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<script src="http://libs.baidu.com/jquery/1.11.1/jquery.min.js"></script>
<title>折叠</title>
<style>
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margin:0;
padding: 0;
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text-decoration: none;
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.page{
width: 100%;
margin-top: 10px;
background: #f2f2f2;
}
</style>
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<body>
<ul>
<li class="page">
<a class="a">
一级菜单
</a>
<ul class="ul">
<li>
隐藏的二级菜单项
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<li>
隐藏的二级菜单项
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隐藏的二级菜单项
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</ul>
</li>
<li class="page">
<a class="a">
一级菜单
</a>
<ul class="ul">
<li>
隐藏的二级菜单项
</li>
<li>
隐藏的二级菜单项
</li>
<li>
隐藏的二级菜单项
</li>
</ul>
</li>
<li class="page">
<a class="a">
一级菜单
</a>
<ul class="ul">
<li>
隐藏的二级菜单项
</li>
<li>
隐藏的二级菜单项
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<script>
jQuery(function($){
$(".a").click(function(){
$(this).next(".ul").toggle().closest(".page").siblings(".page").children("ul").hide();
}).next("ul").hide();
});
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