VUE实现可随意拖动的弹窗组件

<template>
 <el-container v-bind:id="id"
        v-if="dialogVisible">
  <el-header>
   <div @mousedown="mousedown">
    <h2 v-html="title"></h2>
    <div @click.stop="closeDialog()" style="position: absolute;top: 0px; right: 20px;">
    <span>
     <svg class="icon" aria-hidden="false">
      <use xlink:href='#el-icon-ext-close'></use>
     </svg>
    </span>
    </div>
   </div>
  </el-header>
  <el-main>
   <slot>这里是内容</slot>
  </el-main>
  <el-footer>
   <span class="dialog-footer">
    <el-button @click="closeDialog">取 消</el-button>
    <el-button type="primary" @click="closeDialog">确 定</el-button>
   </span>
  </el-footer>
 </el-container>
</template>

<script>
 export default {
  name: 'Window',
  props: {
   titlex: String,
   id: [String, Number]
  },
  data() {
   return {
    title: '标题',
    selectElement: ''
   }
  },
  computed: {
   dialogVisible: {
    get: function () {
     return this.$store.state.dialogVisible
    },
    set: function (newValue) {
     this.$store.commit('newDialogVisible', newValue)
    }
   }
  },
  methods: {
   closeDialog(e) {
    this.dialogVisible = false
    // alert(this.dialogVisible)
    this.$store.commit('newDialogVisible', false)
   },
   mousedown(event) {
    this.selectElement = document.getElementById(this.id)
    var div1 = this.selectElement
    this.selectElement.style.cursor = 'move'
    this.isDowm = true
    var distanceX = event.clientX - this.selectElement.offsetLeft
    var distanceY = event.clientY - this.selectElement.offsetTop
    // alert(distanceX)
    // alert(distanceY)
    console.log(distanceX)
    console.log(distanceY)
    document.onmousemove = function (ev) {
     var oevent = ev || event
     div1.style.left = oevent.clientX - distanceX + 'px'
     div1.style.top = oevent.clientY - distanceY + 'px'
    }
    document.onmouseup = function () {
     document.onmousemove = null
     document.onmouseup = null
     div1.style.cursor = 'default'
    }
   }
  }
 }
</script>

<style scoped>
 .el-container {
  position: absolute;
  height: 500px;
  width: 500px;
  border: 1px;
  top: 20%;
  left: 35%;
  border-radius: 2px;
 }

 .dialog-footer {
  text-align: right;
 }

 .el-main {
  background-color: white;
 }

 .el-footer {
  background-color: white;
 }

 .el-header {
  background-color: white;
  color: #333;
  line-height: 60px;
 }

 .el-aside {
  color: #333;
 }
</style>