media query
示例
<!DOCTYPE html>
<html lang="zh-Hans">
<head>
<meta charset="UTF-8">
<title>移动页面demo</title>
<style>
* {
margin: 0;
padding: 0;
}
a {
text-decoration: none;
}
ul, ol {
list-style: none;
}
.logo {
width: 60px;
height: 60px;
background: grey;
border-radius: 30px;
}
.clearfix::after {
content: '';
display: block;
clear: both;
}
.nav > li {
float: left;
}
.nav {
display: none;
background: grey;
margin-top: 10px;
}
.nav.active {
display: flex;/*flex不用clearfix*/
justify-content: space-between;
}
header > button {
position: absolute;
right: 20px;
top: 26px;
}
.nav2 {
display: none;
}
@media (min-width: 451px) {
header > button {
display: none;
}
.nav, .nav.active {
display: none;
}
.nav2{
display: block;
}
header {
display: flex;
align-items: center;
}
header .nav2{
display: flex;
margin-left: 20px;
}
header .nav2 > li {
margin: 0 10px;
}
}
</style>
</head>
<body>
<header>
<div class="logo"></div>
<button id=xx>菜单</button>
<ul id=yy class="nav">
<li><a href="#">导航1</a></li>
<li><a href="#">导航2</a></li>
<li><a href="#">导航3</a></li>
<li><a href="#">导航4</a></li>
<li><a href="#">导航5</a></li>
</ul>
<ul class="nav2">
<li><a href="#">导航1</a></li>
<li><a href="#">导航2</a></li>
<li><a href="#">导航3</a></li>
<li><a href="#">导航4</a></li>
<li><a href="#">导航5</a></li>
</ul>
</header>
<script>
xx.onclick = function() {
yy.classList.toggle('active')
}
</script>
</body>
</html>
手机端禁止缩放要加meta标签
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
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