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<html>
<head>
<meta charset="utf-8">
<title>侧边导航</title>
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<script src="jquery-1.3.2.js" type="text/javascript"></script>
<style>
.subNavBox{width:200px;border:solid 1px #e5e3da;margin:100px auto;}
.subNav{border-bottom:solid 1px #e5e3da;cursor:pointer;font-weight:bold;font-size:14px;color:#999;line-height:28px;padding-left:10px;background:url(images/jiantou1.jpg) no-repeat;background-position:95% 50%}
.subNav:hover{color:#277fc2;}
.currentDd{color:#277fc2}
.currentDt{background-image:url(images/jiantou.jpg);}
.navContent{display: none;border-bottom:solid 1px #e5e3da;}
.navContent li a{display:block;width:200px;heighr:28px;text-align:center;font-size:14px;line-height:28px;color:#333}
.navContent li a:hover{color:#fff;background-color:#277fc2}
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$(function(){
$(".subNav").click(function(){
$(this).toggleClass("currentDd").siblings(".subNav").removeClass("currentDd")
$(this).toggleClass("currentDt").siblings(".subNav").removeClass("currentDt")
$(this).next(".navContent").slideToggle(300).siblings(".navContent").slideUp(500)
})
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<div class="subNavBox">
<div class="subNav currentDd currentDt">新闻中心</div>
<ul class="navContent " style="display:block">
<li><a href="#">添加新闻</a></li>
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