element UI中el-dialog实现拖拽功能示例代码

dialogDraggable.js代码：
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 
      } 
    } 
  } 
}) 

import ‘@/assets/dialogDraggable.js'

< el-dialog v-dialogDrag></ el-dialog>