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/网页定位导航特效

1：感觉滚动条焦点没有变颜色，哪里不对啊？ console.log(top)怎么打不出来啊

焦点没有跟着内容而变化，到底哪里不对呢，js部分不行，css 的有效果<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
     $(window).scroll(function () {
             var items = $("#content").find(".item"); //先根据#content再去查找.item 提高效率
                var menu = $("#menu");
                var top = $(document).scrollTop();
                //console.log(top);
                var currentId = ""; //滚动条现在所在位置的item id
                items.each(function () {
                    var m = $(this);
                    //注意：m.offset().top代表每一个item的顶部位置
                    if (top > m.offset().top - 300) {
                        currentId = "#" + m.attr("id");
                    } else {
                        return false;
                    }
        });
   var currentLink = menu.find(".current");
     if (currentId && currentLink.attr("href") != currentId) {
         currentLink.removeClass("current");
                    menu.find("[href=" + currentId + "]").addClass("current");
                }
            });
        });

慕仙5237505

2017-11-16

源自：网页定位导航特效  4-5

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3 回答

慕仙5237505 提问者
2017-11-17

改了，可是还是右侧焦点定位滚动条滚动还是没有反应
<!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;
            left:50%;
            top:100px;
            margin-left:370px;
        }

        #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>
 $(document).ready(function(){
        $(window).scroll(function(){
            var top = $(document).scrollTop();
            var menu = $("#menu");
            var items = $("#content").find(".item");
            var currentId = "";
           items.each(function(){
               var t = $(this);
               var ttop = t.offset().top;
               if(top > ttop-300){
                   currentId = "#" + t.attr("id");
               }else{
                   return false;
               }
           });
           
            var currentLink = menu.find(".current");
           if(currentId && currentId.attr("href")!=currentId){
               currentLink.removeClass(".current");
               menu.find('[href='+currentId+']').addClass("current");
           }
        });
    });
       //滚动条发生滚动时，要获取相应的值。
           
            //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>

0 回复 有任何疑惑可以回复我~
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qq_傻爱_0
2017-11-17

 if (top > m.offset().top - 300) {
                        currentId = "#" + m.attr("id");
                    } else {
                        return false;
                    }

这句判断方式不对，如果这样写的话在你的理论上是没有什么问题的，但电脑会把 m.offset().top里的点解析成特殊符号，所以说没发生变化，你应该先赋值  m.offset().top   把这个先提出来赋值  var mTop=m.offset().top ;  然后把这个赋的值 mTop ；放进去就行了。

 if (top > mTop - 300) {
                        currentId = "#" + m.attr("id");
                    } else {
                        return false;
                    }

0 回复 有任何疑惑可以回复我~
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#1

慕仙5237505 提问者

改了， 可是还是右侧焦点定位，滚动条滚动时还停留在1f还是没有反应
2017-11-17 回复 有任何疑惑可以回复我~

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网页定位导航特效
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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

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