滚动没有效果，而且也没有显示错误，麻烦大神帮帮忙指出（已解决）
来源：6-3 使用JS实现函数
小白亭
2017-08-08 21:31
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>枫林购物网-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: #08b;
}
#content .item{
padding: 20px;
margin-bottom: 20px;/*楼层间有距离*/
border: 1px solid #08b;
}
#content .item h2{
font-size: 16px;
font-weight: bold;
border-bottom: 2px solid #08b;
margin-bottom: 10px;
}
#content .item li {
display: inline;
margin-right: 10px;/*图片间有距离*/
}
#content .item li a img {
width: 230px;
height: 230px;
border: none;
}
#menu{
position: fixed;
top: 100px;
left: 50%;
margin-left: 400px;/*先居中再设外边距*/
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-color: #08b;
}
/*hack*/
*html, *html body{
background-image:url(about:blank);
background-attachment:fixed;
}
*html #menu{
position: fixed;
position: absolute;
top: expression(((e=documentElement.scrollTop)?e:document.body.scrollTop)+100+'px');
}
</style>
<script>
//根据class name获取元素
function getElementsByClassName(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;
}
function hasClass(obj,cls){
return obj.className.match(new RegExp("(\\s|^)" + cls + "(\\s|$)"));
}
function removeClass(obj,cls){
if(hasClass(obj,cls)){
//remove
var reg = new RegExp("(\\s|^)" + clas + "(\\s|$)");
obj.className = obj.className.replace(reg," ");
}
}
function addClass(obj,cls){
if(!hasClass(obj,cls)){
obj.className+=" "+cls;
}
}
window.onload = function(){
window.onscroll = function(){
var top = document.documentElement? document.documentElement.scrollTop : document.body.scrollTop;
var menus = document.getElementById("menu").getElementsByTagName("a");
var items = getElementsByClassName(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;
}
}
if(currentId){
//给正确的menu下的a元素 class属性
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>
</head>
<body>
<div id="menu">
<ul>
<li><a 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>
<div id="content">
<h1>枫林购物网</h2>
<div id="item1">
<h2>1F男装</h2>
<ul>
<li><a href="#"><img src="images/1F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/1F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/1F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/1F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/1F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/1F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/1F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/1F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/1F.jpg" alt="" /></a></li>
</ul>
</div>
<div id="item2">
<h2>12F女装</h2>
<ul>
<li><a href="#"><img src="images/2F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/2F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/2F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/2F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/2F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/2F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/2F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/2F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/2F.jpg" alt="" /></a></li>
</ul>
</div>
<div id="item3">
<h2>3F美妆</h2>
<ul>
<li><a href="#"><img src="images/3F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/3F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/3F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/3F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/3F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/3F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/3F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/3F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/3F.jpg" alt="" /></a></li>
</ul>
</div>
<div id="item4">
<h2>4F数码</h2>
<ul>
<li><a href="#"><img src="images/4F.png" alt="" /></a></li>
<li><a href="#"><img src="images/4F.png" alt="" /></a></li>
<li><a href="#"><img src="images/4F.png" alt="" /></a></li>
<li><a href="#"><img src="images/4F.png" alt="" /></a></li>
<li><a href="#"><img src="images/4F.png" alt="" /></a></li>
<li><a href="#"><img src="images/4F.png" alt="" /></a></li>
<li><a href="#"><img src="images/4F.png" alt="" /></a></li>
<li><a href="#"><img src="images/4F.png" alt="" /></a></li>
<li><a href="#"><img src="images/4F.png" alt="" /></a></li>
</ul>images/
</div>
<div id="item5">
<h2>5F母婴</h2>
<ul>
<li><a href="#"><img src="images/5F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/5F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/5F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/5F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/5F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/5F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/5F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/5F.jpg" alt="" /></a></li>
<li><a href="#"><img src="images/5F.jpg" alt="" /></a></li>
</ul>
</div>
</div>
</body>
</html>
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2回答
-
- 小白亭
- 2017-08-09 19:37:02
问题已解决。
-
- 小白亭
- 2017-08-08 22:43:50
我改了101行的clas（拼写错误），可是还是没有焦点变换的效果...
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
71404 学习 · 486 问题
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