js+css实现导航效果实例
发布于 2017-06-23 03:05:03 | 152 次阅读 | 评论: 0 | 来源: 网友投递
这里有新鲜出炉的Javascript教程，程序狗速度看过来！
JavaScript客户端脚本语言
Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言，主要目的是为了解决服务器端语言，比如Perl，遗留的速度问题，为客户提供更流畅的浏览效果。
这篇文章主要介绍了js+css实现导航效果,实例分析了下拉菜单导航的js实现方法,非常具有实用价值,需要的朋友可以参考下
本文实例讲述了js+css实现导航效果的方法。分享给大家供大家参考。具体实现方法如下：
1. 程序代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>CSS+JS实现兼容性很好的无限级下拉菜单</title>
<style type="text/css">
*{ margin:0; padding:0; border:0;}
body{font:12px/130% verdana,geneva,arial,helvetica,sans-serif,宋体;}li{list-style:none;}
.clearfix:after{content:" ";display:block;height:0;clear:both;visibility:hidden;}.clearfix{display:inline-block;}
a:link{ color:#000; text-decoration:none; }
a:visited{ color:#000; text-decoration:none; }
a:hover{ color:#000; text-decoration:none; }
.menu{ width:778px; height:26px; background:#fff; margin:0 auto;}
.menusel{ float:left;width:100px; position:relative; height:25px; background:#ddd; line-height: 25px; margin-left: 1px; *margin-left: 0px;_margin-left: -1px;}
.menusel h2{ font-size:12px; }
.menusel a{ display: block;text-align:center; width:100px;border:1px solid #a4a4a4; height:25px; border-bottom:1px solid #a4a4a4; position:relative; z-index:2;}
.menusel a:hover{ border:1px solid #a4a4a4; border-bottom:1px dashed #eeeeee; position:relative; z-index:2; height:25px;}
.ahover a{border-bottom:1px dashed #eeeeee; background:#eeeeee; }
.position{ position:absolute; z-index:1;}
.menusel ul{width:125px; background:#eee; border:1px solid #a4a4a4; margin-top: -1px; position:relative; z-index:1; display:none;}
.menusel .block{ display:block;}
.typeul li{border-bottom:1px dashed #a4a4a4;width:125px; position:relative; float:left; }
.typeul li a{ border:none;width:125px; }
.typeul li a:hover{ border:none; background:#ddd;}
.typeul{ margin-left:0; }
.typeul ul{left:125px; top:0; position:absolute;}
.fli{ margin-left: -1px; border-left:#eeeeee solid 1px;}
.menusel .lli{ border:none; }
</style>
<script type="text/javascript">document.execCommand("BackgroundImageCache", false, true);</script><!-- IE6背景图片闪烁问题 -->
</head>
<body>
<div class="menu">
<div id="menu1" class="menusel">
<h2><a href="/">菜单1</a></h2>
<div class="position">
<ul class="clearfix typeul">
<li><a href="http://www.phperz.com">菜单选项1-2</a></li>
<li>
<a href="#">菜单选项1-2</a>
<ul>
<li class="fli"><a href="#">菜单选项1-2-1</a></li>
<li class="lli"><a href="#">菜单选项1-2-2</a></li>
</ul>
</li>
<li><a href="http://www.phperz.com">菜单选项1-2</a></li>
<li class="lli"><a href="#">菜单选项1-2</a></li>
</ul>
</div><!-- position -->
</div><!-- menusel -->
<div id="menu2" class="menusel">
<h2><a href="#">菜单2</a></h2>
<div class="position">
<ul class="clearfix typeul">
<li><a href="#">菜单选项2-2</a></li>
<li><a href="#">菜单选项2-2</a>
<ul>
<li class="fli"><a href="#">菜单选项2-2-1</a></li>
<li class="lli"><a href="#">菜单选项2-2-2</a>
<ul>
<li class="fli"><a href="#">菜单选项2-2-1</a></li>
<li class="lli"><a href="#">菜单选项2-2-2</a>
</li>
</ul>
</li>
</ul>
</li>
<li><a href="#">菜单选项2-2</a></li>
<li class="lli"><a href="#">菜单选项2-2</a></li>
</ul>
</div><!-- position -->
</div><!-- menusel -->
<div id="menu3" class="menusel">
<h2><a href="#">菜单3</a></h2>
<div class="position">
<ul class="clearfix typeul">
<li><a href="#">菜单选项3-2</a></li>
<li><a href="#">菜单选项3-2</a>
<ul>
<li class="fli"><a href="#">菜单选项3-2-1</a></li>
<li class="lli"><a href="#">菜单选项3-2-2</a>
<ul>
<li class="fli"><a href="#">菜单选项3-2-1</a></li>
<li class="lli"><a href="#">菜单选项3-2-2</a>
<ul>
<li class="fli"><a href="#">菜单选项3-2-1</a></li>
<li class="lli"><a href="#">菜单选项3-2-2</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><a href="#">菜单选项3-2</a></li>
<li class="lli"><a href="#">菜单选项3-2</a></li>
</ul>
</div><!-- position -->
</div><!-- menusel -->
</div><!-- menu -->
<script type="text/javascript">
for(var x = 1; x < 4; x++)
{
var menuid = document.getElementById("menu"+x);
menuid.num = x;
type();
}
function type()
{
var menuh2 = menuid.getElementsByTagName("h2");
var menuul = menuid.getElementsByTagName("ul");
var menuli = menuul[0].getElementsByTagName("li");
menuh2[0].onmouseover = show;
menuh2[0].onmouseout = unshow;
menuul[0].onmouseover = show;
menuul[0].onmouseout = unshow;
function show()
{
menuul[0].className = "clearfix typeul block"
}
function unshow()
{
menuul[0].className = "typeul"
}
for(var i = 0; i < menuli.length; i++)
{
menuli[i].num = i;
var liul = menuli[i].getElementsByTagName("ul")[0];
if(liul)
{
typeshow()
}
}
function typeshow()
{
menuli[i].onmouseover = showul;
menuli[i].onmouseout = unshowul;
}
function showul()
{
menuli[this.num].getElementsByTagName("ul")[0].className = "block";
}
function unshowul()
{
menuli[this.num].getElementsByTagName("ul")[0].className = "";
}
}
</script>
</body>
</html>2. 程序效果
希望本文所述对大家的javascript程序设计有所帮助。
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