js实现滚动定位
直接上代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>爱淘气购物网－JQuery网页定位导航特效</title>
<style>
/*All tag*/
html,
body,
div,
ul,
li,
img,
h1,
h2 {
margin: 0;
padding: 0;
}
ul {
list-style: none;
}
a {
text-decoration: none;
color: #333;
}
/*menu*/
#menu {
position: fixed;
top: 100px;
left: 50%;
margin-left: 400px;
}
#menu>li>a {
display: block;
padding: 10px 15px;
height: 30px;
line-height: 30px;
font-size: 14px;
font-weight: bold;
margin: 5px 0;
}
#menu>li>a:hover,
#menu>li>a.current {
color: #fff;
background-color: #0088bb;
}
/*content*/
#content {
width: 800px;
margin: 30px auto;
}
h1 {
color: #0088bb;
font-size: 30px;
margin-bottom: 10px;
}
.item {
border: 1px dotted #0088bb;
padding: 20px;
margin-bottom: 20px;
}
.item>h2 {
font-size: 16px;
padding-bottom: 5px;
border-bottom: 2px solid #0088bb;
margin-bottom: 10px;
}
.item-list>li {
display: inline-block;
margin-right: 10px;
}
.item-list>li>a>img {
width: 230px;
height: 230px;
border: none;
}
/* 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>
</head>
<body>
<ul id="menu">
<li><a class="current" href="#item1">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 id="content">
<h1>爱淘气购物网</h1>
<div id="item1" class="item">
<h2>1F 男装</h2>
<ul class="item-list">
<li>
<a href="#"><img src="http://p1.qhimgs4.com/dmfd/160_90_/t01a8d3c891c7c3e202.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p1.qhimgs4.com/dmfd/160_90_/t01a8d3c891c7c3e202.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p1.qhimgs4.com/dmfd/160_90_/t01a8d3c891c7c3e202.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p1.qhimgs4.com/dmfd/160_90_/t01a8d3c891c7c3e202.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p1.qhimgs4.com/dmfd/160_90_/t01a8d3c891c7c3e202.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p1.qhimgs4.com/dmfd/160_90_/t01a8d3c891c7c3e202.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p1.qhimgs4.com/dmfd/160_90_/t01a8d3c891c7c3e202.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p1.qhimgs4.com/dmfd/160_90_/t01a8d3c891c7c3e202.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p1.qhimgs4.com/dmfd/160_90_/t01a8d3c891c7c3e202.jpg?size=640x400" alt="商品图片"></a>
</li>
</ul>
</div>
<div id="item2" class="item">
<h2>2F 女装</h2>
<ul class="item-list">
<li>
<a href="#"><img src="http://p2.qhimgs4.com/dmfd/160_90_/t01c5e14034226e1d97.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p2.qhimgs4.com/dmfd/160_90_/t01c5e14034226e1d97.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p2.qhimgs4.com/dmfd/160_90_/t01c5e14034226e1d97.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p2.qhimgs4.com/dmfd/160_90_/t01c5e14034226e1d97.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p2.qhimgs4.com/dmfd/160_90_/t01c5e14034226e1d97.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p2.qhimgs4.com/dmfd/160_90_/t01c5e14034226e1d97.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p2.qhimgs4.com/dmfd/160_90_/t01c5e14034226e1d97.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p2.qhimgs4.com/dmfd/160_90_/t01c5e14034226e1d97.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p2.qhimgs4.com/dmfd/160_90_/t01c5e14034226e1d97.jpg?size=640x400" alt="商品图片"></a>
</li>
</ul>
</div>
<div id="item3" class="item">
<h2>3F 美妆</h2>
<ul class="item-list">
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t017b1f5993c08af904.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t017b1f5993c08af904.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t017b1f5993c08af904.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t017b1f5993c08af904.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t017b1f5993c08af904.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t017b1f5993c08af904.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t017b1f5993c08af904.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t017b1f5993c08af904.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t017b1f5993c08af904.jpg?size=640x400" alt="商品图片"></a>
</li>
</ul>
</div>
<div id="item4" class="item">
<h2>4F 数码</h2>
<ul class="item-list">
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t014922d8477716f299.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t014922d8477716f299.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t014922d8477716f299.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t014922d8477716f299.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t014922d8477716f299.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t014922d8477716f299.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t014922d8477716f299.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t014922d8477716f299.jpg?size=640x400" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p0.qhimgs4.com/dmfd/160_90_/t014922d8477716f299.jpg?size=640x400" alt="商品图片"></a>
</li>
</ul>
</div>
<div id="item5" class="item">
<h2>5F 母婴</h2>
<ul class="item-list">
<li>
<a href="#"><img src="http://p4.qhimg.com/dmfd/160_90_/t0100eb94d000a1b3c9.jpg" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p4.qhimg.com/dmfd/160_90_/t0100eb94d000a1b3c9.jpg" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p4.qhimg.com/dmfd/160_90_/t0100eb94d000a1b3c9.jpg" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p4.qhimg.com/dmfd/160_90_/t0100eb94d000a1b3c9.jpg" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p4.qhimg.com/dmfd/160_90_/t0100eb94d000a1b3c9.jpg" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p4.qhimg.com/dmfd/160_90_/t0100eb94d000a1b3c9.jpg" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p4.qhimg.com/dmfd/160_90_/t0100eb94d000a1b3c9.jpg" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p4.qhimg.com/dmfd/160_90_/t0100eb94d000a1b3c9.jpg" alt="商品图片"></a>
</li>
<li>
<a href="#"><img src="http://p4.qhimg.com/dmfd/160_90_/t0100eb94d000a1b3c9.jpg" alt="商品图片"></a>
</li>
</ul>
</div>
<div style="width: 100%;height: 1000px;"></div>
</div>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script>
//定义getByClassName函数，让函数实现根据className获取对象并返回
function getByClassName(obj, cls) {
var elements = obj.getElementsByTagName("*");
var result = [];
for (var i = 0; i < elements.length; i++) {
if (elements[i].className == cls) {
result.push(elements[i]);
}
}
return result;
}
//定义hasClass函数，确认对象是否包含对应的class
function hasClass(obj, cls) {
return obj.className.match(new RegExp("(\\s|^)" + cls + "(\\s|$)"));
}
//定义removeClass函数，让函数实现删除对象的class
function removeClass(obj, cls) {
if (hasClass(obj, cls)) {
//remove
var reg = new RegExp("(\\s|^)" + cls + "(\\s|$)");
obj.className = obj.className.replace(reg, "");
}
}
//定义addClass函数，让函数实现给对象增加class
function addClass(obj, cls) {
if (!hasClass(obj, cls)) {
obj.className += " " + cls;
}
}
//页面加载完毕执行以下函数
window.onload = function() {
//页面滚动时，执行以下函数
window.onscroll = function() {
var top = document.documentElement.scrollTop || document.body.scrollTop;
var menus = document.getElementById("menu").getElementsByTagName("a");
var items = getByClassName(document.getElementById("content"), "item");
var currentId = "";
for (var i = 0; i < items.length; i++) {
var _item = items[i];
var _itemTop = _item.offsetTop;
if (top > _itemTop) {
currentId = _item.id;
} else {
break;
}
}
//给正确的menu下的a元素class赋值current
if (currentId) {
for (var j = 0; j < menus.length; j++) {
var _menu = menus[j];
var _href = _menu.href.split("#");
if (_href[_href.length - 1] != currentId) {
removeClass(_menu, "current");
} else {
addClass(_menu, "current");
}
}
}
}
}
</script>
</body>
</html>
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