vue 实现div拖拽功能

arrowMove(e) { // 拖拽设备域
      // 元素大小
      let elW = e.currentTarget.offsetWidth
      let elH = e.currentTarget.offsetHeight
      // 元素位置
      let elL = e.currentTarget.offsetLeft
      let elT = e.currentTarget.offsetTop
      // 鼠标位置
      let x = e.clientX
      let y = e.clientY
      // 窗口大小
      let w = window.innerWidth
      let h = window.innerHeight
      // 鼠标到元素左边距离
      let moveX = x - elL
      let moveY = y - elT
      let el = e.currentTarget
      document.onmousemove = function (e) {
        el.style.left = e.clientX - moveX + 'px'
        el.style.top = e.clientY - moveY + 'px'
      }
      document.onmouseup = function () {
        document.onmousemove = null
        document.onmouseup = null
      }
    },