CSS | CSS实现两栏布局（左边定宽右边自适应，左右成比自适应）_css布局左右布局自适应左侧高度根据右侧内容自适应右侧区域再左右布局-优快云博客

一、左边定宽右边自适应

1.浮动

2.利用浮动+margin

三列布局链接：CSS | 实现三列布局（两边边定宽中间自适应，自适应成比）-优快云博客

<div class="father">
      <div class="left">左边自适应</div>
      <div class="right">右边自适应</div>
    </div>

一、左边定宽右边自适应

实现效果：

1.浮动

.left {
  width: 100px;
  background-color: rebeccapurple;
  float: left;
}
.right {
  width: calc(100%-100px);
  background-color: green;
}

2.利用浮动+margin

.left {
  width: 100px;
  background-color: rebeccapurple;
  float: left;
}

.right {
  background-color: green;
  margin-left: 100px;
}

3.定位+margin

.father {
  position: relative;
}

.left {
  position: absolute;
  width: 100px;
  left: 0;
  background-color: rebeccapurple;
}

.right {
  background-color: green;
  margin-left: 100px;
}

4.flex布局

.father {
  display: flex;
}

.left {
  width: 100px;
  background-color: rebeccapurple;
}

.right {
  flex: 1;
  /* flex: 1可以让其填充剩余的空间，以达到拉伸的效果 */
  background-color: green;
}

5.table 布局

.father {
  width: 100%;
  display: table;
}

.left {
  display: table-cell;
  width:300px;
  background-color: rebeccapurple;
}

.right {
  display: table-cell;
  background-color: green;
}

二、左右成比自适应

1:1

1flex布局

.father {
  display: flex;
}
.left {
  width: 200px;
  height: 200px;
  background-color: rebeccapurple;
  flex: 1;
  }
.right {
  width: 200px;
  height: 200px;
  background-color: green;
  flex: 1;
 /* 放大且缩小并等分所有空间 */
 /* flex：1等于flex-grow: 1、flex-shrink: 1、flex-basic: 0% */
}

table布局

.father {
  width: 100%;
  display: table;
}

.left {
  display: table-cell;
  height: 200px;
  background-color: rebeccapurple;
}

.right {
  display: table-cell;
  height: 200px;
  background-color: green;
}

1:2

flex布局

.father {
  display: flex;
}
.left {
  width: 200px;
  height: 200px;
  background-color: rebeccapurple;
  flex: 1;
}
.right {
  width: 200px;
  height: 200px;
  background-color: green;
  flex: 2;
 /* flex：1等于flex-grow: 2、flex-shrink: 2、flex-basic: 0% */
  
}

等分所有空间，宽度比左：右=1:2

flex 布局的默认主轴方向为 row ，所以 flex-basis 属性默认是控制元素的 width