//布局格式
<div class="box">
  <span class="item"></span>
</div>

1.基础的左对齐:只需要父元素设置flex属性即可 排列由左往右排

.box {
  display: flex;
}

image.png

2.设置项目的对齐方式，就能实现居中对齐 justify-content 控制X轴方向的位置

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

image.png

3.设置项目的对齐方式，就能实现居右对起

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

image.png

4.设置交叉轴对齐方式，可以垂直移动主轴。

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

image.png

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

image.png

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

image.png

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

image.png

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

image.png

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

image.png

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

image.png

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

image.png

.box {
  display: flex;
}

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

image.png

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

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

image.png

.box {
  display: flex;
}

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

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

image.png

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

image.png

<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;
}

image.png

<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;
}

`