"dependencies": {
  "element-ui": "^1.3.4",
  "less": "^2.7.2",
  "less-loader": "^4.0.4",
  "vue": "^2.3.3",
  "vue-router": "^2.3.1",
  "vuedraggable": "^2.11.0"
 },

import draggable from 'vuedraggable'

components: {
　　draggable
},

<draggable v-model="tags" :move="getdata" @update="datadragEnd">
    <transition-group>
      <div v-for="element in tags" :key="element.id">
        {{element.name}}
      </div>
    </transition-group>
</draggable>

 methods: {
   getdata (evt) {
    console.log(evt.draggedContext.element.id)
   },
   datadragEnd (evt) {
    console.log('拖动前的索引 :' + evt.oldIndex)
    console.log('拖动后的索引 :' + evt.newIndex)
    console.log(this.tags)
   }
  }