jquery三级导航
html：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>小米商城</title>
<link href="css/index.css" rel="stylesheet" type="text/css" />
<link href="css/commend.css" rel="stylesheet" type="text/css" />
<link href="css/font-awesome-4.7.0/css/font-awesome.min.css" rel="stylesheet" />
<script src="js/index.js" type="text/javascript" rel="script"></script>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>
<script>
$(document).ready(function() {
$('#two').hide();
$('#three').hide();
$('#hover').mouseover(function() {
$('.hader_cart').slideDown(500)
});
$('#hover').mouseleave(function() {
$('.hader_cart').slideUp(500)
});
$('.header_content>li').mouseover(function() {
$(this).find('#two').slideDown(500)
});
$('.header_content>li').mouseleave(function() {
$(this).find('#two').slideUp(500)
});
$('#two>li').mouseover(function() {
$(this).find('#three').slideDown(500)
});
$('#two>li').mouseleave(function() {
$(this).find('#three').slideUp(500)
});
})
</script>
</head>
<body>
<div class="header">
<div class="header_nav">
<ul class="header_content">
<li><a href="#">小米商城</a></li>
<li><a href="#">MIUI</a></li>
<li><a href="#">loT</a></li>
<li><a href="#">云服务</a></li>
<li><a href="#">金融</a></li>
<li><a href="#">优品</a></li>
<li><a href="#">小爱开放平台</a>
<ul id="two">
<li><a href="#">小爱同学</a></li>
<li><a href="#">小爱家居</a></li>
<li><a href="#">小米手环</a>
<ul id="three">
<li><a href="#">小爱同学</a></li>
<li><a href="#">小爱家居</a></li>
<li><a href="#">小米手环</a></li>
<li><a href="#">小米电视</a></li>
</ul>
</li>
<li><a href="#">小米电视</a></li>
</ul>
</li>
<li><a href="#">政企服务</a></li>
<li><a href="#">下载app</a></li>
<li><a href="#">Select Region</a></li>
<li></li>
<li><a href="#">登录</a></li>
<li><a href="#">注册</a></li>
<li><a href="#">消息通知</a></li>
<li><a href="#" id="hover">
<i class="fa fa-cart-arrow-down"></i>
购物车（0）
</a>
<div class="hader_cart">
<div>购物车中还没有商品，赶紧选购吧！</div>
</div>
</li>
</ul>
</div>
</div>
</body>
</html>
css;
a {
text-decoration: none;
color: #B0B0B0;
background: none
}
.header {
width: 100%;
height: auto;
}
.header_nav {
width: 100%;
background: #333333;
height: auto;
}
.header_content{
width: 1200px;
height: 40px;
margin: 0 auto !important;
display: flex;
align-items: center;
}
.header_content>li {
height: 40px;
float: left;
line-height: 40px;
font-size: 12px;
text-align: center;
border-right: 1px solid #424242;
position: relative;
}
a:hover {
color: white;
}
.header_content>li:nth-child(1) {
width: 60px;
}
.header_content>li:nth-child(2) {
width: 40px;
}
.header_content>li:nth-child(3) {
width: 40px;
}
.header_content>li:nth-child(4) {
width: 45px;
}
.header_content>li:nth-child(5) {
width: 40px;
}
.header_content>li:nth-child(6) {
width: 40px;
}
.header_content>li:nth-child(7) {
width: 100px;
}
.header_content>li:nth-child(8) {
width: 80px;
}
.header_content>li:nth-child(9) {
width: 80px;
}
.header_content>li:nth-child(10) {
width: 100px;
}
.header_content>li:nth-child(11) {
width: 270px;
}
.header_content>li:nth-child(12) {
width: 43px;
}
.header_content>li:nth-child(13) {
width: 43px;
}
.header_content>li:nth-child(14) {
width: 70px;
}
.header_content>li:nth-child(15) {
width: 130px;
height: 30px;
line-height: 30px;
}
.hader_cart {
position: absolute;
width: 320px;
height: 100px;
top: 36px;
left: -190px;
text-align: center;
font-size: 14px;
line-height: 100px;
display: none;
box-shadow: 1px 1px 5px 2px #E0E0E0;
}
.text {
width: 30%;
margin: 50px auto;
height: 200px;
border: 1px solid #ccc;
}
.text_top {
width: 95%;
padding-right: 5%;
text-align: right;
font-size: 13px;
height: 40px;
line-height: 40px;
}
.text_textarea {
width: 90%;
height: 100px;
margin-left: 5%;
}
.text_bottom {
width: 90%;
margin: 0 auto;
font-size: 12px;
}
.text_bottom div {
float: left;
width: 30px;
height: 40px;
}
.text_bottom div {
padding-left: 22px;
height: 40px;
line-height: 40px;
margin-left: 1%;
}
.text_bottom .text_b1 {
background: url(../img/表情.png) no-repeat left center;
background-size: 20px;
}
.text_bottom .text_b2 {
background: url(../img/图片2.png) no-repeat left center;
background-size: 20px;
}
.text_bottom .text_b3 {
background: url(../img/视频.png) no-repeat left center;
background-size: 20px;
}
.text_bottom .text_b4 {
background: url(../img/话题.png) no-repeat left center;
background-size: 20px;
}
.text_bottom .text_b5 {
background: url(../img/微博.png) no-repeat left center;
background-size: 20px;
}
.text_bottom .text_b6 {
background: url(../img/公开.png) no-repeat left center;
background-size: 20px;
}
.text_button {
width: 80px;
height: 30px;
line-height: 30px;
margin: 1% 0% 1% 8.9%;
background: cornflowerblue;
color: white;
font-size: 12px;
}
#two{
position: absolute;
top: 40px;
left: 0px;
width: 100px;
height: auto;
background: #333333;
color: #B0B0B0 !important;
}
#tow>li{
top: 0;
left: 0;
width: 100%;
border-right: none;
border-bottom: 1px solid #424242;
height: 50px;
line-height: 50px;
font-size: 14px;
}
#three{
position: absolute;
top: 80px;
left: 100px;
width: 100px;
height: auto;
background: #333333;
color: #B0B0B0 !important;
}