jQuery实现滚动自动显示隐藏导航
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了jQuery实现滚动自动显示隐藏导航，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含5049字，纯文字阅读大概需要8分钟。
内容图文
jQuery实现滚动自动显示隐藏导航貌似插件挺多了，Headroom.js、基于bootstrap的jquery.bootstrap-autohidingnavbar.js，jBar.js，但似乎也没必要那么麻烦，或者它们确实有其他优势，目前我还不是很清楚。
本文附件下载地址：http://pan.baidu.com/s/1qW7Vuji
正文
1、首先在你的页面引入jQuery.js包
jquery.min.js文件见附件《jquery.min.js》
<
script
src
="http://www.lanrenzhijia.com/ajaxjs/jquery.min.js"
></
script
>
2、创建导航
<
div
class
="bar"
>
<
ul
class
="text"
>
<
li
>cmdb</li><li>业务监控系统</li><li>运维自动化平台</li><li>智能日志分析</li><li>GM游戏运营管理</li><li>知识管理体系</li></ul></div>
3、给导航添加样式
* {margin:0; padding:0;}
.bar{
width:1000px;
height:30px;
line-height:30px;
position:fixed;
left:50%;
margin-left:-500px;
top:0;
z-index:888;
background:#636871;
}
.text li{
color: white;
float: left;
width: 12%;
}
4、开始js脚本
height是算出当前页面距离顶部的长度，再判断当大于100px时就隐藏class名为bar的div，否则就显示它。fadeIn() 方法使用淡入效果来显示被选元素，假如该元素是隐藏的。fadeOut() 方法使用淡出效果来隐藏被选元素，假如该元素是显示的。
讲解下关于jquery的相关知识：1）$(function(){}是jQuery，当问到载入完毕就执行
2）$(document) 是当前文档，就是你看到的整个网页，$(window) 如果没有框架则就是你浏览的当前浏览器的窗口
<
script
type
="text/javascript"
>
$(
function
(){
$(window).scroll(
function
(){
height
=
$(window).scrollTop();
if
(height
>
100
){
$(
‘
.bar
‘
).fadeIn();
}
else
{
$(
‘
.bar
‘
).fadeOut();
};
});
});
</
script
>
最后贴上整个文件：也可以在附件中的《demo》直接打开
<!
DOCTYPE html
>
<
html
>
<
head
>
<
title
></
title
>
<
meta
charset
="UTF-8"
>
<
link
rel
="stylesheet"
type
="text/css"
href
="css/menu.css"
>
<
script
src
="js/jquery.min.js"
></
script
>
<
script
type
="text/javascript"
>
$(
function
(){
$(window).scroll(
function
(){
height
=
$(window).scrollTop();
if
(height
>
100
){
$(
‘
.bar
‘
).fadeIn();
}
else
{
$(
‘
.bar
‘
).fadeOut();
};
});
});
</
script
>
</
head
>
<
body
>
<
div
class
="bar"
>
<
ul
class
="text"
>
<
li
>cmdb</li><li>业务监控系统</li><li>运维自动化平台</li><li>智能日志分析</li><li>GM游戏运营管理</li><li>知识管理体系</li></ul></div><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/><div>I want to go back to the top.</div><br/></body></html>
原文：http://www.cnblogs.com/abigale/p/4889471.html
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