方法1：使用flex
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Document</title>
<style>
.con {
display: flex;
}
.left {
background-color: red;
width: 200px;
height: 50px;
}
.middle {
background-color: green;
height: 50px;
flex: 1;
}
.right {
background-color: blue;
width: 200px;
height: 50px;
}
</style>
</head>
<body>
<div class="con">
<div class="left"></div>
<div class="middle"></div>
<div class="right"></div>
</div>
</body>
</html>
方法2：使用float + margin
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Document</title>
<style>
.left {
background-color: red;
width: 200px;
height: 50px;
float: left;
}
.middle {
background-color: green;
height: 50px;
margin: 0 200px;
}
.right {
background-color: blue;
width: 200px;
height: 50px;
float: right;
}
</style>
</head>
<body>
<div class="con">
<div class="left"></div>
<div class="right"></div>
<!-- 注意这里，中间的内容要放在下边 -->
<div class="middle"></div>
</div>
</body>
</html>
或者也可以对left和right的div进行绝对定位
方法3：使用float + BFC
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Document</title>
<style>
.left {
background-color: red;
width: 200px;
height: 50px;
float: left;
}
.middle {
background-color: green;
height: 50px;
/* 这一行做了变化 */
overflow: hidden;
}
.right {
background-color: blue;
width: 200px;
height: 50px;
float: right;
}
</style>
</head>
<body>
<div class="con">
<div class="left"></div>
<div class="right"></div>
<!-- 中间的内容要放在下边 -->
<div class="middle"></div>
</div>
</body>
</html>
方法4：圣杯布局和双飞翼布局
https://blog.csdn.net/weixin_43974265/article/details/115427185
方法5：绝对定位
全部使用绝对定位
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Document</title>
<style>
.con {
position: relative;
}
.left {
background-color: red;
width: 200px;
height: 50px;
position: absolute;
left: 0;
}
.middle {
background-color: green;
height: 50px;
position: absolute;
left: 200px;
right: 200px;
}
.right {
background-color: blue;
width: 200px;
height: 50px;
position: absolute;
right: 0;
}
</style>
</head>
<body>
<div class="con">
<div class="left"></div>
<div class="middle"></div>
<div class="right"></div>
</div>
</body>
</html>
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