vue dom拖拽指令

还可以封装一下代码，不想封了，移动端pc端区别：事件不同，pc端鼠标事件移动端触摸事件；pc端直接获取e.pageX,移动端e.changedTouches[0].pageX

使用直接在dom绑定v-drag

  directives: {
    drag(el, bindings, vnode) {
      let phone = false
      let max = max || 0
      if(window.navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)) {
        phone = true;  // 移动端
      }
      let scaleRates = scaleRates || 1 // dom缩放比例   特殊需求预留位置

      // 移动端
      if(phone){
        el.ontouchstart = function (e) {
          if(bindings.value.cantChange !== true){
            bindings.value.style['z-index'] = max + 1
          }
          // 不能操作
          if(bindings.value.isClock === true || bindings.value.operate === false){
            return
          }
          var disx = (e.changedTouches[0].pageX / scaleRates) - el.offsetLeft
          var disy = (e.changedTouches[0].pageY / scaleRates) - el.offsetTop
          const move = (e) => {
            el.style.left = ((e.pageX / scaleRates) - disx) + 'px'
            el.style.top = ((e.pageY / scaleRates) - disy) + 'px'
            bindings.value.style.left = ((e.changedTouches[0].pageX / scaleRates) - disx) + 'px'
            bindings.value.style.top = ((e.changedTouches[0].pageY / scaleRates) - disy) + 'px'
          }
          document.ontouchmove = function(e){
            move(e)
          }

          const up = (e) => {
            document.ontouchmove = document.ontouchend = null
          }

          document.ontouchend = function (e) {
            up(e)
          }
        }
      }
      // pc端
      else{
        el.onmousedown = function (e) {
          if(bindings.value.cantChange !== true){
            bindings.value.style['z-index'] = max + 1
          }
          // 不能操作
          if(bindings.value.isClock === true || bindings.value.operate === false){
            return
          }
          var disx = (e.pageX / scaleRates) - el.offsetLeft
          var disy = (e.pageY / scaleRates) - el.offsetTop
          const move = (e) => {
            el.style.left = ((e.pageX / scaleRates) - disx) + 'px'
            el.style.top = ((e.pageY / scaleRates) - disy) + 'px'
            bindings.value.style.left = ((e.pageX / scaleRates) - disx) + 'px'
            bindings.value.style.top = ((e.pageY / scaleRates) - disy) + 'px'
          }
          document.onmousemove = function(e){
            move(e)
          }

          const up = (e) => {
            document.onmousemove = document.onmouseup = null
          }

          document.onmouseup = function (e) {
            up(e)
          }
        }
      }
    }
  },