body{ font:14px "Microsoft YaHei", Arial,Verdana,tahoma, Srial, helvetica, sans-serif; line-height:1.8; color:#333; background:#fff;}.menu {height: 40px; background: #4ba036;position: relative; z-index:999;}.menu a {	text-decoration: none;display: block; padding: 0 12px; margin-right: 1px; line-height: 40px; font-size: 16px; color: #fff;}ul {	margin: 0;	padding: 0;}.menu li {	list-style: none;	float: left;	width: 90px;	overflow: visible;	cursor: pointer;}ul.level0 {	height: 40px;	overflow: visible;}ul.level1, ul.level2, ul.level3 {	width: 90px;	display: none;}ul.level2, ul.level3 {	margin: -28px 0 0 90px;}ul.level0 > li {	height: 40px;	line-height: 40px;	text-align: center;	background: #4ba036;}ul.level1 > li, ul.level2 > li, ul.level3 > li {	height: 40px;	line-height: 40px;	background: #308a1a;}ul.level0 > li:hover {	background: #308a1a;}ul.level1 > li:hover, ul.level2 > li:hover, ul.level3 > li:hover {	background: #4ba036;}ul.level0 > li.imyeah:hover > ul, ul.level1 > li.imyeah:hover > ul, ul.level2 > li.imyeah:hover > ul, ul.level3 > li.imyeah:hover > ul {	display: block;}

<div class="menu">  <div class="bar">    <ul class="level0">      <li><a href="/">首页</a></li>      {dede:channelartlist typeid="top" row='18' currentstyle="<li class='active'><a href='~typelink~' ~rel~><span>~typename~</span></a></li>"}      <li class="imyeah"><a href="{dede:field name="typeurl"/}" target="_blank">{dede:field name="typename"/}</a>        <ul class="level1">          {dede:channel type="son"}          <li><a href="[field:typeurl/]" title="[field:typename/]">[field:typename/]</a></li>          {/dede:channel}        </ul>      </li>      {/dede:channelartlist}    </ul>  </div></div>