圣杯布局的实现方式
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1.什么是圣杯布局？
左右盒子固定，中间盒子自适应
2.实现方式
（1）flex布局
思路：左右盒子给固定的宽高，中间盒子flex:1
<!DOCTYPE html>
<html lang="en"><head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<style>
*
margin: 0;
padding: 0;
.box
display: flex;
width: 100vw;
height: 100vh;
.one
width: 20vw;
height: 20vh;
background-color: yellowgreen;
.two
flex: 1;
height: 20vh;
background-color: plum;
.three
width: 20vw;
height: 20vh;
background-color: pink;
</style>
<body>
<div class="box">
<div class="one">盒子1</div>
<div class="two">盒子2</div>
<div class="three">盒子3</div>
</div></body>
</html>
（2）浮动
思路：左盒子左浮，右盒子右浮，中间盒子不动，要注意布局顺序，盒子3在盒子2前面
<!DOCTYPE html>
<html lang="en"><head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<style>
*
margin: 0;
padding: 0;
.box
width: 100vw;
height: 100vh;
.one
float: left;
width: 20vw;
height: 20vh;
background-color: yellowgreen;
.two
height: 20vh;
background-color: yellow;
.three
float: right;
width: 20vw;
height: 20vh;
background-color: pink;
</style><body>
<div class="box">
<div class="one">盒子1</div>
<div class="three">盒子3</div>
<div class="two">盒子2</div>
</div></body>
</html>
（3）定位
思路：父级相对定位、左右绝对定位，中间盒子不动
<!DOCTYPE html>
<html lang="en"><head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<style>
*
margin: 0;
padding: 0;
.box
position: relative;
width: 100vw;
height: 100vh;
.one
position: absolute;
top: 0;
left: 0;
width: 20vw;
height: 20vh;
background-color: yellowgreen;
.two
height: 20vh;
background-color: plum;
.three
position: absolute;
top: 0;
right: 0;
width: 20vw;
height: 20vh;
background-color: pink;
</style><body>
<div class="box">
<div class="one">盒子1</div>
<div class="two">盒子2</div>
<div class="three">盒子3</div>
</div>
</body></html>
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