const { writeFile, mkdir, existsSync } = require('fs')
// 动态生成版本号
const createVersion = () => {
  // mkdir('./dist', { recursive: true }, (err) => {
  //检测dist目录是否存在
  if (existsSync('./dist')) {
    writeFile(`./dist/version.json`, `{"version":"${Date.now()}"}`, (err) => {
      if (err) {
        console.log('写入version.json失败')
        console.log(err)
      } else {
        console.log('写入version.json成功')
      }
    })
  } else {
    setTimeout(createVersion, 1000)
  }
  // })
}
setTimeout(createVersion, 10000)

以下两种方式都需要在vue.config.js里加上上面这段代码

第一种

// auto-update.js
/*
 * @Description: 自动更新
 */

import Vue from 'vue'
import Modal from './updateModal.vue'

let currentVersion // 当前版本
let hidden = false // 页面是否隐藏
let setTimeoutId

// 获取版本号
const getVersion = async () => {
  return fetch(process.env.VUE_APP_BASE_URL + 'version.json?timestep=' + Date.now()).then(res => res.json())
}

// 检查更新
const checkUpdate = async () => {
  const version = (await getVersion()).version
  if (Number(version) > Number(currentVersion)) {
    const result = confirm('发现新版本，点击确定更新')

    if (result) {
      location.reload() // 刷新当前页
    }
    
  }
}

// 自动更新
const autoUpdate = async () => {
  setTimeoutId = setTimeout(async () => {
    console.log(setTimeoutId, '这是个检查自动更新的定时器')
    // 页面隐藏了就不检查更新
    if (!hidden) {
      checkUpdate()
    }
    autoUpdate()
  }, 10 * 1000)
}

// 停止检测更新
const stop = () => {
  if (setTimeoutId) {
    clearTimeout(setTimeoutId)
    setTimeoutId = ''
  }
}

// 开始检查更新
const start = async () => {
  currentVersion = (await getVersion()).version
  autoUpdate()
  // 监听页面是否隐藏
  document.addEventListener('visibilitychange', () => {
    console.log(document.hidden, '能监听到啥')
    hidden = document.hidden
    if (hidden) {
      stop()
    } else {
      checkUpdate()
      autoUpdate()
    }
  })
}

export default { start }

第二种

// update.worker.js， 我放在了public下

let currentVersion // 当前版本
let hidden = false // 页面是否隐藏
let setIntervalId

// 获取版本号
const getVersion = async () => {
  // return fetch('http://localhost:8080/version.json?timestep=' + Date.now()).then(res => res.json())
  // const url = window.location.origin // 无法读取window
  return fetch('https://xxxx.com/version.json?timestep=' + Date.now()).then(res => res.json(), { cache: 'no-store' })
}

// 检查更新
const checkUpdate = async () => {
  let isUpdate = false
  const version = (await getVersion()).version
  if (Number(version) > Number(currentVersion)) {
    console.log('发现新版本，点击确定更新--update.worker.js')
    return (isUpdate = true)
  } else {
    return (isUpdate = false)
  }
}

// 停止检测更新
const stop = () => {
  if (setIntervalId) {
    clearInterval(setIntervalId)
    setIntervalId = ''
  }
}

self.onmessage = async event => {
  var data = event.data
  currentVersion = (await getVersion()).version

  if (data.pageVisibility) {
    stop()
    return
  }

  setIntervalId = setInterval(async () => {
    const isUpdate = await checkUpdate()
    if (isUpdate) {
      stop()
      self.postMessage({
        isUpdate: true
      })
    }
  }, 5 * 1000)

  console.log(data, '子线程worker.js')
}

随便一个全局文件里使用下面代码

var worker = new Worker('http://localhost:8080/update.worker.js')
    const url = window.location.origin
    var worker = new Worker(url + 'update.worker.js')
    // var worker = new Worker('/update.worker.js')
    let data = { pageVisibility: false }
    worker.postMessage(data)
    worker.onmessage = function(event) {
      console.log(event.data, 'worker主线程1')

      if (event.data?.isUpdate) {
        // const result = confirm('发现新版本，点击确定更新')
        // if (result) {
        //   // location.reload(true) // 刷新当前页
        //   // window.location.reload(true)
        //   window.location.replace(window.location.href)
        // }
        Notification({
          title: '页面更新提示',
          message: '网页内容有更新，请按shift+F5刷新页面',
          duration: 0,
          type: 'success',
          onClose: () => {}
        })
        worker.terminate()
      }
    }

    worker.onerror = function(event) {
      console.log(event)
      // console.error(event.filename + ':' + event.message)
      //如果发生错误,立即终止代码
      worker.terminate()
    }

    // 监听页面是否隐藏
    document.addEventListener('visibilitychange', () => {
      console.log(document.hidden, '能监听到啥-html')
      let hidden = document.hidden
      data.pageVisibility = hidden
    })