代码部分：
{if $r[arrchildid]}
{pc:content action=”category” catid=”$r[catid]” num=”10″ siteid=”$siteid” order=”listorder asc” return=”data2″}
{loop $data2 $v}
{/loop}
{/pc}
{/if}
css：
.drop-nav span{
border-top: 1px solid #a9b7c5;
}
.drop-nav-child{
display: block;
width: 90px;
height: 38px;
padding-top: 8px!important;
margin: auto;
background-color: #fff;
}
.drop-nav {
display: none!important;
padding: 0px 0px!important;
}
li:hover .drop-nav{
display: block!important;
}
总结：主要实现调用二级菜单栏，以及鼠标经过显示功能;
