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/JavaScript

/网页定位导航特效

我找了很久，都不知道哪里出错了。firebug也没有报错，请问出现这样的错误要如何调试？

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8"/>

<title>地狗购物网——网页定位导航效果</title>

<style>

        * {

            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: 16px;

            font-weight: bold;

            border-bottom: 2px solid #0088bb;

            margin-bottom: 10px;

        }


        #content .item li {

            display: inline;

            margin-right: 10px;

        }


        #content .item li a img {

            width: 230px;

            height: 230px;

            border: none;

        }


       

/*请补充此处代码，让导航菜单在右侧绝对定位显示*/

        #menu{

            position:fixed; 

            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;

        }


        #menu ul li a:hover,

        #menu ul li a.current {

            color: #fff;

            background: #0088bb;

        }


        /*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>

<script src="http://libs.baidu.com/jquery/1.10.2/jquery.js"></script>

<script>

function getByClass(obj,cla){

var elements=obj.getElementsByTagName('*');

var result=[];

for(var i=0;i<elements.length;i++){

if(elements[i].className==cla){

result.push(elements[i]);

}

}

return result;

}

       

            //滚动条发生滚动时，要获取相应的值。

window.onload=function(){

window.onscroll=function(){

var Lis=document.getElementById('menu').getElementsByTagName('a');

var items=getByClass(document.getElementById('content'),'item');

var top=document.documentElement?document.documentElement.scrollTop:document.body.scrollTop;

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){

for(var j=0;j<Lis.length;j++){

var _Lis=Lis[j];

var _href=_Lis.href.split("#");

if(_href[_href.length-1]!=currentId){

_Lis.removeClass="current";

} else{

_Lis.addClass='current';

}

}

}

}

}

           

            //请补充此处代码，让导航菜单实现在滚动条滚动的时候自动设置焦点



            //给相应楼层的a 设置 current，取消其他链接的current

                

</script>

</head>

<body>

<div id="menu">

<ul>

<!--运用锚点，实现导航定位。-->



<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>

<div id="content">

<h1>地狗购物网</h1>


<div id="item1" class="item">

<h2>1F 男装</h2>

<ul>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>

</ul>

</div>

<div id="item2" class="item">

<h2>2F 女装</h2>

<ul>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>

</ul>

</div>

<div id="item3" class="item">

<h2>3F 美妆</h2>

<ul>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>

</ul>

</div>

<div id="item4" class="item">

<h2>4F 数码</h2>

<ul>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>

</ul>

</div>

<div id="item5" class="item">

<h2>5F 母婴</h2>

<ul>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610cd0001f34603990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610cd0001f34603990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610cd0001f34603990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610cd0001f34603990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610cd0001f34603990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610cd0001f34603990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610cd0001f34603990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610cd0001f34603990422.jpg" alt=""/></a></li>

<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610cd0001f34603990422.jpg" alt=""/></a></li>

</ul>

</div>

</div>

</body>

</html>


慕粉18813290620

2016-08-09

源自：网页定位导航特效  6-4

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2 回答

铃铛3
2016-08-15

把class的添加移除方法改下就可以了，你用的是JQ的方法，JS的没有这个用法

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>地狗购物网——网页定位导航效果</title>
<style>
        * {
            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: 16px;
            font-weight: bold;
            border-bottom: 2px solid #0088bb;
            margin-bottom: 10px;
        }

        #content .item li {
            display: inline;
            margin-right: 10px;
        }

        #content .item li a img {
            width: 230px;
            height: 230px;
            border: none;
        }

       
/*请补充此处代码，让导航菜单在右侧绝对定位显示*/
        #menu{
            position:fixed; 
            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;
        }

        #menu ul li a:hover,
        #menu ul li a.current {
            color: #fff;
            background: #0088bb;
        }

        /*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>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.js"></script>
<script>
    function getByClass(obj,cla){
        var elements=obj.getElementsByTagName('*');
        var result=[];
        for(var i=0;i<elements.length;i++){
            if(elements[i].className==cla){
                result.push(elements[i]);
            }
        }
            return result;
    }
       
            //滚动条发生滚动时，要获取相应的值。
    window.onload=function(){
    window.onscroll=function(){
        var Lis=document.getElementById('menu').getElementsByTagName('a');
        var items=getByClass(document.getElementById('content'),'item');
        var top=document.documentElement.scrollTop ? document.documentElement            .scrollTop : document.body.scrollTop;
        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){
    for(var j=0;j<Lis.length;j++){
    var _Lis=Lis[j];
    var _href=_Lis.href.split("#");
    if(_href[_href.length-1]!=currentId){
        _Lis.className = " ";
    }else{
        _Lis.className ='current';
            }
         }
        }
    }
}
           
            //请补充此处代码，让导航菜单实现在滚动条滚动的时候自动设置焦点


            //给相应楼层的a 设置 current，取消其他链接的current
                
</script>
</head>
<body>
<div id="menu">
<ul>
<!--运用锚点，实现导航定位。-->


<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>
<div id="content">
<h1>地狗购物网</h1>

<div id="item1" class="item">
<h2>1F 男装</h2>
<ul>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//53660fce0001111903990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item2" class="item">
<h2>2F 女装</h2>
<ul>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//5366104c0001e5c403990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item3" class="item">
<h2>3F 美妆</h2>
<ul>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610820001cf5b03990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item4" class="item">
<h2>4F 数码</h2>
<ul>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img1.sycdn.imooc.com//536610ac00012df703990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item5" class="item">
<h2>5F 母婴</h2>
<ul>
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#1

铃铛3

忘写了个，再把var top=document.documentElement ? document.documentElement .scrollTop : document.body.scrollTop;改成var top=document.documentElement.scrollTop ? document.documentElement .scrollTop : document.body.scrollTop;
2016-08-15 回复 有任何疑惑可以回复我~
__Timer
2016-08-10

top获取不正确

var top=document.documentElement.scrollTop||document.body.scrollTop;

试一下！

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#1

慕粉18813290620 提问者

top这样获取也是可以的
2016-08-12 回复 有任何疑惑可以回复我~

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