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16.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>二级菜单</title>
</head>
<style>
*{
padding:0;
margin:0;
}
.fir{
border:1px solid black;
width:400px;
margin:100px auto;
list-style: none;
border-radius:10px;
}
.sec{
list-style: none;
background-color: mediumpurple;
border-top:1px solid black;
}
.sec li:hover{
background-color: red;
}
.fir li{
text-indent:30px;
border-top:1px solid black;
line-height:40px;
}
.fir li:first-child{
border-top:none;
}
.hidden{
display:none;
}
</style>
<script src="js/jquery-1.12.4.js"></script>
<script type="text/javascript">
$(function(){
$('.fir li').click(function(event){
$(this).siblings().children("ul").slideUp(500);//选择一级菜单其他兄弟元素的子元素ul 做slideUp
$(this).children("ul").stop();//取消前一个动画效果 防止动画队列拥堵 导致重复执行动画 用户无法点击
$(this).children("ul").slideToggle(500);//让点击的那个菜单展开
event.stopPropagation();//取消冒泡
});
});
</script>
<body>
<ul class="fir">
<li>一级菜单<span></span>
<ul class="sec hidden">
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
</ul>
</li>
<li>一级菜单<span></span>
<ul class="sec hidden">
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
</ul>
</li>
<li>一级菜单<span></span>
<ul class="sec hidden">
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
</ul>
</li>
<li>一级菜单<span></span>
<ul class="sec hidden">
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
</ul>
</li>
<li>一级菜单<span></span>
<ul class="sec hidden">
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
</ul>
</li>
<li>一级菜单<span></span>
<ul class="sec hidden">
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
</ul>
</li>
</ul>
</body>
</html>