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html & js：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>jQuery自适应网页顶部导航菜单</title>
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<div class="c-nav">
<div class="container navFlex">
<div class="flexItem">
<img class="logo" src="img/wunsun-logo.png" />
</div>
<div class="flexItem hiden">
<img class="btnImg" src="img/navBtn.png" />
</div>
<div class="flexItem show">
<ul>
<li><a href="#">首页</a></li>
<li><a href="#">品牌故事</a></li>
<li><a href="#">产品中心</a></li>
<li><a href="#">网上商城</a></li>
<li><a href="#">招商加盟</a></li>
<li><a href="#">行业新闻</a></li>
<li><a href="#">联系我们</a></li>
</ul>
</div>
</div>
</div>
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript">
//用于判断导航栏的状态
var toggle = true;
//导航栏按钮
$('.btnImg').click(function() {
if (toggle) {
$('.btnImg').css("border", "1px solid #b0ccf3");
toggle = false
} else {
$('.btnImg').css("border", "1px solid transparent");
toggle = true;
}
$(".show").slideToggle(300);
})
//窗口大小发生改变
$(window).resize(function() {
//获取窗口宽度
var windSize = $(window).width();
if (windSize > 576) {
$(".show").slideDown(0);
} else {
$(".show").slideUp(0);
}
});
</script>
</body>
</html>css：
*{margin:0;padding:0;list-style-type:none;}
.container{max-width:1140px;margin:0 auto;}
.c-nav .show{
display: inline-block;
}
.c-nav .hiden{
display: none;
}
/* 导航栏 */
.c-nav{
width: 100%;
background-color: black;
}
.c-nav .navFlex{
display: flex;
display: -webkit-flex;
justify-content:space-between;
-webkit-justify-content: space-between;
align-items: center;
-webkit-align-content: center;
color: white;
}
.c-nav ul{
list-style: none;
margin-bottom: 0px;
padding-left: 0px;
}
.c-nav ul li{
padding: 15px 0px 15px 0px;
margin-left: 30px;
display: inline-block;
}
.c-nav ul li a{
color: white;
padding-bottom: 2px;
text-decoration: none;
border-bottom: 3px solid transparent;
}
.c-nav ul li a:hover{
border-bottom: 3px solid #e4c17e;
}
.c-nav .logo{
height:40px;
}
.c-nav .btnImg{
height: 20px;
width: 25px;
padding: 3px 8px 3px 8px;
box-sizing: content-box;
border: 1px solid transparent;
}
@media screen and (max-width:1200px){
.c-nav ul li{
margin-left: 20px;
}
}
@media screen and (max-width:992px){
.c-nav ul li{
margin-left: 10px;
}
}
@media screen and (max-width:768px){
.c-nav ul li:nth-child(4),.c-nav ul li:nth-child(5){
display: none;
}
}
@media screen and (max-width:576px){
.c-nav{
background-color:rgba(176,204,243,0.8);
padding: 10px 0px 10px 0px;
opacity: 0.9;
}
.c-nav .navFlex{
flex-wrap:wrap;
font-size: 20px;
justify-content: space-between;
}
.c-nav .logo{
height: 30px;
}
.c-nav ul li{
padding-top: 10px;
margin-left: 0px;
display: block;
}
.c-nav ul li a{
border-bottom: 3px solid transparent;
}
.c-nav ul a:hover{
border-bottom: 3px solid #e4c17e;
}
.c-nav ul li:nth-child(4),.c-nav ul li:nth-child(5){
display: block;
}
.c-nav .hiden{
display: block;
}
.c-nav .show{
width: 100%;
font-size: 14px;
text-align: center;
display: none;
}
}素材图：
←透明图保存后查看
注：本程序依赖于jquery库，请自行下载并选择合适路径或使用远程cdn地址：https://cdn.bootcss.com/jquery/3.4.1/jquery.js