vue移动端 位置调换拖拽案列

<template>
  <transition-group tag="div" name="drag" class="box">
    <div
      v-for="(item, index) in list"
      :key="item"
      class="item"
      :draggable="true"
      @dragstart="dragStart($event, index)"
      @dragover="allowDrop"
      @drop="drop($event, index, list)"
    >
      {{ item }}
    </div>
  </transition-group>
</template>
<script>
export default {
  data() {
    return {
      list: [1, 2, 3, 4, 5, 6, 7, 8, 9]
    };
  },
  methods: {
    //取消默认行为
    allowDrop(e) {
      e.preventDefault();
    },
    //开始拖动
    dragStart(e, index) {
      e.dataTransfer.setData("index", index);
    },
    //放置
    drop(e, index, data) {
      this.allowDrop(e);
      const dragIndex = e.dataTransfer.getData("index");
      const temp = data.splice(dragIndex, 1);
      data.splice(index, 0, temp[0]);
    }
  }
};
</script>
<style scoped>
.box {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  width: 330px;
  margin: 0 auto;
}
.item {
  width: 100px;
  height: 100px;
  border: 1px solid #ccc;
  margin-bottom: 10px;
  line-height: 100px;
  text-align: center;
}
.drag-move {
  transition: transform 1s;
}
</style>