用三种方法实现两列布局，左边固定宽度，右边自适应剩余的宽度。
1. flex 方式
<!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>
.box {
height: 200px;
display: flex;
}
.left {
background-color: red;
height: 100%;
width: 200px;
}
.content {
background-color: yellow;
height: 100%;
flex: 1;
}
</style>
</head>
<body>
<div class="box">
<div class="left"></div>
<div class="content"></div>
</div>
</body>
</html>
2. 绝对定位方式
<style>
.box {
height: 200px;
position: relative;
}
.left {
background-color: red;
height: 100%;
width: 200px;
position: absolute;
left: 0;
}
.content {
background-color: yellow;
height: 100%;
margin-left: 200px;
}
</style>
3. 浮动方式
<style>
.box {
height: 200px;
position: relative;
}
.left {
background-color: red;
height: 100%;
width: 200px;
float: left;
}
.content {
background-color: yellow;
height: 100%;
margin-left: 200px;
}
</style>
CSS 实现三栏布局,左右固定，中间自适应。
1. flex 方式
<!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>
.box {
height: 200px;
display: flex;
}
.left {
width: 200px;
background-color: red;
height: 100%;
}
.content {
background-color: yellow;
flex: 1;
}
.right {
width: 200px;
background-color: green;
}
</style>
</head>
<body>
<div class="box">
<div class="left"></div>
<div class="content"></div>
<div class="right"></div>
</div>
</body>
</html>
2. 绝对定位方式
<style>
.box {
position: relative;
height: 200px;
}
.left {
width: 200px;
background-color: red;
left: 0;
height: 100%;
position: absolute;
}
.content {
background-color: yellow;
left: 200px;
right: 200px;
height: 100%;
position: absolute;
}
.right {
width: 200px;
background-color: green;
right: 0;
height: 100%;
position: absolute;
}
</style>
3. 浮动方式
<style>
.box {
height: 200px;
}
.left {
width: 200px;
background-color: red;
float: left;
height: 100%;
}
.content {
background-color: yellow;
height: 100%;
}
.right {
width: 200px;
background-color: green;
float: right;
height: 100%;
}
</style>
让一个div垂直居中。
宽度和高度已知的
<!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>
.box {
width: 400px;
height: 200px;
position: relative;
background: red;
}
.content {
width: 200px;
height: 100px;
position: absolute;
top: 50%;
left: 50%;
margin-left: -100px;
margin-top: -50px;
background: green;
}
</style>
</head>
<body>
<div class="box">
<div class="content"></div>
</div>
</body>
</html>
宽度和高度未知的
<style>
.box {
width: 400px;
height: 200px;
position: relative;
background: red;
}
.content {
width: 200px;
height: 100px;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
background: green;
}
</style>
flex 方式
<style>
.box {
width: 400px;
height: 200px;
background: red;
display: flex;
justify-content: center;
align-items: center;
}
.content {
width: 200px;
height: 100px;
background: green;
}
</style>
