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编程练习

运用css和jQuery，实现导航菜单在右侧绝对定位显示，并且可以在滚动时根据滚动条的位置自动设置导航菜单的焦点。

温馨提示 : 完成任务后，请验证是否与实践描述效果一致，如一致，恭喜您，你已经掌握此技能，否则，请重复学习此节内容。

任务

一、静态网页的实现

1.运用CSS，让导航菜单在右侧绝对定位显示。

2.运用锚点，实现导航定位。

提示: 使用position属性。

二、jQuery实现定位导航特效

1.滚动条发生滚动时，要获取相应的值。

提示:先要获取到相应的scrollTop()、导航和当前所在的楼层。

2.实现让导航菜单在滚动条滚动的时候自动设置焦点

提示：这里遍历时需要对滚动条位置和每个元素位置做一个判断，并把相应的元素id值赋予currentId

3. 给相应楼层的 a 设置current，取消其他链接的current

?不会了怎么办

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index.html

<!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 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> //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>  <li><a href="#" class="current">1F 男装</a></li> <li><a href="#">2F 女装</a></li> <li><a href="#">3F 美妆</a></li> <li><a href="#">4F 数码</a></li> <li><a href="#">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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