先給大家展示效果圖：
先看頁面代碼，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 代碼，主要設置背景色和子菜單左邊框的樣式，設置懸浮和選中的樣式，開始設置子菜單不顯示（通過 js 設置點擊之后再顯示）：
#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;}接下來就是點擊事件的代碼：
$(".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，會導致事件冒泡，所以在子菜單的點擊事件里面要組織冒泡，event.stopPropagation();
以上代碼很簡單，代碼就是注釋，jquery手風琴菜單就實現了。需要的朋友快來參考下吧。
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