flex几种布局你都知道吗？

一个骰子九个点，分别依次实现点所在的位置。

<div class="box">
  <span class="item"></span>
</div>
           

一、单项目对齐方式

1、

.box {
  display: flex;//默认首行居左对齐
}
           

 2、

.box {
  display: flex;
  justify-content: center;//居中对齐
}
           

3、

.box {
  display: flex;
  justify-content: flex-end;//居右对齐
}
           

4、

.box {
  display: flex;
  align-items: center;//以垂直移动主轴，垂直居中
}
           

5、

.box {
  display: flex;
  justify-content: center;
  align-items: center;
}
           

6、

.box {
  display: flex;
  justify-content: center;
  align-items: flex-end;
}
           

7、

.box {
  display: flex;
  justify-content: flex-end;
  align-items: flex-end;
}
           

二、双项目对齐方式

<div class="box">
  <span class="item"></span>
</div>
           

1、

.box {
  display: flex;
  justify-content: space-between;//两端对齐
}
           

 2、

.box {
  display: flex;
  flex-direction: column;//更改为列对齐方式
  justify-content: space-between;//两端对齐
}
           

3 、

.box {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
}
           

4、

.box {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-end;
}
           

5、

.box {
  display: flex;
}

.item:nth-child(2) {
  align-self: center;
}
           

6、

.box {
  display: flex;
  justify-content: space-between;
}

.item:nth-child(2) {
  align-self: flex-end;
}
           

三、三项目对齐方式

<div class="box">
  <span class="item"></span>
</div>
           

1、

.box {
  display: flex;
}

.item:nth-child(2) {
  align-self: center;
}

.item:nth-child(3) {
  align-self: flex-end;
}
           

四、四项目对齐方式

<div class="box">
  <span class="item"></span>
</div>
           

1、

.box {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-content: space-between;
}
           

 2、

<div class="box">
  <div class="column">
    <span class="item"></span>
    <span class="item"></span>
  </div>
  <div class="column">
    <span class="item"></span>
    <span class="item"></span>
  </div>
</div>
           

.box {
  display: flex;
  flex-wrap: wrap;
  align-content: space-between;
}

.column {
  flex-basis: 100%;
  display: flex;
  justify-content: space-between;
}
           

 五、六项目对齐方式

1、

.box {
  display: flex;
  flex-wrap: wrap;
  align-content: space-between;
}
           

2、

.box {
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  align-content: space-between;
}
           

 3、

<div class="box">
  <div class="row">
    <span class="item"></span>
    <span class="item"></span>
    <span class="item"></span>
  </div>
  <div class="row">
    <span class="item"></span>
  </div>
  <div class="row">
     <span class="item"></span>
     <span class="item"></span>
  </div>
</div>
           

.box {
  display: flex;
  flex-wrap: wrap;
}

.row{
  flex-basis: 100%;
  display:flex;
}

.row:nth-child(2){
  justify-content: center;
}

.row:nth-child(3){
  justify-content: space-between;
}
           

 六、九项目对齐方式

.box {
  display: flex;
  flex-wrap: wrap;
}
           

总结，用的较多的是前面几种项目对齐方式。