<!DOCTYPE html>
<html lang="zh-cn">
<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>Document</title>
<style>
*{
padding: 0;
margin: 0;
}
#dv1{
width: 100%;
height: 500px;
background: red;
}
#uu{
width: 100%;
height: 100px;
background: blueviolet;
display: flex;
}
#uu li{
width: 20%;
height: 100px;
background: fuchsia;
border: 2px solid blue;
text-align: center;
line-height: 100px;
font-size: 20px;
list-style: none;
/* display: flex;
flex-wrap: nowrap; */
}
#dv2{
width: 100%;
height: 1500px;
background: chartreuse;
}
.fixed{
position: fixed;
top: 0;
left: 0;
}
</style>
</head>
<body>
<div id="dv1"></div>
<ul id="uu" class="uu1">
<li>新闻</li>
<li>娱乐</li>
<li>财经</li>
<li>军事</li>
<li>国际</li>
</ul>
<div id="dv2">
<img src="img/wenshen.jpg" alt="" width="100%" height="1500px ">
</div>
<script src="common.js"></script>
<script>
function feng() {
return {
top: window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0,
left: window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft || 0
}
}
window.onscroll = function(){
if(feng().top >= my$('dv1').offsetHeight){
my$('uu').className = 'uu1 fixed';
//my$('dv2').style.marginTop = my$('dv1').offsetHeight + 10 +'px';
}
else{
my$('uu').className = 'uu1';
my$('dv2').style.marginTop = '10px';
}
}
</script>
</body>
</html>
