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:"/5b8b/4f53","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>