效果图 上移 下移 首先想到的是 数组的相互替换嘛

<template>
  <div>
    <div class="box" v-for="(item,index) in arr" :key="index">
      {{item.cnName}}
      <div class="upDownWrapper">
        <span class="up" @click="upClick(index)" v-if="index !== 0">上移</span>
        <span class="down" @click="downClick(index)" v-if="index !== arr.length - 1">下移</span>
      </div>
    </div>
  </div>
</template>

export default {
  data() {
    return {
      arr: [
        {
          cnName: "第一"
        },
        {
          cnName: "第二"
        },
        {
          cnName: "第三"
        },
        {
          cnName: "第四"
        }
      ]
    };
  }
};

主要方法是

  methods: {
    // 上移
    upClick(index) {
      console.log('upClick',index);
      let newArr = this.swapItems(this.arr, index, index - 1)
      this.arr = newArr
    },
    // 下移
    downClick(index) {
      console.log('downClick',index);
      let newArr = this.swapItems(this.arr, index, index + 1)
      this.arr = newArr
    },
    // 上下移动的核心
    swapItems(arr, index1, index2) {
      arr[index1] = arr.splice(index2, 1, arr[index1])[0];
      return arr;
    }

  }
12-29 20:16