html代码： 

<div class="kongtiaojifang" ref="kongtiao" @mousedown="mouseDownHandleelse($event)" @mouseup="mouseUpHandleelse($event)">
</div>

js代码：

<script>
export default {
  name: 'zhinengjifang',
  data () {
    return {
      moveDataelse: {
        x: null,
        y: null
      }
    }
  },
  mounted () {
  },
  beforeDestroy () {
  },
  components: {
  },
  methods: {
    mouseDownHandleelse (event) {
      this.moveDataelse.x = event.pageX - this.$refs.kongtiao.offsetLeft
      this.moveDataelse.y = event.pageY - this.$refs.kongtiao.offsetTop
      event.currentTarget.style.cursor = 'move'
      window.onmousemove = this.mouseMoveHandleelse
    },
    mouseMoveHandleelse (event) {
      let moveLeft = event.pageX - this.moveDataelse.x + 'px'
      let moveTop = event.pageY - this.moveDataelse.y + 'px'
      this.$refs.kongtiao.style.left = moveLeft
      this.$refs.kongtiao.style.top = moveTop
    },
    mouseUpHandleelse (event) {
      window.onmousemove = null
      event.currentTarget.style.cursor = 'move'
      console.log('鼠标松开了')
    }
  }
}
</script>

 3、css代码：

<style scoped lang='scss'>
 .kongtiaojifang{
    height: 200px;
    width: 400px;
    position: fixed;
    left: 550px;
    cursor: pointer;
  }
</style>