npm install vuedraggable -S

import draggable from 'vuedraggable'

components: {
    draggable
},

<template>
    <draggable v-model="colors" @update="datadragEnd" :options = "{animation:500}">
            <transition-group>
                <div v-for="element in colors" :key="element.text" class = "drag-item">
                    {{element.text}}
                </div>
            </transition-group>
    </draggable>
</template>

<script>
    import draggable from 'vuedraggable'
    export default{
        data(){
            return{
                msg:"这是测试组件",
                colors: [
                    {
                        text: "Aquamarine",
                    }, 
                    {
                        text: "Hotpink",
                    }, 
                    {
                        text: "Gold",
                    }, 
                    {
                        text: "Crimson",
                    }, 
                    {
                        text: "Blueviolet",
                    },
                    {
                        text: "Lightblue",
                    }, 
                    {
                        text: "Cornflowerblue",
                    }, 
                    {
                        text: "Skyblue",
                    }, 
                    {
                        text: "Burlywood",
                    }
                ],
                startArr:[],
                endArr:[],
                count:0,
            }
        },
        components: {
        　　draggable
        },
        methods:{
            getdata (evt) {
                console.log(evt.draggedContext.element.text)
            },
            datadragEnd (evt) {
                evt.preventDefault();
                console.log('拖动前的索引 :' + evt.oldIndex)
                console.log('拖动后的索引 :' + evt.newIndex)
                console.log(this.colors);
            }
        },
        mounted () {
            //为了防止火狐浏览器拖拽的时候以新标签打开，此代码真实有效
            document.body.ondrop = function (event) {
                event.preventDefault();
                event.stopPropagation();
            }
        }
    }
</script>

<style lang="scss" scoped>
    .test{
        border:1px solid #ccc;
    }
    .drag-item{
        width: 200px;
        height: 50px;
        line-height: 50px;
        margin: auto;
        position: relative;
        background: #ddd;
        margin-top:20px;
    }
    .ghostClass{
        opacity: 1;
    }
    .bottom{
        width: 200px;
        height: 50px;
        position: relative;
        background: blue;
        top:2px;
        left: 2px;
        transition: all .5s linear;
    }
</style>

<transition-group tag="div" class="container">
  <div class="item" v-for="(item,index) in items" :key="item.key" :style="{background:item.color,width:'80px',height:'80px'}"
    draggable="true"
  @dragstart="handleDragStart($event, item)"
    @dragover.prevent="handleDragOver($event, item)"
    @dragenter="handleDragEnter($event, item)"
    @dragend="handleDragEnd($event, item)" >
  </div>
</transition-group>

<script>
export default {
 name: 'Toolbar',
 data () {
  return {
   items: [
    { key: 1, color: '#ffebcc'},
    { key: 2, color: '#ffb86c'},
    { key: 3, color: '#f01b2d'}
   ],
     
    dragging: null
  }
 },
 methods:{
  handleDragStart(e,item){
    this.dragging = item;
  },
  handleDragEnd(e,item){
    this.dragging = null
  },
  //首先把div变成可以放置的元素，即重写dragenter/dragover
  handleDragOver(e) {
    e.dataTransfer.dropEffect = 'move'// e.dataTransfer.dropEffect="move";//在dragenter中针对放置目标来设置!
  },
  handleDragEnter(e,item){
    e.dataTransfer.effectAllowed = "move"//为需要移动的元素设置dragstart事件
    if(item === this.dragging){
      return
    }
    const newItems = [...this.items]
    console.log(newItems)
    const src = newItems.indexOf(this.dragging)
    const dst = newItems.indexOf(item)
  
    newItems.splice(dst, 0, ...newItems.splice(src, 1))
  
    this.items = newItems
  }
 }
}
</script>
  
<style scoped>
  .container{
    width: 80px;
    height: 300px;
    position: absolute;
    left: 0;
    display:flex;
    flex-direction: column;
    padding: 0;
  }
  .item {
   margin-top: 10px;
   transition: all linear .3s
  }