共计 1275 个字符，预计需要花费 4 分钟才能阅读完成。
废话不多说，间接上代码：
1、上中下布局：<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
body {
position: absolute;
left: 0; right: 0; top: 0; bottom: 0;
padding: 0; margin: 0;
display: flex;
flex-direction: column;
}
.header, .footer {height: 50px;}
.body {
flex-grow: 1;
background-color: #DDD;
}
</style>
</head>
<body>
<div class="header">Header</div>
<div class="body">Content</div>
<div class="footer">Footer</div>
</body>
</html>
显示成果如下：
2、左右布局：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
body {
position: absolute;
left: 0; right: 0; top: 0; bottom: 0;
padding: 0; margin: 0;
display: flex;
}
.left, .right {height: 100%;}
.left {
width: 250px;
background-color: rgba(255,0,0,0.3);
}
.right {
display: flex;
flex-direction: column;
}
.header, .footer {height: 50px;}
.right, .content {flex-grow: 1;}
.content {background-color: #DDD;}
</style>
</head>
<body>
<div class="left">LeftNav</div>
<div class="right">
<div class="header">Header</div>
<div class="content">Content</div>
<div class="footer">Footer</div>
</div>
</body>
</html>
页面的成果如下：
上面对几个要害的款式加以阐明，这样就能够设计出任何想要的布局了：
flex-grow: 1; // 示意容器在主轴的宽度有多余时该子项占据残余空间
position：absolute; left: 0;right: 0; top: 0; bottom: 0; // 这一组款式让该元素占满定位的父级元素 正文完