直接上代码

handleScale() {
      const store = {
        scale: 1,
      }
      const start = {
        x: 0,
        y: 0,
      }
      const position = {
        top: 0,
        left: 0,
      }
      document.addEventListener('touchmove', function (event) {
      	// mavonEditor的图片预览会生成一个v-note-img-wrapper元素,里面有个img元素, 主要是控制这个缩放和移动
        const eleImg = document.getElementsByClassName('v-note-img-wrapper')[0]?.getElementsByTagName('img')[0]
        if (!eleImg) {
          return
        }
        // 阻止滚动链传递
        document.body.style.position = 'relative'
        document.body.style.overflow = 'hidden'
		
		// 元素移动
        eleImg.addEventListener('touchmove', function (e) {
          e.preventDefault()
          const touches = e.touches
          if (touches.length === 1) {
            if (start.x === 0 && start.y === 0) {
              start.x = touches[0].clientX
              start.y = touches[0].clientY
            }
            eleImg.style.position = 'relative'
            position.top += touches[0].clientY - start.y
            position.left += touches[0].clientX - start.x
            eleImg.style.left = `${position.left}px`
            eleImg.style.top = `${position.top}px`
            start.x = touches[0].clientX
            start.y = touches[0].clientY
          }
        })

        // 缩放事件的处理
        eleImg.addEventListener('touchstart', function (event) {
          const touches = event.touches
          const events = touches[0]
          const events2 = touches[1]
          // event.preventDefault()
          start.x = events.clientX
          start.y = events.clientY
          // 第一个触摸点的坐标
          store.pageX = events.pageX
          store.pageY = events.pageY

          // store.moveable = true

          if (events2) {
            store.pageX2 = events2.pageX
            store.pageY2 = events2.pageY
          }

          store.originScale = store.scale || 1
        })

        //event.preventDefault() // iphone预览状态下点击图片不能点击图片关闭预览模式, 所以这里不能阻止默认行为

        const touches = event.touches
        const events = touches[0]
        const events2 = touches[1]
        // 双指移动
        if (events2) {
          // 第2个指头坐标在touchmove时候获取
          if (!store.pageX2) {
            store.pageX2 = events2.pageX
          }
          if (!store.pageY2) {
            store.pageY2 = events2.pageY
          }

          // 获取坐标之间的举例
          const getDistance = function (start, stop) {
            return Math.hypot(stop.x - start.x, stop.y - start.y)
          }
          // 双指缩放比例计算
          const zoom =
            getDistance(
              {
                x: events.pageX,
                y: events.pageY,
              },
              {
                x: events2.pageX,
                y: events2.pageY,
              }
            ) /
            getDistance(
              {
                x: store.pageX,
                y: store.pageY,
              },
              {
                x: store.pageX2,
                y: store.pageY2,
              }
            )
          // 应用在元素上的缩放比例
          let newScale = store.originScale * zoom
          // 最大缩放比例限制
          if (newScale > 2) {
            newScale = 2
          }
          if (newScale < 1) {
            newScale = 1
          }
          // 记住使用的缩放值
          store.scale = newScale
          // 图像应用缩放效果
          eleImg.style.transform = 'scale(' + newScale + ')'
        }
      })
      document.addEventListener('touchend', function () {
        document.body.style.position = ''
        document.body.style.overflow = ''
        // store.moveable = false

        delete store.pageX2
        delete store.pageY2
      })
      document.addEventListener('touchcancel', function () {
        document.body.style.position = ''
        document.body.style.overflow = ''
        // store.moveable = false

        delete store.pageX2
        delete store.pageY2
      })
    },