VUE实现可随意拖动的弹窗组件

背景：项目需要，我们引入了前端框架就是目前最流行的框架之一vue,同时引入了一套由饿了吗维护的ui库，由于我们是在pc端使用发现它竟然没有提供可随意拖动的窗口，可能用的更多的时移动端吧吧，于是就随手写了一个，比较简单吧，但是做过的就会知道也是有一些小小的技巧，记录下吧留作备用。

由于不是很难，就不做过多解释了，直接上代码：

<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>