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/前端开发

/JavaScript

/网页定位导航特效

不行啊，大神们

<!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;

           width:180px;

       }



        


        #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 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;

    }

    

console.log(top);

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|^)" + cls + "(\\s|$)");

obj.className = obj.className.replace(reg, "");

}

}

function addClass(obj,cls){

   if(!hasClass(obj,cls)){

       obj.className += " " +cls;

   }

}

    //定义getByClassName函数，让函数实现给对象增加class 

    

window.onload = function(){ 

   window.onscroll = function(){

   var top = document.documentElement.scrollTop ? 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;

}

}

      //请补充此处代码，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>

</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1906006274

2017-02-07

源自：网页定位导航特效  6-4

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5 回答

慕粉18144024425 回答被采纳 +3 积分
2017-02-07

 错在这行：var elements = obj.getElementsByTagName("*");

("*")，这个星号不能有空格，

http://img1.sycdn.imooc.com//5899e4890001204b07630044.jpg

0 回复 有任何疑惑可以回复我~
收起回答
#1

慕粉1906006274 提问者

你是用webstorm吗?怎么调试。
2017-02-07 回复 有任何疑惑可以回复我~
#2

慕粉1906006274 提问者

为什么星号不能有空格
2017-02-07 回复 有任何疑惑可以回复我~
慕粉18144024425
2017-02-07

var _menu = menus[j]; 还有这个

0 回复 有任何疑惑可以回复我~
收起回答
慕粉18144024425
2017-02-07

你代码很乱，要养成好习惯

0 回复 有任何疑惑可以回复我~
收起回答
#1

慕粉1906006274 提问者

乱在哪？不是这样写吗
2017-02-07 回复 有任何疑惑可以回复我~
#2

慕粉18144024425 回复 慕粉1906006274 提问者

该缩进没有缩进，没有层次感
2017-02-07 回复 有任何疑惑可以回复我~
#3

慕粉1906006274 提问者 回复 慕粉18144024425

怎么设置自动缩进
2017-02-07 回复 有任何疑惑可以回复我~
慕粉18144024425
2017-02-07

<!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;

        }


        #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-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>

    

 //定义getByClassName函数，让函数实现根据class name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;

    }

    

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|^)" + cls + "(\\s|$)");

obj.className = obj.className.replace(reg, "");

}

}

   

    //定义getByClassName函数，让函数实现给对象增加class 

    function addClass(obj, cls){

        if(!hasClass(obj, cls)){

            obj.className += " " + cls;

        }

    }

window.onload = function(){ 

   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;

}

}

      //请补充此处代码，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>

</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//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="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>


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慕少5527016
2017-02-07

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