1.在uniapp项目中的App.vue文件下

<script>import { ref } from 'vue';const token = ref();export default {onLaunch: function() {// #ifdef APP//获取打包时设置的版本号，然后存到storage里plus.runtime.getProperty(plus.runtime.appid, (wgtinfo) => {uni.setStorage({key: 'VersionCode',data: wgtinfo.versionCode})})// #endif},onShow: function() {// console.log('App Show')},onHide: function() {// console.log('App Hide')},}
</script><style lang="scss">@import "@/uni_modules/uview-plus/index.scss";html,body {overflow: hidden;overscroll-behavior: none;}
</style>

2. 具体实现代码

<template>
<view class="firm" v-show="showbaifenbi">已下载:<progress :percent="baifenbi" show-info stroke-width="3" /></view><view class="fullScreenMask" v-if="ifFullScreenMask"><view class="kuang"><view class="tit">温馨提示</view><view class="al_tit">当前版本不是最新版本,请前往应用商店下载!</view></view></view></template>
// 显示下载进度
let showbaifenbi = ref(false);
let baifenbi : any = ref(0);
let ifFullScreenMask = ref(false)onLoad(() => {uni.getSystemInfo({success: function (resInfo : any) {userEquipment.value = resInfo.osNameuni.getStorage({key: 'VersionCode',success: async (resData) => {// 获取最新版本的applet res = await proxy.$http("app_version/getAppVersionByNew",);let urlData = Url.value + res.data.url;if (Number(res.data.version_code) > Number(resData.data)) {if (userEquipment.value == 'android') {ifFullScreenMask.value = false// 方法一 ：直接调取打开浏览器// plus.runtime.openURL(urlData)// 方法二 : 提示用户uni.showModal({title: '提示',content: '当前版本不是最新版本,点击下载',showCancel: false,success: function (res : any) {plus.nativeUI.showWaiting(`正在下载...`);showbaifenbi.value = truevar dtask = plus.downloader.createDownload(urlData,{method: "GET"}, (d, status) => {console.log(d);if (status == 200) {plus.runtime.install(d.filename)} else {plus.nativeUI.alert("安装失败，请稍候重试: " + status)}});//监听下载dtask.addEventListener("statechanged", listenStatechanged)dtask.start();}});} else {ifFullScreenMask.value = truereturn}} else {uni.showToast({title: '当前已经是最新版本',icon: 'none',position: 'bottom'});return}}})}});})/* 监听下载进度 */function listenStatechanged(task : any) {let num : any = parseInt(task.downloadedSize) / parseInt(task.totalSize) * 100baifenbi.value = parseInt(num)if (num == 100) {showbaifenbi.value = falseplus.nativeUI.closeWaiting();uni.showModal({title: '提示',content: '下载完成,请安装新版本',showCancel: false,success: () => {plus.runtime.quit();}})}}

ios的话自行给提示 去应用商店下载