折叠菜单
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
body,div,h3,ul,li{margin:0px; padding:0px;}
h3{font-size:100%; font-weight:normal;}
#accordion{width:225px; margin:10px 0 10px 10px}
.accordion-header{background:#3971ac; color:#fff; border-bottom:1px solid #fff; position:relative;}
.accordion-header h3{margin:0; cursor:pointer; text-indent:10px; padding:5px 0;}
.header-active{background:#48abc3;}
.accordion-header span{display:block; position:absolute; width:11px; height:12px; top:5px; left:200px; background:url(images/topcis.jpg);}
.icon-active{display:block; position:absolute; width:11px; height:12px; top:5px; left:200px; background:url(images/topcis.jpg); background-position:0 -12px;}
.accordion-content{margin:0; padding:5px 5px 10px 5px; list-style-type:none; background:#a8d7e2;}
.accordion-content li{padding:1px 0px; display:block; margin:0; padding:2px 5px;}
.accordion-content li a{color:#d16c3a;}
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<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$(".accordion-content").not(":first").hide(); //除第一个外其余隐藏；
//$(".accordion-content:first").show(); //确保第一个显示；
$(".accordion-content:first").addClass("header-active"); //高亮显示
$(".accordion-content:first").find("span").addClass("icon-active");
$(".accordion-header").click(function(){
$(".accordion-content:visible").slideUp("slow").prev().removeClass("header-active");
$(".icon-active:visible").removeClass("icon-active");
$(this).addClass("header-active").next().slideDown("slow");
$(this).find("span").addClass("icon-active");
})
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</head>
<body>
<div id="accordion">
<div class="accordion-header">
<h3>Books</h3>
<span></span>
</div>
<ul class="accordion-content">
<li><a href="#">Business</a></li>
<li><a href="#">Business</a></li>
<li><a href="#">Business</a></li>
<li><a href="#">Business</a></li>
</ul>
<div class="accordion-header">
<h3>Electronics</h3>
<span></span>
</div>
<ul class="accordion-content">
<li><a href="#">Business</a></li>
<li><a href="#">Business</a></li>
<li><a href="#">Business</a></li>
<li><a href="#">Business</a></li>
</ul>
<div class="accordion-header">
<h3>Sporting</h3>
<span></span>
</div>
<ul class="accordion-content">
<li><a href="#">Business</a></li>
<li><a href="#">Business</a></li>
<li><a href="#">Business</a></li>
<li><a href="#">Business</a></li>
</ul>
</div>
</body>
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