<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" type="text/css" href="//at.alicdn.com/t/font_732107_8hzp99uacq9.css"/>
<style type="text/css">
li {
list-style: none;
background-color: #1b1a1a;
color: #efefef;
line-height: 40px;
cursor: pointer;
}
li div:hover {
background-color: #000;
color: #fff;
box-shadow: 0 0 10px rgba(0,0,0,0.8);
text-shadow: 0 0 2px rgba(255,255,255,0.8);
}
ul {
padding-left: 0;
300px;
overflow: hidden;
}
.first i {
margin-right: 4px;
font-size: 14px;
}
.second div {
padding-left: 28px;
}
.third div {
padding-left: 46px;
}
.second, .third {
display: none;
}
.qf {
float: right;
padding-right: 10px;
}
</style>
</head>
<body>
<ul class="first">
<li>
<div>一级菜单 <i class="qf qf-shop-plus"></i></div>
<ul class="second">
<li>
<div>二级菜单</div>
</li>
<li>
<div>二级菜单</div>
</li>
<li>
<div>二级菜单 <i class="qf qf-shop-plus"></i></div>
<ul class="third">
<li><div>三级菜单 </div></li>
<li><div>三级菜单 </div></li>
<li><div>三级菜单 </div></li>
</ul>
</li>
</ul>
</li>
<li>
<div> 一级菜单 <i class="qf qf-shop-plus"></i></div>
<ul class="second">
<li>
<div>二级菜单 <i class="qf qf-shop-plus"></i></div>
<ul class="third">
<li><div>三级菜单 </div></li>
<li><div>三级菜单 </div></li>
</ul>
</li>
</ul>
</li>
</ul>
<!-- <script type="text/javascript" src="jquery.js" ></script> -->
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script>
<script type="text/javascript">
//给所点击的li添加点击事件，find()找到对所有对应的子元素，添加slideToggle()的方法，组织事件冒泡
$('.first>li').on('click',function(){
$(this).find('.second').slideToggle();
event.stopPropagation();
})
$('.second>li').on('click',function(){
$(this).find('.third').slideToggle();
event.stopPropagation();
})
$("li").on('click', function() {
event.stopPropagation();
})
//替换类名，toggleClass()的方法iconfont的类名切换，以达到加号换减号的方法
$("li:has(ul)").on('click',function(){
var i = $(this).children('div').children('i');
i.toggleClass('qf-shop-plus').toggleClass('qf-shop-jianhaocu');
})
</script>
</body>
</html>