题目
假设高度已知，请写出三栏布局，其中左栏、右栏宽度各为300px，中间自适应。
解答
1.浮动布局；
2.绝对定位；
3.flexbox解决；
4.table-cell表格布局；
5.grid网格布局。
代码实现
<!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>
html *{
padding: 0;
margin: 0;
}
.layout{
margin-top:20px;
}
.layout article div{
min-height: 100px;
}
</style>
</head>
<body>
<section class="layout float">
<style media="screen">
.layout.float .left{
float: left;
width:300px;
background: red;
}
.layout.float .right{
float: right;
width:300px;
background:green;
}
.layout.float .center{
background:yellow;
}
</style>
<article class="left-right-center">
<div class="left"></div>
<div class="right"></div>
<div class="center">
<h1>浮动解决方案</h1>
</div>
</article>
</section>
<section class="layout absolute">
<style>
.layout.absolute .left-center-right>div{
position: absolute;
}
.layout.layout.absolute .left{
left:0;
width: 300px;
background: red;
}
.layout.absolute .center{
left:300px;
right:300px;
background:yellow;
}
.layout.absolute .right{
right:0;
width:300px;
background:green;
}
</style>
<article class="left-center-right">
<div class="left"></div>
<div class="center">
<h1>绝对定位解决</h1>
</div>
<div class="right"></div>
</article>
</section>
<section class="layout flexbox">
<style>
.layout.flexbox{
margin-top: 140px;
}
.layout.flexbox .left-center-right{
display:flex;
}
.layout.flexbox .left{
width:300px;
background: red;
}
.layout.flexbox .center{
flex:1;
background:yellow;
}
.layout.flexbox .right{
width:300px;
background:green;
}
</style>
<article class="left-center-right">
<div class="left"></div>
<div class="center">
<h1>flexbox解决方案</h1>
</div>
<div class="right"></div>
</article>
</section>
<section class="layout table">
<style>
.layout.table .left-center-right{
width: 100%;
display: table;
height: 100px;
}
.layout.table .left-center-right>div{
display: table-cell;
}
.layout.table .left{
width:300px;
background: red;
}
.layout.table .center{
background: yellow;
}
.layout.table .right{
width:300px;
background:green;
}
</style>
<article class="left-center-right">
<div class="left"></div>
<div class="center">
<h1>表格布局</h1>
</div>
<div class="right"></div>
</article>
</section>
<section class="layout grid">
<style media="screen">
.layout.grid .left-center-right{
display: grid;
width:100%;
grid-template-rows: 100px;
grid-template-columns: 300px auto 300px;
}
.layout.grid .left{
background:red;
}
.layout.grid .center{
background:yellow;
}
.layout.grid .right{
background: green;
}
</style>
<article class="left-center-right">
<div class="left"></div>
<div class="center">
<h1>网格布局</h1>
</div>
<div class="right"></div>
</article>
</section>
</body>
</html>
