用讲师的方法就可以，我就是照着打下来的··就是没反应，下面注释的是讲师的方法，求大神帮看一下问题所在！叩谢<!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 type="text/javascript"> $(document).ready(function(){ $(window).scroll(function(){ var top = $(document).scrollTop(); var menu = $("menu"); var item = $("#content").find(".item"); var currentId=""; item.each(function(){ var m = $(this); 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"); } console.log(menu.find("[href="+currentId+"]")); }); }); //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 // $(document).ready(function () { // $(window).scroll(function () { // var items = $("#content").find(".item"); // var menu = $("#menu"); // var top = $(document).scrollTop(); // 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"); // } // }); // });</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>
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