纯css制作多级导航菜单弹出效果，当用户的鼠标经过菜单时弹出下拉多级菜单显示，可根据需求自定义级数。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<HEAD>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
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<TITLE>CSS设计导航菜单弹出多级下拉菜单特效_武鸣人</TITLE>
<style type="text/css">
<!--
body {
font: 12px/1.6em Tahoma,Verdana;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
margin-left: 0px;
line-height: 16.8px;
}
#nav_wuming {
Z-INDEX: 500; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; HEIGHT: 27px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px
}
#nav_wuming LI.top {
DISPLAY: block; FLOAT: left; HEIGHT: 27px;
}
#nav_wuming LI A.top_wuming_ren {
PADDING-BOTTOM: 0px; LINE-HEIGHT: 27px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; DISPLAY: block; FLOAT: left; HEIGHT: 27px; FONT-SIZE: 12px; CURSOR: pointer; FONT-WEIGHT: bold; TEXT-DECORATION: none; PADDING-TOP: 0px
}
#nav_wuming LI A.top_wuming_ren SPAN {
PADDING-BOTTOM: 0px; WIDTH: 80px; DISPLAY: block; text-align:center; FLOAT: left; HEIGHT: 27px; PADDING-TOP: 0px
}
#nav_wuming LI A.top_wuming_ren SPAN.down {
PADDING-BOTTOM: 0px; WIDTH: 80px; DISPLAY: block; text-align:center; BACKGROUND: url(/img/20240423_www_wuming_ren_44.gif) no-repeat right; FLOAT: left; HEIGHT: 27px; PADDING-TOP: 0px
}
#nav_wuming LI:hover A.top_wuming_ren {
background-color:#548bcf; color:#fff2ee;
}
#nav_wuming LI:hover A.top_wuming_ren SPAN {
background-color:#548bcf; color:#fff2ee;
}
#nav_wuming LI:hover A.top_wuming_ren SPAN.down {
background-color:#548bcf; color:#fff2ee;BACKGROUND: url(/img/20240423_www_wuming_ren_45.gif) no-repeat right;
}
#nav_wuming LI:hover {
Z-INDEX: 200; POSITION: relative
}
#nav_wuming LI:hover UL.sub_wuming_ren {
Z-INDEX: 270; BORDER-BOTTOM: #ddd 1px solid; BORDER-LEFT: #ddd 1px solid; PADDING-BOTTOM: 0px; PADDING-LEFT: 0px; WIDTH: 150px; PADDING-RIGHT: 0px; WHITE-SPACE: nowrap; BACKGROUND: #e1ecf6; HEIGHT: auto; BORDER-TOP: #ddd 1px solid; TOP: 27px; BORDER-RIGHT: #ddd 1px solid; PADDING-TOP: 0px; LEFT: 1px
}
#nav_wuming LI:hover UL.sub_wuming_ren LI {
POSITION: relative; WIDTH: 150px; DISPLAY: block; FLOAT: left; HEIGHT: 19px; FONT-WEIGHT: normal
}
#nav_wuming LI:hover UL.sub_wuming_ren LI A {
BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; LINE-HEIGHT: 19px; TEXT-INDENT: 5px; WIDTH: 150px; DISPLAY: block; HEIGHT: 19px; COLOR: #000; FONT-SIZE: 12px; BORDER-TOP: 0px; BORDER-RIGHT: 0px; TEXT-DECORATION: none
}
#nav_wuming LI UL.sub_wuming_ren LI A.fly {
BACKGROUND: url(/img/20240423_www_wuming_ren_46.gif) #e1ecf6 no-repeat left center
}
#nav_wuming LI:hover UL.sub_wuming_ren LI A:hover {
BACKGROUND: url(/img/20240423_www_wuming_ren_47.gif) #548bcf repeat-x center center; COLOR: #fff;
}
#nav_wuming LI:hover UL.sub_wuming_ren LI A.fly:hover {
BACKGROUND: url(/img/20240423_www_wuming_ren_48.gif) #548bcf no-repeat left center; COLOR: #fff
}
#nav_wuming LI:hover LI:hover UL {
Z-INDEX: 400; BORDER-BOTTOM: #ddd 1px solid; BORDER-LEFT: #ddd 1px solid; PADDING-BOTTOM: 0px; PADDING-LEFT: 0px; WIDTH: 150px; PADDING-RIGHT: 0px; WHITE-SPACE: nowrap; BACKGROUND: #e1ecf6; HEIGHT: auto; BORDER-TOP: #ddd 1px solid; TOP: -1px; BORDER-RIGHT: #ddd 1px solid; PADDING-TOP: 0px; LEFT: 144px
}
#nav_wuming LI:hover LI:hover LI:hover UL {
Z-INDEX: 400; BORDER-BOTTOM: #ddd 1px solid; BORDER-LEFT: #ddd 1px solid; PADDING-BOTTOM: 0px; PADDING-LEFT: 0px; WIDTH: 150px; PADDING-RIGHT: 0px; WHITE-SPACE: nowrap; BACKGROUND: #e1ecf6; HEIGHT: auto; BORDER-TOP: #ddd 1px solid; TOP: -1px; BORDER-RIGHT: #ddd 1px solid; PADDING-TOP: 0px; LEFT: 144px
}
#nav_wuming LI:hover LI:hover LI:hover LI:hover UL {
Z-INDEX: 400; BORDER-BOTTOM: #ddd 1px solid; BORDER-LEFT: #ddd 1px solid; PADDING-BOTTOM: 0px; PADDING-LEFT: 0px; WIDTH: 150px; PADDING-RIGHT: 0px; WHITE-SPACE: nowrap; BACKGROUND: #e1ecf6; HEIGHT: auto; BORDER-TOP: #ddd 1px solid; TOP: -1px; BORDER-RIGHT: #ddd 1px solid; PADDING-TOP: 0px; LEFT: 144px
}
#nav_wuming LI:hover LI:hover LI:hover LI:hover LI:hover UL {
Z-INDEX: 400; BORDER-BOTTOM: #ddd 1px solid; BORDER-LEFT: #ddd 1px solid; PADDING-BOTTOM: 0px; PADDING-LEFT: 0px; WIDTH: 150px; PADDING-RIGHT: 0px; WHITE-SPACE: nowrap; BACKGROUND: #e1ecf6; HEIGHT: auto; BORDER-TOP: #ddd 1px solid; TOP: -1px; BORDER-RIGHT: #ddd 1px solid; PADDING-TOP: 0px; LEFT: 144px
}
#nav_wuming UL {
POSITION: absolute; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; TOP: -9999px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px; LEFT: -9999px
}
#nav_wuming LI:hover UL UL {
POSITION: absolute; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; TOP: -9999px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px; LEFT: -9999px
}
#nav_wuming LI:hover LI:hover UL UL {
POSITION: absolute; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; TOP: -9999px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px; LEFT: -9999px
}
#nav_wuming LI:hover LI:hover LI:hover UL UL {
POSITION: absolute; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; TOP: -9999px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px; LEFT: -9999px
}
#nav_wuming LI:hover LI:hover LI:hover LI:hover UL UL {
POSITION: absolute; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; TOP: -9999px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px; LEFT: -9999px
}
#nav_wuming LI:hover LI:hover A.fly {
BORDER-BOTTOM-COLOR: #fff; BORDER-TOP-COLOR: #fff; BACKGROUND: url(/img/20240423_www_wuming_ren_48.gif) #548bcf no-repeat left center; COLOR: #fff; BORDER-RIGHT-COLOR: #fff; BORDER-LEFT-COLOR: #fff;
}
#nav_wuming LI:hover LI:hover LI:hover A.fly {
BORDER-BOTTOM-COLOR: #fff; BORDER-TOP-COLOR: #fff; BACKGROUND: url(/img/20240423_www_wuming_ren_48.gif) #548bcf no-repeat left center; COLOR: #fff; BORDER-RIGHT-COLOR: #fff; BORDER-LEFT-COLOR: #fff;
}
#nav_wuming LI:hover LI:hover LI:hover LI:hover A.fly {
BORDER-BOTTOM-COLOR: #fff; BORDER-TOP-COLOR: #fff; BACKGROUND: url(/img/20240423_www_wuming_ren_48.gif) #548bcf no-repeat left center; COLOR: #fff; BORDER-RIGHT-COLOR: #fff; BORDER-LEFT-COLOR: #fff;
}
#nav_wuming LI:hover LI:hover LI:hover LI:hover LI:hover A.fly {
BORDER-BOTTOM-COLOR: #fff; BORDER-TOP-COLOR: #fff; BACKGROUND: url(/img/20240423_www_wuming_ren_48.gif) #548bcf no-repeat left center; COLOR: #fff; BORDER-RIGHT-COLOR: #fff; BORDER-LEFT-COLOR: #fff;
}
#nav_wuming LI:hover LI:hover LI A.fly {
BORDER-BOTTOM-COLOR: #e1ecf6; BORDER-TOP-COLOR: #e1ecf6; BACKGROUND: url(/img/20240423_www_wuming_ren_46.gif) #e1ecf6 no-repeat left center; COLOR: #000; BORDER-RIGHT-COLOR: #e1ecf6; BORDER-LEFT-COLOR: #e1ecf6
}
#nav_wuming LI:hover LI:hover LI:hover LI A.fly {
BORDER-BOTTOM-COLOR: #e1ecf6; BORDER-TOP-COLOR: #e1ecf6; BACKGROUND: url(/img/20240423_www_wuming_ren_46.gif) #e1ecf6 no-repeat left center; COLOR: #000; BORDER-RIGHT-COLOR: #e1ecf6; BORDER-LEFT-COLOR: #e1ecf6
}
#nav_wuming LI:hover LI:hover LI:hover LI:hover LI A.fly {
BORDER-BOTTOM-COLOR: #e1ecf6; BORDER-TOP-COLOR: #e1ecf6; BACKGROUND: url(/img/20240423_www_wuming_ren_46.gif) #e1ecf6 no-repeat left center; COLOR: #000; BORDER-RIGHT-COLOR: #e1ecf6; BORDER-LEFT-COLOR: #e1ecf6
}
-->
</style>
</HEAD>
<BODY>
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<LI><A href="https://www.wuming.ren">武鸣人一号</A></LI>
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