弹窗可以拖动位置，弹窗大小可以改变

<el-dialog title="气泡参数设置" :visible.sync="settingOnoff" center :modal="false" width="20%" v-dialogDrag custom-class="popupdialog">
</el-dialog>

import Vue from 'vue'

// v-dialogDrag: 弹窗拖拽
Vue.directive('dialogDrag', {
  bind (el, binding, vnode, oldVnode) {
    const dialogHeaderEl = el.querySelector('.el-dialog__header')
    const dragDom = el.querySelector('.el-dialog')
    dialogHeaderEl.style.cursor = 'move'

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null)
        
    dialogHeaderEl.onmousedown = (e) => {
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - dialogHeaderEl.offsetLeft
      const disY = e.clientY - dialogHeaderEl.offsetTop
            
      // 获取到的值带px 正则匹配替换
      let styL, styT

      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
      if (sty.left.includes('%')) {
        styL = +document.body.clientWidth * (+sty.left.replace(/%/g, '') / 100)
        styT = +document.body.clientHeight * (+sty.top.replace(/%/g, '') / 100)
      } else {
        styL = +sty.left.replace(/\px/g, '')
        styT = +sty.top.replace(/\px/g, '')
      }
            
      document.onmousemove = function (e) {
        // 通过事件委托，计算移动的距离 
        const l = e.clientX - disX
        const t = e.clientY - disY

        // 移动当前元素  
        dragDom.style.left = `${l + styL}px`
        dragDom.style.top = `${t + styT}px`

        // 将此时的位置传出去
        // binding.value({x:e.pageX,y:e.pageY})
      }

      document.onmouseup = function (e) {
        document.onmousemove = null
        document.onmouseup = null
      }
    }  
  }
})

// v-dialogDragWidth: 弹窗宽度拖大 拖小
Vue.directive('dialogDragWidth', {
  bind (el, binding, vnode, oldVnode) {
    const dragDom = binding.value.$el.querySelector('.el-dialog')

    el.onmousedown = (e) => {           
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - el.offsetLeft
            
      document.onmousemove = function (e) {
        e.preventDefault() // 移动时禁用默认事件

        // 通过事件委托，计算移动的距离 
        const l = e.clientX - disX
        dragDom.style.width = `${l}px`
      }

      document.onmouseup = function (e) {
        document.onmousemove = null
        document.onmouseup = null
      }
    }  
  }
})

import '@/lib/DirecTives.js'

<template>
    <el-dialog
        v-dialogDrag
        ref="dialog__wrapper">
        <div class="dialog-body">
            
            <div 
                class="line"
                v-dialogDragWidth="$refs.dialog__wrapper"></div>
        </div>
    </el-dialog>
</template>