vue3 拖拽hooks(可兼容移动端)和自定义指令拖拽的实现代码

// 创建useDraggable.ts
export const useDraggable = (): Ref<HTMLDivElement | null> => {
  // 声明一个 ref，用于存储 div 元素的引用
  const divRef = ref<HTMLDivElement | null>(null)
  // 声明一些变量，用于存储鼠标或触摸位置以及拖拽状态
  let offsetX = 0 // 鼠标点击或触摸点距离 div 左侧的偏移
  let offsetY = 0 // 鼠标点击或触摸点距离 div 顶部的偏移
  let isDragging = false // 是否正在拖拽中
  // 禁用页面滚动的函数
  const disablePageScroll = () => {
    document.body.style.overflow = 'hidden'
  }
  // 启用页面滚动的函数
  const enablePageScroll = () => {
    document.body.style.overflow = 'auto'
  }
  // 开始拖拽，禁用页面滚动
  const startDragging = () => {
    isDragging = true
    disablePageScroll()
  }
  // 停止拖拽，启用页面滚动，并稍后重新启用点击事件
  const stopDragging = () => {
    isDragging = false
    enablePageScroll()
    setTimeout(() => {
      if (divRef.value) {
        divRef.value.style.pointerEvents = 'auto'
      }
    }, 100)
  }
  // 处理鼠标移动或触摸移动事件
  const handleMouseMove = (event: MouseEvent | TouchEvent) => {
    requestAnimationFrame(() => {
      if (isDragging && divRef.value) {
        const clientX = 'touches' in event ? event.touches[0].clientX : event.clientX
        const clientY = 'touches' in event ? event.touches[0].clientY : event.clientY
        const x = clientX - offsetX
        const y = clientY - offsetY
        // 阻止事件传播，避免干扰正常滚动
        event.stopPropagation()
        event.preventDefault()
        // 获取浏览器窗口的最大可视区域宽度和高度
        const maxX = window.innerWidth - (divRef.value.clientWidth || 0)
        const maxY = window.innerHeight - (divRef.value.clientHeight || 0)
        // 设置 div 的位置，确保不超出窗口范围
        divRef.value.style.left = `${Math.min(maxX, Math.max(0, x))}px`
        divRef.value.style.top = `${Math.min(maxY, Math.max(0, y))}px`
        // 禁用 div 上的点击事件，以避免拖拽时触发点击事件
        divRef.value.style.pointerEvents = 'none'
      }
    })
  }
  // 处理鼠标松开或触摸结束事件
  const handleMouseUp = () => {
    // 停止拖拽，恢复点击事件
    stopDragging()
    // 移除鼠标移动事件和触摸移动事件的监听器
    document.removeEventListener('touchmove', handleMouseMove)
    document.removeEventListener('mousemove', handleMouseMove)
  }
  // 处理鼠标按下或触摸开始事件
  const handleMouseDown = (event: MouseEvent | TouchEvent) => {
    if (!divRef.value) return
    // 获取鼠标点击或触摸点相对于 div 左侧和顶部的偏移
    offsetX = 'touches' in event ? event.touches[0].clientX - divRef.value.offsetLeft : event.clientX - divRef.value.offsetLeft
    offsetY = 'touches' in event ? event.touches[0].clientY - divRef.value.offsetTop : event.clientY - divRef.value.offsetTop
    // 开始拖拽，添加鼠标移动和触摸移动事件监听器
    startDragging()
    document.addEventListener('mousemove', handleMouseMove, {
      passive: false, // 阻止默认滚动行为
    })
    document.addEventListener('touchmove', handleMouseMove, {
      passive: false, // 阻止默认滚动行为
    })
    // 添加鼠标松开和触摸结束事件监听器
    document.addEventListener('mouseup', handleMouseUp)
    document.addEventListener('touchend', handleMouseUp)
  }
  // 在组件挂载时，添加鼠标按下和触摸开始事件监听器
  onMounted(() => {
    if (divRef.value) {
      divRef.value.addEventListener('mousedown', handleMouseDown)
      divRef.value.addEventListener('touchstart', handleMouseDown)
    }
  })
  // 在组件卸载时，移除事件监听器
  onUnmounted(() => {
    if (divRef.value) {
      divRef.value.removeEventListener('mousedown', handleMouseDown)
      divRef.value.removeEventListener('touchstart', handleMouseDown)
    }
    document.removeEventListener('mouseup', handleMouseUp)
    document.removeEventListener('touchend', handleMouseUp)
  })
  // 返回 div 元素的引用，可以在组件中使用该引用来创建可拖拽的元素
  return divRef
}

<template>
  <div
    ref="draggableDiv"
    class="it-layout-aside"
  >古德古德～</div>
</template>
<script setup lang="tsx">
  import { useDraggable } from '~/hooks/useDraggable'
  const draggableDiv = useDraggable()
</script>
<style lang="stylus" scoped>
.it-layout-aside
  flexCenter()
  position fixed
  bottom 100px
  right 10px
  width 60px
  height 60px
  border-radius 50%
  background rgba(0,0,0,.5)
  opacity 0.8
  color #fff
  font-size 40px
  cursor move
  &:hover
    opacity 1
</style>

const vDraggable = {
  mounted(el: HTMLElement) {
    let offsetX = 0
    let offsetY = 0
    let isDragging = false
    el.addEventListener('mousedown', event => {
      isDragging = false
      offsetX = event.clientX - el.offsetLeft
      offsetY = event.clientY - el.offsetTop
      const handleMouseMove = (e: MouseEvent) => {
        if (!isDragging && (Math.abs(event.clientX - offsetX) > 5 || Math.abs(event.clientY - offsetY) > 5)) {
          isDragging = true
        }
        if (isDragging) {
          const x = e.clientX - offsetX
          const y = e.clientY - offsetY
          el.style.left = `${Math.min(window.innerWidth - el.clientWidth, Math.max(0, x))}px`
          el.style.top = `${Math.min(window.innerHeight - el.clientHeight, Math.max(0, y))}px`
          el.style.pointerEvents = 'none'
        }
      }
      const handleMouseUp = () => {
        // 设置拖动状态为false
        isDragging = false
        setTimeout(() => {
          el.style.pointerEvents = 'auto'
        }, 100)
        // 移除鼠标移动和松开事件
        document.removeEventListener('mousemove', handleMouseMove)
        // eslint-disable-next-line @typescript-eslint/no-unused-vars
        document.removeEventListener('mouseup', handleMouseUp)
      }
    })
  },
}

<template>
  <div
    v-draggable
    class="it-layout-aside"
  >你潮嘛～</div>
</template>
<style lang="stylus" scoped>
.it-layout-aside
  flexCenter()
  position fixed
  bottom 100px
  right 10px
  width 60px
  height 60px
  border-radius 50%
  background rgba(0,0,0,.5)
  opacity 0.8
  color #fff
  font-size 40px
  cursor move
  &:hover
    opacity 1
</style>