实现效果
准备html
vscode可利用快捷输入 header>a+ul>li*3>a+tab
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<header>
<a href="#" class="logo">Logo</a>
<ul>
<li><a href="#">Home</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Contact</a></li>
</ul>
</header>
<section class="banner"></section>
<script type="text/javascript">
window.addEventListener("scroll",function(){
let header = document.querySelector("header");
header.classList.toggle("sticky",window.scrollY>0)
})
</script>
</body>
</html>
准备css
*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
body{
background-color: #000;
min-height: 200vh;
}
header{
position: fixed;
top: 0;
left: 0;
width: 100%;
display: flex;
justify-content: space-between;
align-items: center;
transition: .6s;
padding: 40px 100px;
z-index: 99;
}
header.sticky{
padding: 5px 100px;
background: #fff;
}
header.sticky .logo,
header.sticky ul li a{
color: #000;
}
header .logo{
position: relative;
font-weight: 700;
color: #fff;
text-decoration: none;
font-size: 2em;
text-transform: uppercase;
letter-spacing: 2px;
transition: .6s;
}
header ul{
position: relative;
display: flex;
justify-content: center;
align-items: center;
}
header ul li{
position: relative;
list-style: none;
}
header ul li a{
position: relative;
margin: 0 15px;
text-decoration: none;
color: #fff;
letter-spacing: 2px;
font-weight: 500px;
transition: .6s;
}
.banner{
position: relative;
width: 100%;
height: 100vh;
background: url("bg.png");
background-size: cover;
}