abstract：<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0">&
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>三級(jí)下拉菜單</title>
<script type="text/javascript" src="jquery-3.3.1.min.js"></script>
<style>
*{margin:0;padding: 0}
.menu{width: 800px;height: 35px;margin: 0px auto;background: #000;margin-top: 20px;color:#fff;border: 1px solid #ccc;border-radius: 5px;}
ul{list-style:none;}
ul li{width: 100px;height: 35px;line-height: 35px;text-align: center;float: left;border-right: 1px solid #ccc;cursor: pointer;}
.twobox li{width: 100px;height: 30px;line-height: 30px;background: #2D2D2D;color:#A9A9A9;font-size: 14PX;position: relative;border: 0px;}
.twobox li:hover{background: #000;color:#fff;}
.three {position: absolute;top:0px;left: 100px;}
.three li{
width: 99px;height: 30px;line-height: 30px;border:0px;
}
</style>
<script type="text/javascript">
$(document).ready(function(){
$('.twobox').hide();
$('.three').hide();
$('.one>li').mouseover(function(){
$(this).find('.twobox').slideDown(500);
})
$('.one>li').mouseleave(function(){
$(this).find('.twobox').slideUp(500);
})
$('.two').mouseover(function(){
$(this).find('.three').slideDown(500);
})
$('.two').mouseleave(function(){
$(this).find('.three').slideUp(500);
})
})
</script>
</head>
<body>
<div class="menu">
<ul class="one">
<li>首頁(yè)</li>
<li>產(chǎn)品
<ul class="twobox">
<li>產(chǎn)品1</li>
<li class="two">產(chǎn)品2
<ul class="three">
<li>產(chǎn)品1.1</li>
<li>產(chǎn)品1.2</li>
<li>產(chǎn)品1.3</li>
<li>產(chǎn)品1.4</li>
</ul>
</li>
<li class="two">產(chǎn)品3
<ul class="three">
<li>產(chǎn)品3.1</li>
<li>產(chǎn)品3.2</li>
<li>產(chǎn)品3.3</li>
<li>產(chǎn)品3.4</li>
</ul>
</li>
<li>產(chǎn)品4</li>
</ul>
</li>
<li>公司新聞
<ul class="twobox">
<li>公司新聞1</li>
<li class="two">公司新聞2
<ul class="three">
<li>公司新聞2.1</li>
<li>公司新聞2.2</li>
<li>公司新聞2.3</li>
<li>公司新聞2.4</li>
</ul>
</li>
<li>公司新聞3</li>
<li>公司新聞4</li>
</ul>
</li>
<li>行業(yè)新聞</li>
<li>聯(lián)系我們
<ul class="twobox">
<li>郵箱</li>
<li>熱線</li>
</ul>
</li>
</ul>
</div>
</body>
</html>