话不多说先上要实现的效果：（很简单水平居中）
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>左右固定中间自适应</title>
</head>
<style type="text/css">
* {
margin: 0;
padding: 0;
list-style: none;
}
/* 方式一:浮动 */
.box{
height: 200px;
background: #000000;
}
.left{
width: 100px;
height: 100%;
background: #21759B;
float: left;
}
.main{
margin: 0 100px;
height: 100%;
background: #ccc;
}
.right{
width: 100px;
height: 100%;
background: #21759B;
float: right;
}
</style>
<body>
<div class="box">
<p style="color:#fff">Tip：html方面，必须中间在最后，不然右边就会挤下来【dom的渲染机制的问题】</p>
<div class="right">右边固定</div>
<div class="left">左边固定</div>
<div class="main">中间自适应</div>
</div>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>左右固定中间自适应</title>
</head>
<style type="text/css">
* {
margin: 0;
padding: 0;
list-style: none;
}
/* 方式二:定位 */
.box{
background: #000000;
position: relative;
}
.left{
width: 100px;
height: 100%;
background: #21759B;
position: absolute;
top: 0;
left: 0;
}
.main{
margin: 0 100px;
height: 200px;
background: #ccc;
}
.right{
width: 100px;
height: 100%;
background: #21759B;
position: absolute;
top: 0;
right: 0;
}
</style>
<body>
<div class="box">
<div class="left">左边固定</div>
<div class="main">中间自适应</div>
<div class="right">右边固定</div>
</div>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>左右固定中间自适应</title>
</head>
<style type="text/css">
* {
margin: 0;
padding: 0;
list-style: none;
}
/* 方式三:flex */
.box{
display: flex;
height: 200px;
background: #000000;
}
.left{
width: 100px;
height: 100%;
background: #21759B;
}
.main{
flex: 1;
height: 100%;
background: #ccc;
}
.right{
width: 100px;
height: 100%;
background: #21759B;
}
</style>
<body>
<div class="box">
<div class="left">左边固定</div>
<div class="main">中间自适应</div>
<div class="right">右边固定</div>
</div>
</body>
</html>
