<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>网页定位导航</title>
<script id="jquery_183" type="text/javascript" class="library" src="jquery-1.11.3.js"></script>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
body {
font-size: 12px;
line-height: 1.7;
/*1.7是啥意思*/
}
/*左侧内容*/
li {
list-style: none;
}
#content {
width: 800px;
margin: 0 auto;
}
#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;
/*h是块级元素*/
margin-bottom: 10px;
}
#content .item li {
display: inline;
/*在宽度允许时优先在从左到右按行排*/
margin-right: 10px;
}
#content .item li a img {
width: 230px;
height: 230px;
/*强行设置高宽后，图片会拉伸变形*/
border: none;
}
/*右侧导航*/
#menu {
position: fixed;
/*fixed使得元素在永远固定在可视窗口的指定位置*/
top: 100px;
left: 50%;
margin-left: 400px;
}
#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;
/*是上下居中还是左右居中，还是4个方向居中*/
}
#menu ul li a:hover,
#menu ul li a.current {
/*a.current*/
color: #fff;
background: #0088bb;
}
</style>
</head>
<body>
<!--右侧导航菜单-->
<div id="menu">
<ul>
<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>
<!--左侧内容-->
<div style="text-align:center;font-weight:bold;font-size:18px;">实现了一个右侧的导航栏，可根据页面滚动即时定位(建议全屏查看)</div>
<div id="content">
<h1>Demo购物网</h1>
<div id="item1" class="item">
<h2>1F 男装</h2>
<ul>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/1F.jpg" alt="" /></a>
</li>
<!--alt属性是啥-->
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/1F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/1F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/1F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/1F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/1F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/1F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/1F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/1F.jpg" alt="" /></a>
</li>
</ul>
</div>
<div id="item2" class="item">
<h2>2F 女装</h2>
<ul>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/2F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/2F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/2F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/2F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/2F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/2F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/2F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/2F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/2F.jpg" alt="" /></a>
</li>
</ul>
</div>
<div id="item3" class="item">
<h2>3F 美装</h2>
<ul>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/3F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/3F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/3F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/3F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/3F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/3F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/3F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/3F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/3F.jpg" alt="" /></a>
</li>
</ul>
</div>
<div id="item4" class="item">
<h2>4F 数码</h2>
<ul>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/4F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/4F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/4F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/4F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/4F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/4F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/4F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/4F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/4F.jpg" alt="" /></a>
</li>
</ul>
</div>
<div id="item5" class="item">
<h2>5F 母婴</h2>
<ul>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/5F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/5F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/5F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/5F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/5F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/5F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/5F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/5F.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="http://sandbox.runjs.cn/uploads/rs/269/icmjjofl/5F.jpg" alt="" /></a>
</li>
</ul>
</div>
</div>
<script type="text/javascript">
$(document).ready(function() {
//监听滚动条事件
$(window).scroll(function() { //也可以用:$(window).on('scroll',function(){})
var top = $(document).scrollTop();
var menu = $('#menu');
var items = $('#content').find('.item') //和$('#content .item')以及('#content>.item),$('.item')的区别？先获取id效率高
var currentId = '';
items.each(function() {
var m = $(this);
var itemTop = m.offset().top; //遍历返回了每个item的top
if(top > itemTop - 200) {
currentId = '#' + m.attr('id');
console.log(itemTop);
} else {
return false //滚动条高度<itemn的高度时，跳出循环，后面itemn的高度不会进入遍历，提高了页面效率
}
})
//给相应楼层设置current，并且取消其他的current
//currentLink表示当前的楼层
var currentLink = menu.find('.current');
//判断currentId是否为空，比如滚动条距离小于第一层;第二个条件如果当前currentId和currentlink对应的是同一楼层，就不用再做变更
if(currentId && currentLink.attr('href') != currentId) {
currentLink.removeClass('current');
menu.find('[href=' + currentId + ']').addClass('current');
}
});
})
</script>
</body>
</html>
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