 美妆</h2>
<ul>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item4" class="item">
<h2>4F 数码</h2>
<ul>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item5" class="item">
<h2>5F 母婴</h2>
<ul>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
</ul>
</div>
</div>
</body>
</html>
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- 举个栗子233
- 2015-09-10 16:40:18
找到原因了：
if(top>menuTop) { floor = "#"+$(this).attr("id"); }else{ return false; }if（）括号内应该改为（top>menuTop-200）
网页定位导航特效
本课程讲解网页定位导航特效，仿天猫版地狗购物网，你值得拥有
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