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先看页面代码，列表的嵌套：
<div id="menuDiv"> <ul id="menu"> <li class="parentLi"> <span>B</span> <ul class="childrenUl"> <li class="childrenLi"><span>C</span></li> <li class="childrenLi"><span>C</span></li> <li class="childrenLi"><span>C</span></li> </ul> </li> <li class="parentLi"> <span>B</span> <ul class="childrenUl"> <li class="childrenLi"><span>C</span></li> <li class="childrenLi"><span>C</span></li> <li class="childrenLi"><span>C</span></li> </ul> </li> <li class="parentLi"> <span>B</span> <ul class="childrenUl"> <li class="childrenLi"><span>C</span></li> <li class="childrenLi"><span>C</span></li> <li class="childrenLi"><span>C</span></li> </ul> </li> </ul> </div>
css 代码，主要设置背景色和子菜单左边框的样式，设置悬浮和选中的样式，开始设置子菜单不显示（通过 js 设置点击之后再显示）：
#menuDiv{
width: 200px;
background-color: #029FD4;
}
.parentLi
{
width: 100%;
line-height: 40px;
margin-top: 1px;
background: #1C73BA;
color: #fff;
cursor: pointer;
font-weight:bolder;
}
.parentLi span
{
padding: 10px;
}
.parentLi:hover, .selectedParentMenu
{
background: #0033CC;
}
.childrenUl
{
background-color: #ffffff;
display: none;
}
.childrenLi
{
width: 100%;
line-height: 30px;
font-size: .9em;
margin-top: 1px;
background: #63B8FF;
color: #000000;
padding-left: 15px;
cursor: pointer;
}
.childrenLi:hover, .selectedChildrenMenu
{
border-left: 5px #0033CC solid;
background: #0099CC;
padding-left: 15px;
}
接下来就是点击事件的代码：
$(".parentLi").click(function(event) {
$(this).children(‘.childrenUl‘).slideToggle();
});
$(".childrenLi").click(function(event) {
event.stopPropagation();
$(".childrenLi").removeClass(‘selectedChildrenMenu‘);
$(".parentLi").removeClass(‘selectedParentMenu‘);
$(this).parents(".parentLi").addClass(‘selectedParentMenu‘);
$(this).addClass(‘selectedChildrenMenu‘);
});
需要注意的是列表嵌套，会导致事件冒泡，所以在子菜单的点击事件里面要组织冒泡，event.stopPropagation();
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原文地址：http://www.cnblogs.com/shouce/p/4975522.html
