vue 实现 el-dialog 拖动

js代码
创建文件dialogDrag.js

const dialogDrag = (app) => {
  app.directive('dialogdrag', {
    // 渲染完毕
    mounted(el, vnode) {
      const dialogHeaderEl = el.querySelector('.el-dialog__header')
      const dragDom = el.querySelector('.el-dialog')
      dialogHeaderEl.style.cssText += ';cursor:move;'
      dragDom.style.cssText += ';top:0px;'

      // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
      const getStyle = (function () {
        if (window.document.currentStyle) {
          return (dom, attr) => dom.currentStyle[attr]
        } else {
          return (dom, attr) => getComputedStyle(dom, false)[attr]
        }
      })();

      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

        const dragDomWidth = dragDom.offsetWidth
        const dragDomheight = dragDom.offsetHeight

        const screenWidth = document.body.clientWidth
        const screenHeight = document.body.clientHeight

        const minDragDomLeft = dragDom.offsetLeft
        const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth

        const minDragDomTop = dragDom.offsetTop
        const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight

        // 获取到的值带px 正则匹配替换
        let styL = getStyle(dragDom, 'left')
        let styT = getStyle(dragDom, 'top')

        if (styL.includes('%')) {
          styL = +document.body.clientWidth * (+styL.replace(/%/g, '') / 100)
          styT = +document.body.clientHeight * (+styT.replace(/%/g, '') / 100)
        } else {
          styL = +styL.replace(/\px/g, '')
          styT = +styT.replace(/\px/g, '')
        }

        document.onmousemove = function (e) {
          // 通过事件委托，计算移动的距离
          let left = e.clientX - disX
          let top = e.clientY - disY

          // 边界处理
          if (-(left) > minDragDomLeft) {
            left = -minDragDomLeft
          } else if (left > maxDragDomLeft) {
            left = maxDragDomLeft
          }

          if (-(top) > minDragDomTop) {
            top = -minDragDomTop
          } else if (top > maxDragDomTop) {
            top = maxDragDomTop
          }

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

          // emit onDrag event
          vnode.child.$emit('dragDialog')
        }

        document.onmouseup = function () {
          document.onmousemove = null
          document.onmouseup = null
        }
      }
    }
  })
}
export default dialogDrag

2 全局挂载

const app = createApp(App);
app.use(dialogDrag)

3 . 如何引用使用？

//在el-dialog  上直接加  v-dialogdrag 
  <el-dialog   v-dialogdrag center :title="`质疑`" width="60%" :draggable="true"   :close-on-press-escape="false"
               :close-on-click-modal="false"
               :destroy-on-close="true"
               v-model="dialogVisibleShow" >
      <hr/>
      <el-input type="textarea" :autosize="{ minRows: 2, maxRows: 4 }" placeholder="请输入内容"
                v-model="requestParamData.content"></el-input>
      <hr/>
      <div style="width: 100%; display: flex; justify-content: end">
        <el-button @click="dialogVisibleShow = false">取 消</el-button>
        <el-button type="primary" @click="saveZhiYi">确 定</el-button>
      </div>
    </el-dialog>

//如果未生效，可在外边套层div 在外边的上加 v-dialogdrag 列如:

//在el-dialog  上直接加  v-dialogdrag 
<div   v-dialogdrag>
  <el-dialog  center :title="`质疑`" width="60%" :draggable="true"   :close-on-press-escape="false"
               :close-on-click-modal="false"
               :destroy-on-close="true"
               v-model="dialogVisibleShow" >
      <hr/>
      <el-input type="textarea" :autosize="{ minRows: 2, maxRows: 4 }" placeholder="请输入内容"
                v-model="requestParamData.content"></el-input>
      <hr/>
      <div style="width: 100%; display: flex; justify-content: end">
        <el-button @click="dialogVisibleShow = false">取 消</el-button>
        <el-button type="primary" @click="saveZhiYi">确 定</el-button>
      </div>
    </el-dialog>
    </div>