一、前言：

本文讲解了在vue2、vue3中使用VueDraggable，和使用遇到的问题

二、Vue.Draggable简介

Vue.Draggable 是一款基于 Sortable.js 实现的vue拖拽插件。支持移动设备、拖拽和选择文本、智能滚动，可以在不同列表间拖拽、不依赖 jQuery 为基础、vue2 过渡动画兼容、支持撤销操作，总之是一款非常优秀的vue拖拽组件。

三、效果图

四、相关链接

效果图链接：https://sortablejs.github.io/Vue.Draggable/#/two-list-headerslots
Vue.Draggable中文官方链接：https://github.com/SortableJS/vue.draggable.next

五、vue2中使用Vue.Draggable

1、vue2安装插件

yarn add vuedraggable

npm i -S vuedraggable

2、vue文件

<template>
  <div class="twoPage"> 
  	<!--
          :clone 自定义赋值的方法
          :group="{ name: 'people', pull: 'clone', put: false }"：表示可拖拽克隆出去，但不接收外面拖拽过来的
          group="people"：简单的内部拖拽
          @start="dragging = true":拖拽克隆后删除,  false 克隆到另一个面板不删除
          @end="dragging = true":拖拽结束后的事件
        -->
    <draggable  :list="list" :disabled="!enabled" class="list-group" ghost-class="ghost"
        :move="checkMove" @start="dragging = true" @end="dragging = false">
        <div class="list-group-item" v-for="element in list" :key="element.name">
          {{ element.name }}
        </div>
      </draggable>
  </div>
</template>
<script>
import draggable from "vuedraggable";
export default {
  data() {
    return {
      enabled: true,
      list: [
        { name: "1 - John", id: 0 },
        { name: "2 - Joao", id: 1 },
        { name: "3 - Jean", id: 2 }
      ],
      dragging: false
    };
  },
  components:{
    draggable
  },
  mounted() {
  },
  methods: {
    checkMove: function(e) {
      window.console.log("Future index: " + e.draggedContext.futureIndex);
    }
  }
};
</script>
<style lang="less">
.ghost {
  opacity: 0.5;
  background: #c8ebfb;
}
.list-group{
  display: flex;
  flex-direction: column;
  padding-left: 0;
  margin-bottom: 0;
  width: 300px;
  .list-group-item{
    cursor: move;
    position: relative;
    display: block;
    padding: 0.75rem 1.25rem;
    margin-bottom: -1px;
    background-color: #fff;
    border: 1px solid rgba(0,0,0,.125);
  }
}
</style>

六、vue3中使用Vue.Draggable

1、安装插件

yarn add vuedraggable@next

npm i -S vuedraggable@next

2 .vue文件

<template>
  <div class="twoPage">
    <div class="el-row">
      <div class="el-col" :span="12">
        <h3>Draggable 1</h3>
        <!--
          :clone 自定义赋值的方法
          :group="{ name: 'people', pull: 'clone', put: false }"：表示可拖拽克隆出去，但不接收外面拖拽过来的
          group="people"：简单的内部拖拽
          @start="dragging = true":拖拽克隆后删除,  false 克隆到另一个面板不删除
          @end="dragging = true":拖拽结束后的事件
        -->
        <draggable
          class="list-group"
          :list="list1"
          @change="log"
          @start="dragging = true"
        >
          <template #item="{ element }">
            <div class="list-group-item">{{ element.name }} {{ index }}</div>
          </template>
        </draggable>
      </div>

      <div class="el-col" :span="12">
        <h3>Draggable 2</h3>
        <draggable
          class="list-group"
          :group="{ name: 'people', pull: 'clone', put: true }"
          :list="list2"
          @change="log"
        >
          <template #item="{ element }">
            <div class="list-group-item">{{ element.name }} {{ index }}</div>
          </template>
        </draggable>
      </div>
    </div>
  </div>
</template>
<script>
  import draggable from 'vuedraggable'
  export default {
    components: {
      draggable,
    },
    data() {
      return {
        enabled: true,
        list1: [
          { name: '1 - John', id: 0 },
          { name: '2 - Joao', id: 1 },
          { name: '3 - Jean', id: 2 },
        ],
        list2: [
          { name: 'list2 - 1:Juan', id: 5 },
          { name: 'list2 - 2:Edgard', id: 6 },
          { name: 'list2 - 3:Johnson', id: 7 },
        ],
        dragging: false,
      }
    },
    mounted() {},
    methods: {
      checkMove: function (e) {
        window.console.log('Future index: ' + e.draggedContext.futureIndex)
      },
      log: function (evt) {
        window.console.log(evt)
      },
      cloneDog({ id }) {
        return {
          id: 8,
          name: 'cat',
        }
      },
    },
  }
</script>
<style lang="scss">
  .ghost {
    opacity: 0.5;
    background: #c8ebfb;
  }
  .list-group {
    display: flex;
    flex-direction: column;
    padding-left: 0;
    margin-bottom: 0;
    width: 300px;
    .list-group-item {
      cursor: move;
      position: relative;
      display: block;
      padding: 0.75rem 1.25rem;
      margin-bottom: -1px;
      background-color: #fff;
      border: 1px solid rgba(0, 0, 0, 0.125);
    }
  }
</style>

七、遇到的问题：‘id’ is defined but never used (no-unused-vars）eslint规范问题

.eslintrc.js文件中添加         "no-unused-vars": 'off'