拖动的页面 滚动导航固定上方
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
*{
margin: 0;
padding: 0;
}
.bg-img{
background: url("http://9yin2.woniu.com/static/web201703/images/bg.jpg") center top repeat;
width: 100%;
height: 1080px;
}
.top-p{
width: 100%;
height: 130px;
background: rgba(30, 33, 35,0.8);
}
.w-100{
width: 100%;
}
.op-02{
opacity: 0.2;
}
.white{
color: white;
}
.d-flex{
display: flex;
}
.just-btw{
justify-content: space-between;
}
.just-round{
justify-content: space-around;
}
.just-center{
justify-content: center;
}
.pd-1{
padding: 5px;
}
.pd-2{
padding: 10px;
}
.pd-3{
padding: 15px;
}
.pd-4{
padding: 20px;
}
.pd-5{
padding: 25px;
}
.pd-6{
padding: 30px;
}
.mr-1{
margin: 5px;
}
.mr-2{
margin: 10px;
}
.mr-3{
margin: 15px;
}
.mr-4{
margin: 20px;
}
.mr-5{
margin: 25px;
}
.mr-6{
margin: 30px;
}
.f-size-14{
font-size: 14px;
}
.f-size-16{
font-size: 16px;
}
.f-size-18{
font-size: 18px;
}
.f-size-20{
font-size: 20px;
}
.f-size-12{
font-size: 12px;
}
.cursor{
cursor:pointer;
}
.inde{
z-index: -1;
}
.new-box{
width: 100%;
height: 1072px;
display: block;
background: url("http://9yin2.woniu.com/static/web201703/images/p2_bg.jpg") center top repeat;
}
.feature-box{
width: 100%;
height: 1113px;
background: url("http://9yin2.woniu.com/static/web201703/images/p3_bg.jpg") center top repeat;
}
.w-1200{
width: 1200px;
}
.m-center{
margin: 10px auto;
}
.pos-abv{
position: absolute;
}
</style>
</head>
<body>
<div id="top"><img src="http://9yin.woniu.com/static/web201588/images/bg.jpg?v1" alt=""></div>
<section class="pos-abv w-100" id="nav">
<div class="d-flex just-btw w-100 top-p">
<div><img src="http://9yin2.woniu.com/static/web201703/images/logo.png" alt=""></div>
<div class="d-flex just-round f-size-18 white">
<div class="mr-4 cursor">
<p class="">官网首页</p><p>HOME</p>
</div>
<div class="mr-4 cursor">
<p>新闻资讯</p><p>NEWS</p>
</div>
<div class="mr-4 cursor">
<p>研发手札</p><p>DEV SKETCH</p>
</div>
<div class="mr-4 cursor">
<p>官方论坛</p><p>FORUM</p>
</div>
<div class="mr-4 cursor">
<p>蜗牛游戏</p><p>GAME</p>
</div>
</div>
</div>
<div>
<div>
<img src="http://9yin2.woniu.com/static/web201703/images/slogan.png" alt="">
</div>
</div>
</section>
<div id="myMain">
<section class="bg-img"></section>
<section class="new-box">
<div class="w-1200 m-center pd-6">
<img src="https://img.php.cn/upload/image/136/485/911/1638173810418146.gif" alt="">
</div>
</section>
<section class="feature-box">
<div class="w-1200 m-center pd-6 w">
<img src="https://img.php.cn/upload/image/407/312/793/1638173840327201.gif" alt="">
</div>
</section>
</div>
<script>
window.onload = function (){
var top =document.getElementById('top')
var myMain =document.getElementById('myMain')
var nav = document.getElementById('nav')
window.onscroll = function (){
if (document.documentElement.scrollTop>=top.offsetHeight){
nav.style.cssText="position:fixed;top:0px;";
}else {
nav.style.cssText="position:static;";
myMain.style.marginTop ='0px';
}
}
}
</script>
</body>
</html>
图片占位