自动固定顶部的悬浮菜单栏代码

来源：互联网发布：小米6数据网络不稳定编辑：程序博客网时间：2024/05/17 00:03

View Code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>自动固定顶部的悬浮菜单栏代码</title><meta http-equiv="content-type" content="text/html;charset=gb2312"><style type="text/css">*{margin:0;padding:0;}ul,li{list-style:none;}#content{width:600px;margin:0 auto;border:1px solid #f00;}ul li.item{width:400px;text-align:center;margin:20px 100px;background:#00f;color:#fff;font-size:14px;font-weight:bold;height:100px;line-height:100px;}#float_banner{position:absolute;top:0;left:50%;width:900px;margin-left:-450px;height:30px;line-height:30px;text-align:center;background:#000;color:#fff;font-size:14px;font-weight:bold;z-index:2;}</style></head><body><div id="float_banner">这里是顶部的横幅，随着页面滚动而浮动</div>    <ul id="content">    <li class="item">第一块内容</li>    <li class="item">第二块内容</li>    <li class="item">第三块内容</li>    <li class="item">第四块内容</li>    <li class="item">第五块内容</li>    <li class="item">第六块内容</li>    <li class="item">第七块内容</li>    <li class="item">第八块内容</li>    <li class="item">第九块内容</li>    <li class="item">第十块内容</li></ul><script language="javascript">var speed = 100;var scrollTop = null;var hold = 0;var float_banner;var pos = null;var timer = null;var moveHeight = null;float_banner = document.getElementById("float_banner");window.onscroll=scroll_ad;function scroll_ad(){    scrollTop = document.documentElement.scrollTop+document.body.scrollTop;    pos = scrollTop - float_banner.offsetTop;    pos = pos/10    moveHeight = pos>0?Math.ceil(pos):Math.floor(pos);    if(moveHeight!=0){        float_banner.style.top = float_banner.offsetTop+moveHeight+"px";        setTimeout(scroll_ad,speed);    }//alert(scrollTop);}</script></body></html>

eg2:

View Code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>顶部固定菜单</title> <style type="text/css"> *{ margin:0; padding:0;} .nav-wrapper-fixed{ position:fixed; top:0; width:100%;} .nav-wrapper-fixed .nav{width:960px; margin:0 auto;} .nav-wrapper-fixed .nav li{ float:left; width:100px; margin-right:5px; background:#CCC; text-align:center; height:24px; line-height:24px; list-style:none;} .nav-wrapper{ margin-top:100px; width:100%;} .nav-wrapper .nav{width:960px; margin:0 auto;} .nav-wrapper .nav li{ float:left; width:100px; margin-right:5px; background:#CCC; text-align:center; height:24px; line-height:24px; list-style:none;} </style> <script type="text/javascript">     window.onload = function () {         var nav = document.getElementById('nav');         var navFixed = document.getElementById('navFixed');         window.onscroll = function () {             var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;             document.title = scrollTop             if (scrollTop > nav.offsetTop) {                 navFixed.style.display = 'block';             } else if (scrollTop < nav.offsetTop) {                 navFixed.style.display = 'none';             }         }     }; </script> </head> <body style="height:2000px;"> <div class="nav-wrapper">     <div class="nav" id="nav">         <ul>             <li>菜单一</li>             <li>菜单二</li>             <li>菜单三</li>             <li>菜单四</li>             <li>菜单五</li>         </ul>     </div> </div> <div class="nav-wrapper-fixed" id="navFixed" style="display:none;">     <div class="nav" id="nav">         <ul>             <li>菜单一</li>             <li>菜单二</li>             <li>菜单三</li>             <li>菜单四</li>             <li>菜单五</li>         </ul>     </div> </div> </body> </html>

eg3:

View Code

  $(function () {        var elm = $('#pordAttr');        var startPos = $(elm).offset().top;        $.event.add(window, "scroll", function () {            var p = $(window).scrollTop();            $(elm).css('position', ((p) > startPos) ? 'fixed' : 'static');            $(elm).css('top', ((p) > startPos) ? '0px' : "");        });    });

获取元素（这里定位元素A）距离顶部的高度，接着设定scroll滚动的事件，比如超过那个高度，把A的位置设定为fixed，小于该高度，修改回relative。