简单的jquery左侧导航栏和页面选中效果

<div class="box">

<ul class="menu">

<li class="level1">

<a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >衬衫</a>

<ul class="level2">

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >短袖衬衫</a></li>

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >长袖衬衫</a></li>

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >短袖T恤</a></li>

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >长袖T恤</a></li>

</ul>

</li>

<li class="level1">

<a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >卫衣</a>

<ul class="level2">

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >开襟卫衣</a></li>

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >套头卫衣</a></li>

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >运动卫衣</a></li>

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >童装卫衣</a></li>

</ul>

</li>

<li class="level1">

<a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >裤子</a>

<ul class="level2">

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >短裤</a></li>

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >休闲裤</a></li>

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >牛仔裤</a></li>

<li><a href="#none" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >免烫卡其裤</a></li>

</ul>

</li>

</ul>

</div>

js代码：

<script type="text/javascript">

//等待dom元素加载完毕.

$(document).ready(function(){

$(".level1 > a").click(function(){

$(this).addClass("current") //给当前元素添加"current"样式

.next().show() //下一个元素显示

.parent().siblings().children("a").removeClass("current") //父元素的兄弟元素的子元素<a>移除"current"样式

.next().hide(); //它们的下一个元素隐藏

return false;

}); 

});

</script>

/* reset */

body{margin:0;padding:0 0 12px 0;font-size:12px;line-height:22px;font-family:"5b8b4f53","Arial Narrow";background:#fff;}

form,ul,li,p,h1,h2,h3,h4,h5,h6{margin:0;padding:0;}

input,select{font-size:12px;line-height:16px;}

img{border:0;}

ul,li{list-style-type:none;}

a {color:#00007F;text-decoration:none;}

a:hover {color:#bd0a01;text-decoration:underline;}



.box {

width: 150px;

margin: 0 auto;

}

.menu{

overflow:hidden;

border-color: #C4D5DF;

border-style: solid;

border-width: 0 1px 1px;

}

/* lv1 */

.menu li.level1 a{

display: block;

height: 28px;

line-height: 28px;

background:#EBF3F8;

font-weight:700;

color: #5893B7;

text-indent: 14px;

border-top: 1px solid #C4D5DF;

}

.menu li.level1 a:hover{text-decoration:none;}

.menu li.level1 a.current{background:#B1D7EF;}

/* lv2 */

.menu li ul{overflow:hidden;}

.menu li ul.level2{display:none;}

.menu li ul.level2 li a{

display: block;

height: 28px;

line-height: 28px;

background:#ffffff;

font-weight:400;

color: #42556B;

text-indent: 18px;

border-top: 0px solid #ffffff;

overflow: hidden;

}

.menu li ul.level2 li a:hover{

color:#f60;

}

<script type="text/javascript"> 

$(document).ready(function(){ 

$(".level2 a").each(function(){ 

$this = $(this); 

if($this[0].href==String(window.location)){ 

$this.addClass("hover"); 

} 

}); 

}); 

</script>