几个导航栏也算对学过知识的回顾，总有新的收获，下面是学习过程中敲的代码：
<!DOCTYPE HTML>
<html>
<head>
<title></title>
<meta charset="utf-8"/>
<style>
ul{
list-style-type: none;
100px;
}
a{
display: block; /*设为block修改其样式，而不是修改li标签*/
text-decoration:none;
background-color:#ccc;
height: 30px;
line-height: 30px;
100px;
margin-bottom: 1px;
text-indent:20px;
}
li{
}
a:hover{
background-color:#f60;
color:#fff;
}
</style>
</head>
<body>
<ul>
<li><a href='#'>首页</a></li>
<li><a href='#'>新闻</a></li>
<li><a href='#'>咨询</a></li>
<li><a href='#'>服务</a></li>
<li><a href='#'>关于</a></li>
</ul>
</body>
</html> 下面css代码使其水平导航：
ul{
list-style-type: none;
}
a{
display: block;/*设为block修改其样式，而不是修改li标签*/
text-decoration:none;
background-color:#ccc;
height: 30px;
line-height: 30px;
100px;
margin-bottom: 1px;
text-align:center;
}
li{
float:left;
}
a:hover{
background-color:#f60;
color:#fff;
}下面再次改进为伸缩效果：
ul{
list-style-type: none;
height:30px;
border-bottom:3px solid #f60;
margin:0 auto;
800px;
padding-left: 200px;
}
a{
display: block;/*设为block修改其样式，而不是修改li标签*/
text-decoration:none;
background-color:#ccc;
height: 30px;
line-height: 30px;
100px;
margin-bottom: 1px;
text-align:center;
border-radius:10px 10px 0 0;
}
li{
float:left;
100px;
margin: 0 auto;
}
a:hover{
background-color:#f60;
color:#fff;
height:40px;
margin-top:-10px;
line-height: 40px;
}改进后效果如下：
下面用js改进，实现鼠标放上去变宽效果：
<!DOCTYPE HTML>
<html>
<head>
<title></title>
<meta charset="utf-8"/>
<style>
ul{
list-style-type: none;
height:30px;
border-bottom:3px solid #f60;
margin:0 auto;
800px;
padding-left: 200px;
}
a{
display: block;/*设为block修改其样式，而不是修改li标签*/
text-decoration:none;
background-color:#ccc;
height: 30px;
line-height: 30px;
100px;
margin-bottom: 1px;
text-align:center;
border-radius:10px 10px 0 0;
}
li{
float:left;
100px;
margin: 0 auto;
}
a:hover{
background-color:#f60;
color:#fff;
height:40px;
margin-top:-10px;
line-height: 40px;
}
</style>
<script>
window.onload=function(){
var oa=document.getElementsByTagName('a');
for(var i=0;i<oa.length;i++)
{
oa[i].onmouseover=function(){
var that=this;
that.time=setInterval(function(){
that.style.width=that.offsetWidth+8+'px';
if(that.offsetWidth>=120)
{
clearInterval(that.time);
}
},30);
}
oa[i].onmouseout=function(){
var that=this;
that.time=setInterval(function(){
that.style.width=that.offsetWidth-8+'px';
if(that.offsetWidth<=120)
{
that.style=width='120px';
clearInterval(that.time);
}
},30);
}
}
}
</script>
</head>
<body>
<ul>
<li><a href='#'>首页</a></li>
<li><a href='#'>新闻</a></li>
<li><a href='#'>咨询</a></li>
<li><a href='#'>服务</a></li>
<li><a href='#'>关于</a></li>
</ul>
</body>
</html> 效果：
