flex 布局记熟以下这张图，搞懂主轴与侧轴即可
flex布局html代码
<!DOCTYPE html>
<html lang="en">
<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>
* {
margin: 0;
padding: 0;
}
body,html {
display: flex;
flex-direction: column;
align-items: stretch;
width: 100%;
height: 100%;
background: #eee;
}
header {
flex-basis: 40px;
background: red;
}
main {
display: flex;
flex-grow: 1;
padding-bottom: 40px;
background: blue;
}
aside {
flex-basis: 250px;
margin-right: 20px;
background: yellow;
}
section {
flex-grow: 1;
background: black;
}
footer {
position: fixed;
bottom: 0;
left: 0;
right: 0;
height: 40px;
background: gray;
}
</style>
</head>
<body>
<header>顶部</header>
<main>
<aside>左侧</aside>
<section>右侧</section>
</main>
<footer>底部</footer>
</body>
</html>
- flex-direction 主轴方向，默认是横轴，可改为纵轴
- flex-basis 默认宽度/高度，由主轴方向决定是宽度还是高度
- flex-grow 伸度，有多的位置自动扩张
- flex-shrink 缩度，挤压时自动缩小空间
- align-items 内容在交叉轴上的对齐方式，默认stretch，自动拉伸至两端对齐
学会以上即可用来做简单的两栏布局了
