雪花，是世界上最圣洁的花，当你静静的倾听天籁，尘世的浮躁与喧嚣，似乎都已离你远去，剩下的惟有纯净，那是心灵忘却一切的畅然，那是在没有尘埃的世界里，生命自由呼吸的平淡与安恬。
本文实例为大家分享了js网页定位导航的具体代码，供大家参考，具体内容如下
一个循环判断当前滚动到的位置，另一个循环遍历导航条判断其id是否与滚动到的位置相同
效果如图：
实现代码：
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>地狗购物网--网页定位导航效果</title>
<style type="text/css">
*{
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: 12px;
font-weight: bold;
border-bottom: 2px solid #0088bb;
margin-bottom: 10px;
}
#content .item li{
display: inline;
margin-left:10px ;
}
#content .item li a img{
width: 230px;
height: 230px;
border: none;
}
#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-align: center;
text-decoration: none;
}
#menu ul li a:hover{
color: #fff;
background: #0088bb;
}
#menu ul li .current{
color: #fff;
background: #0088bb;
}
</style>
<script type="text/javascript">
window.onload = function(){
window.onscroll=function(){
var top = document.documentElement.scrollTop || document.body.scrollTop;
var menus = document.getElementById("menu").getElementsByTagName("a");
var items=document.getElementById("content").getElementsByClassName("item");
var currentId="";
for(var i=0;i<items.length;i++){
var _item=items[i];
var _itemTop = _item.offsetTop;
if(top>_itemTop - 200){
currentId=_item.id;
}else{
break;
}
}
if(currentId!=""){
//给正确的menu下的a元素class赋值
for(var j=0;j<menus.length;j++){
var _menu=menus[j];
var _rel="nofollow noopener noreferrer" href=_menu.href.split("#");//因为只通过href获取的链接为一长串链接，需要通过#分成数组
if(_href[_href.length-1]!=currentId){
_menu.className = "";
}else{
_menu.className = " current";
}
}
}
}
}
</script>
</head>
<body>
<div id="menu">
<ul>
<li><a rel="nofollow noopener noreferrer" href="#item1" class="current">1F 男装</a></li>
<li><a rel="nofollow noopener noreferrer" href="#item2">2F 女装</a></li>
<li><a rel="nofollow noopener noreferrer" href="#item3">3F 美妆</a></li>
<li><a rel="nofollow noopener noreferrer" href="#item4">4F 数码</a></li>
<li><a rel="nofollow noopener noreferrer" 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 rel="nofollow noopener noreferrer" href="#"><img src="img/1F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/1F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/1F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/1F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/1F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/1F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/1F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/1F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/1F.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item2" class="item">
<h2>2F 女装</h2>
<ul>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/2F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/2F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/2F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/2F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/2F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/2F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/2F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/2F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/2F.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item3" class="item">
<h2>3F 美妆</h2>
<ul>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/3F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/3F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/3F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/3F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/3F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/3F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/3F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/3F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/3F.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item4" class="item">
<h2>4F 数码</h2>
<ul>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/4F.png" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/4F.png" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/4F.png" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/4F.png" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/4F.png" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/4F.png" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/4F.png" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/4F.png" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/4F.png" alt=""/></a></li>
</ul>
</div>
<div id="item5" class="item">
<h2>5F 母婴</h2>
<ul>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/5F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/5F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/5F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/5F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/5F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/5F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/5F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/5F.jpg" alt=""/></a></li>
<li><a rel="nofollow noopener noreferrer" href="#"><img src="img/5F.jpg" alt=""/></a></li>
</ul>
</div>
</div>
</body>
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
