012：vue结合纯CSS实现蛇形流程图/步骤条

1. 实现效果

2. 实现代码

<template>
  <div class="container">
    <div v-for="(item, index) in list" class="grid-item">
      <div class="step">step{{index+1}}</div>
    </div>
  </div>
</template>

<script setup>
  import { ref } from 'vue';

const list = ref(new Array(11).fill(''));
</script>

<style lang="less">
  /** 可配置的参数 可以调整试试 */
  @colNum: 4; // 单行排列的步骤 试试 2、3、4、5、6
  @colEven: @colNum * 2; // 两行元素数
  @lineWidth: 26px; // 步骤间连线长度
  @rowDistance: 40px; // 行间距
  @colDistance: @lineWidth; // 列间距
  @arrowSize: 6px; // 箭头大小
  @stepColor: #cfbbfd; // 步骤颜色

  .container {
    margin-top:100px;
    display: grid;
    grid-template-columns: repeat(@colNum, 1fr);
    gap: @rowDistance @colDistance;
    padding-top: @rowDistance;
  }

  .grid-item {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;

    &::before {
      position: absolute;
      content: '';
      right: -@lineWidth;
      width: @lineWidth;
      height: 0;
      border-top: 1px dashed @stepColor;
    }

    &::after {
      content: '';
      position: absolute;
      right: (-@colDistance / 2);
      transform: translateX(50%);
      border-top: (@arrowSize / 1.4) solid transparent;
      border-left: @arrowSize solid @stepColor;
      border-bottom: (@arrowSize / 1.4) solid transparent;
    }

    // 给每行最后一个步骤（除最后一行）添加向下的连接箭头
    &:nth-child(@{colNum}n) {

      &:not(:last-child) {
        .step {
          &::before {
            content: '';
            position: absolute;
            left: 50%;
            bottom: -(@rowDistance / 2);
            height: @lineWidth;
            border-left: 1px dashed @stepColor;
            transform: translate(-50%, 50%);
          }

          &::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: -(@rowDistance / 2);
            border-top: @arrowSize solid @stepColor;
            border-left: (@arrowSize / 1.4) solid transparent;
            border-right: (@arrowSize / 1.4) solid transparent;
            transform: translate(-50%, 50%);
          }
        }
      }
    }

    each(range(@colEven), {
        &:nth-child(@{colEven}n+@{value}) {
          @isEvenLine: boolean(@value > @colNum);
          @modNum: mod(@value, @colEven); // 余数 1、2、3、4、5、0
          color: if(@isEvenLine, #7dbcf7, #f38cd6);

          /** 偶数行旋转箭头，步骤倒序排列（使用transform交换位置） */
          & when (@isEvenLine) {
            @transN: (@colNum + 1 + @colEven - @value - @value);
            transform: translateX(calc(@transN * 100% + @transN * @colDistance));

            &::after {
              transform: translateX(50%) rotate(180deg) !important; // 旋转箭头
            }
          }

          // 最右排(n & n + 1 位)隐藏多余的箭头（如果container设置了overflow:hidden 则不用处理）
          & when (@modNum=@colNum), (@modNum=@colNum+1) {
            &::before, &::after {
              display: none;
            }
          }

          // 最后一个步骤在奇数行 需要隐藏连线箭头
          & when not (@isEvenLine) {
            &:last-child {
              &::before, &::after {
                display: none;
              }
            }
          }

        }
      }

    )
  }

  .step {
    position: relative;
    width: 100px;
    line-height: 30px;
    font-size: 16px;
    text-align: center;
    border: 1px solid @stepColor;
    border-radius: 4px;
  }
</style>