大众点评 分类 导航 (jquery版)

                  简单   轻盈    快速    高效！

html结构：

<div id="menu">
  <ul id="G_chan-panel" class="pop-panel pp_channels Fix" style="position: absolute; visibility: visible; z-index: 1001; top: 175px; left: 189px; ">
    <li class="root-item  "> <a href="#" class="root-name"><span>餐饮</span></a>
      <ul class="pop-panel Fix sub-list">
        <li class="main-cate"><a href="#">餐饮频道</a></li>
        <li><a href="#">粤菜</a></li>
      ...
      </ul>
    </li>
    <li class="root-item"> <a href="#" class="root-name"><span>购物</span></a>
      <ul class="pop-panel Fix sub-list">
        <li class="main-cate"><a href="#">购物频道</a></li>
        <li><a href="#">超市/便利店</a></li>
         ...
        <li><a href="#">其他</a></li>
      </ul>
    </li>
   
  </ul>
</div>

jquery代码：

<script type="text/javascript">
    $(function () {        
        $('#G_chan-panel').delegate("li", "mouseenter", function () { $(this).addClass("active") });
        $('#G_chan-panel').delegate("li", "mouseleave", function () { $(this).removeClass("active") });        
    }); 
</script>

css样式：

BODY {
    background-color:#fff;
    color:#555;
    font: 9pt/14px Tahoma, "宋体", Arial, Helvetica, Sans-Serif;
    letter-spacing: 0;
    margin: 0;
}
html, body, ul, ol, li, dl, dt, dd, p, h1, h2, h3, h4, h5, h6, a, img, th, td, form, fieldset, iframe, object, pre, code, legend, blockquote {
    border: 0 none;
    margin: 0;
    outline: 0 none;
    padding: 0;
}
h1, h2, h3, h4, h5, h6 {
    font-size: 100%;
    font-weight: normal;
}
UL, LI {
    list-style: none outside none;
    margin: 0;
    padding: 0;
}
IMG {
    border: medium none;
    margin: 0;
    padding: 0;
    cursor:pointer;
}
input, img, select {
    vertical-align: middle;
}
A {
    color: #666666;
}
A:link {
    color: #666666;
    text-decoration: none;
}
A:visited {
    color: #666666;
    text-decoration: none;
}
A:hover {
    color: #C90809;
    text-decoration: none;
}
/*导航*/


 .pp_channels .root-item, .pp_channels .root-name, .pp_channels .root-name span, .pp_channels .sub-list li a {
    background-image: url("bg.png");
    background-repeat: no-repeat;
}
.G_chan-panel {
    position: absolute;
    z-index: 1000;
    top: 120px;
    left: 199px;
    visibility: hidden;
}
.pp_channels {
    width: 138px;
    padding: 0;
    border-width: 0 0 2px 1px;
    border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    -moz-box-shadow: -1px 1px 1px #ccc;
    -webkit-box-shadow: 0 1px 5px #ccc;
    box-shadow: 0 1px 5px #ccc;
}
.pp_channels .root-item {
    zoom: 1;
    position: relative;
    width: 139px;
    height: 34px;
    background-position: -13px -373px;
    overflow: visible;
    vertical-align: middle;
}
.pp_channels .root-name {
    display: block;
    z-index: 1001;
    position: relative;
    border-top:1px solid #B9F5D2;
    padding-left: 10px;
    background-position: -10px -358px;
    cursor: pointer;
}
.pp_channels .root-name span {
    display: block;
    border-right: 1px solid #B9F5D2;
    padding-left: 9px;
    height: 34px;
    font-size: 1.2em;
    line-height: 34px;
    color: #000;
    background-position: -167px -358px;
}
.pp_channels .active .root-name {
    background: #fff;
}
.pp_channels .active .root-name span {
    color: #C00;
    border-color: #fff;
}
.pp_channels .no-sub .root-name span {
    border-color: #fff;
    background-position: 20px -358px;
}
.pp_channels .sub-list {
    left: 138px;
    top: -34px;
    padding: 5px 2px 5px 16px;
    width: 200px;
    overflow: hidden;
    _top: -35px;
    -moz-box-shadow: -1px 1px 1px #ccc;
    -webkit-box-shadow: 0 1px 5px #ccc;
    box-shadow: 0 1px 5px #ccc;
}
.pp_channels .active .sub-list {
    visibility: visible;
}
.pp_channels .sub-list li {
    float: left;
    width: 83px;
    margin: 0 10px 5px 0;
}
.pp_channels .sub-list .main-cate {
    width: 200px;
    margin-right: -10px;
    font-weight: bold;
}
.pp_channels .sub-list a {
    padding-left: 3px;
    line-height: 21px;
    background-position: -169px -418px;
 *background-position: -169px -420px;
}
.pp_channels .sub-list a: hover {
    background-position: -169px -438px;
 *background-position: -169px -440px;
}
.pop-panel {
    z-index: 1000;
    position: absolute;
    visibility: hidden;
    border: 1px solid #B9F5D2;
    padding: 5px 9px;
    background: #fff;
    color: #61646E;
 #margin-left:-0px;
    _margin-left:-0px;
}
.pop-panel a {
    color: #61646E;
}
.pop-panel a: hover {
    text-decoration:none;
    color: #C00;
}

其他一些应用：

         //定位
         var X = $('#G_chan').offset().top;
        var Y = $('#G_chan').offset().left;
        $("#G_chan-panel").offset({ top: X + 36, left: Y - 5 });
         //鼠标经过 动画效果 防点击链接跳转
        $("#G_chan").hover(function (event) {
            event || event.stopPropagation(); $("#G_chan-panel").slideDown().mouseleave(function () {
                $(this).slideUp()
            });
        });

//点击 城市列表 下拉动画 防冒泡 
$("#G_loc").click(function (event) { event.preventDefault(); $("#G_loc-panel").slideToggle("slow"); });