仿中文网的简单导航
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>三级下拉菜单</title>
<script type="text/javascript" src="../jquery-3.4.1.min.js"></script>
<style>
*{margin: 0px;padding: 0px}
.menu{width: 830px;height: 35px;margin: 0px auto;background: #000;margin-top: 20px;
color: #fff;border: 1px solid #cccccc;border-radius: 5px}
ul{list-style-type: none}
ul li {width: 100px;height: 30px;line-height: 35px;text-align: center;float: left;border-right: 1px solid #cccccc;cursor: pointer}
.twobox li{width: 100px;height: 35px;line-height: 35px;background: #2D2D2D;color: #A9A9A9;font-size: 14px;position: relative;border: 0px}
.twobox li :hover{background: orangered;color: green}
.three{position: absolute;top: 0px;left: 100px}
.three li{width: 99px;height: 30px;line-height: 30px;border: 0}
.one li :hover{background: orangered;color: green;border-bottom: 2px solid white}
</style>
<script type="text/javascript">
$(document).ready(function () {
$('.twobox').hide();
$('.three').hide();
$('.one>li').mouseover(function () {
$(this).find('.twobox').slideDown(600)
});
$('.one>li').mouseleave(function () {
$(this).find('.twobox').slideUp(600)
});
$('.two').mouseover(function () {
$(this).find('.three').slideDown(600)
});
$('.two').mouseleave(function () {
$(this).find('.three').slideUp(600)
});
})
</script>
</head>
<body>
<div class="menu">
<ul class="one">
<li>首页</li>
<li>视频教程
<ul class="twobox">
<li class="two">PHP
<ul class="three">
<li>PeterZhu教程</li>
<li>独孤教程</li>
</ul>
</li>
<li>JS
<ul class="three">
<li>灭绝教程</li>
<li>东方不败教程</li>
</ul>
</li>
<li>JQ</li>
<li>MYSQL</li>
</ul>
</li>
<li>社区问答</li>
<li>特色课程</li>
<li>技术文章</li>
<li>编程词典</li>
<li>资源下载
<ul class="twobox">
<li>手册下载</li>
<li>工具下载
<ul class="three">
<li>PHP工具箱</li>
<li>PHPStorm</li>
<li>subtext</li>
</ul>
</li>
<li>类库下载</li>
</ul>
</li>
<li>菜鸟学堂</li>
</ul>
</div>
</body>
</html>