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慕课网的一个小课程，练习了一遍，不足之处，欢迎指正（照片在本地，大家可以着重看代码哈）：
<!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 "menu">
<li><a class="current" href="#item1" rel="external nofollow" >1F 男装</a></li>
<li><a href="#item2" rel="external nofollow" >2F 女装</a></li>
<li><a href="#item3" rel="external nofollow" >3F 美妆</a></li>
<li><a href="#item4" rel="external nofollow" >4F 数码</a></li>
<li><a href="#item5" rel="external nofollow" >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="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="/UploadFiles/2021-04-02/1F.jpg">
下面再看下JS代码实现：
<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 - 200) {
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>
以上实例代码是小编给大家分享的JQuery和原生JavaScript实现网页定位导航特效，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的，在此也非常感谢大家对脚本之间网站的支持！
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免责声明：本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除！
富贵资源网 Design By www.hznty.com
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