在uniapp中实现APP自动更新功能，主要涉及到客户端在功能不断迭代过程中，需要进行自动更新。uniapp一个详细的实现步骤，包括客户端和服务器端的配置：

服务器端配置

版本信息管理

1. 服务器端需要维护一个数据库或配置文件，用于存储APP的最新版本信息，包括版本号、更新说明、下载链接等。
2. 提供一个API接口，客户端可以通过该接口获取最新版本信息。 

客户端实现

1. 版本信息获取：
   • 在uniapp的客户端，通过uni.request()方法调用服务器端的API接口，获取最新版本信息。
2. 版本比对：
   • 客户端获取到最新版本信息后，与当前APP的版本号进行比对。
   • 版本号比对逻辑可以根据实际情况设计，常见的做法是比较字符串或将其转换为数字进行比较。
3. 更新提示：
   • 如果发现新版本，则弹出更新提示框，引导用户进行更新。
   • 可以通过uni.showModal()方法显示更新提示框，并提供更新和取消的选项。
4. 下载并安装：
   • 用户确认更新后，客户端开始下载新版本APK文件。
   • 下载完成后，使用plus.runtime.install()方法安装APK文件。
   • 注意：安装APK文件需要用户授权，并且可能需要在Android的“设置”中开启“允许安装未知来源的应用”。
5. 静默更新（可选）：
   • 对于一些不需要用户干预的更新，可以考虑实现静默更新。
   • 静默更新通常涉及到wgt（widget）包的更新，而不是整个APK的替换。
   • uniapp提供了相关的插件和API支持wgt包的更新，如uni-upgrade-center等。

组件扩展简化调用

我们只需要在我们的首页引入版本自动更新组件即可。

<template><view class="container container329152"><!-- #ifdef APP --><diy-upgrade style="z-index: 999999999" image="/static/upgrade.png" upgradeUrl=""> </diy-upgrade><!--  #endif --><view class="clearfix"></view></view>
</template><script>export default {data() {return {//用户全局信息userInfo: {},//页面传参globalOption: {},//自定义全局变量globalData: {}};},onShow() {this.setCurrentPage(this);},onLoad(option) {this.setCurrentPage(this);if (option) {this.setData({globalOption: this.getOption(option)});}this.init();},methods: {async init() {}}};
</script><style lang="scss" scoped>.container329152 {}
</style>

组件库代码实现

diy-upgrade组件代码实现，大家如果对此组件库可按需进行二次开发扩展。

<template><view class="mask flex-center" v-if="showUpdate"><view class="content botton-radius" :class="[image?'':'no-imgae']"><view class="content-top" ><view class="content-top-text"><text>{{title}}</text><text class="content-top-text-version">v.{{version}}</text></view><image v-if="image" class="content-top" style="top: 0;" width="100%" height="100%":src='image'></image><view v-else  class="content-top" style="top: 0;" width="100%" height="100%"></view></view><view v-if="image"  class="content-header"></view><view class="content-body"><slot></slot><view class="body" v-if="contents"><scroll-view class="box-des-scroll" scroll-y="true"><rich-text :nodes="contents"></rich-text></scroll-view></view><view class="footer flex-center"><template v-if="isAppStore"><button class="content-button" :style="btnStyle"  style="border: none;color: #fff;" plain @click="jumpToAppStore">{{downLoadBtnTextiOS}}</button></template><template v-else><template v-if="!downloadSuccess"><view class="progress-box flex-column" v-if="downloading"><progress class="progress" border-radius="35" :percent="downLoadPercent":activeColor="btnBgColor" show-info stroke-width="10" /><view class="flex flex-center" style="width:100%;font-size: 28rpx;display: flex;justify-content: space-around;"><text>{{downLoadingText}}</text><text>({{downloadedSize}}/{{packageFileSize}}M)</text></view></view><button v-else class="content-button"  :style="btnStyle" style="border: none;color: #fff;" plain@click="updateApp">{{downLoadBtnText}}</button></template><button v-else-if="downloadSuccess && !installed"  :style="btnStyle" class="content-button"style="border: none;color: #fff;" plain :loading="installing" :disabled="installing"@click="installPackage">{{installing ? '正在安装……' : '下载完成，立即安装'}}</button><button v-if="installed && isWGT" :style="btnStyle" class="content-button" style="border: none;color: #fff;" plain@click="restart">安装完毕，点击重启</button></template></view></view><text v-if="!is_mandatory" class="close-img diy-icon-close" @click.stop="closeUpdate"></text></view></view>
</template><script>const localFilePathKey = 'UNI_ADMIN_UPGRADE_CENTER_LOCAL_FILE_PATH'const platform_iOS = 'iOS';let downloadTask = null;let openSchemePromise/*** 对比版本号，如需要，请自行修改判断规则* 支持比对	("3.0.0.0.0.1.0.1", "3.0.0.0.0.1")	("3.0.0.1", "3.0")	("3.1.1", "3.1.1.1") 之类的* @param {Object} v1* @param {Object} v2* v1 > v2 return 1* v1 < v2 return -1* v1 == v2 return 0*/function compare(v1 = '0', v2 = '0') {v1 = String(v1).split('.')v2 = String(v2).split('.')const minVersionLens = Math.min(v1.length, v2.length);let result = 0;for (let i = 0; i < minVersionLens; i++) {const curV1 = Number(v1[i])const curV2 = Number(v2[i])if (curV1 > curV2) {result = 1break;} else if (curV1 < curV2) {result = -1break;}}if (result === 0 && (v1.length !== v2.length)) {const v1BiggerThenv2 = v1.length > v2.length;const maxLensVersion = v1BiggerThenv2 ? v1 : v2;for (let i = minVersionLens; i < maxLensVersion.length; i++) {const curVersion = Number(maxLensVersion[i])if (curVersion > 0) {v1BiggerThenv2 ? result = 1 : result = -1break;}}}return result;}export default {props: {//更新图片image: {type: String,default: ''},//版本更新较验地址upgradeUrl:{type: String,default: ''},// 进度条颜色btnBgColor:{default: '',type: String}},data() {return {showUpdate:false,// 更新的版本号version: '',// 系统环境platform: '',// 下载链接url: '',// 跳转的应用市场列表storeList: [],type:'',// 从之前下载安装installForBeforeFilePath: '',// 安装installed: false,installing: false,// 下载downloadSuccess: false,downloading: false,downLoadPercent: 50,downloadedSize: 0,packageFileSize: 0,tempFilePath: '', // 要安装的本地包地址// 默认安装包信息title: '版本更新',contents: '',is_mandatory: false,// 可自定义属性downLoadBtnTextiOS: '立即跳转更新',downLoadBtnText: '立即下载更新',downLoadingText: '安装包下载中，请稍后',pageLevelNum: 0}},onBackPress() {// 强制更新不允许返回if (this.is_mandatory) {return true}downloadTask && downloadTask.abort()},onHide() {openSchemePromise = null},mounted() {this.init()},computed: {isWGT() {return this.type === 'wgt'},isiOS() {return !this.isWGT ? this.platform.includes(platform_iOS) : false;},isAppStore() {return this.isiOS || (!this.isiOS && !this.isWGT && this.url.indexOf('.apk') === -1)},btnStyle(){return this.btnBgColor?{background:this.btnBgColor}:{}}},methods: {// 获取更新内容片段getContentHTML(content) {let contentArr = content.split('\n');return contentArr.map(item => `<p>${item}</p>`).join('\n')},async init(){// #ifdef APP-PLUSlet thiz = this;if(!thiz.upgradeUrl){console.log('请配置版本较验地址')console.log("{url:'你的APK下越地址',version:'1.0.1',title:'版本更新',contents:'版本更新内容'}")uni.showToast({title:'请配置版本较验地址'})return;}uni.getSystemInfo({success: (res) => {let platform = res.platform;// 获取本机版本号plus.runtime.getProperty(plus.runtime.appid,async (wgtinfo) => {thiz.versionCode = wgtinfo.versionCode;let res = await getApp().globalData.currentPage.$http.post(thiz.upgradeUrl,{appid: plus.runtime.appid,platform,version: plus.runtime.version,wgtVersion: wgtinfo.version})res = res.data;console.log(res)//如果API返回新的地址，并判断版本是否相同if(res.url){thiz.url = res.urlthiz.version = res.version//判断API返回的版本是不是大于系统版本if(compare(thiz.version,wgtinfo.version)){// 跳转的应用市场列表thiz.storeList = res.store_list || [];thiz.title = res.title || '发现新版本';thiz.type = res.type;if(res.contents){thiz.contents =  thiz.getContentHTML(res.contents)}thiz.is_mandatory = res.is_mandatory||falsethis.checkLocalStoragePackage()}}});},fail(e){console.log(e)}});// #endif},goBack() {this.showUpdate = false},checkLocalStoragePackage() {// 如果已经有下载好的包，则直接提示安装const localFilePathRecord = uni.getStorageSync(localFilePathKey)if (localFilePathRecord) {const {version,savedFilePath,installed} = localFilePathRecord// 比对版本if (!installed && compare(version, this.version) === 0) {this.downloadSuccess = true;this.installForBeforeFilePath = savedFilePath;this.tempFilePath = savedFilePath} else {// 如果保存的包版本小 或 已安装过，则直接删除this.deleteSavedFile(savedFilePath)}}this.showUpdate = true;},async closeUpdate() {if (this.downloading) {if (this.is_mandatory) {return uni.showToast({title: '下载中，请稍后……',icon: 'none',duration: 500})}uni.showModal({title: '是否取消下载？',cancelText: '否',confirmText: '是',success: res => {if (res.confirm) {downloadTask && downloadTask.abort()this.goBack()}}});return;}if (this.downloadSuccess && this.tempFilePath) {// 包已经下载完毕，稍后安装，将包保存在本地await this.saveFile(this.tempFilePath, this.version)this.goBack()return;}this.goBack()},updateApp() {this.checkStoreScheme().catch(() => {this.downloadPackage()})},// 跳转应用商店checkStoreScheme() {const storeList = (this.store_list || []).filter(item => item.enable)if (storeList && storeList.length) {storeList.sort((cur, next) => next.priority - cur.priority).map(item => item.scheme).reduce((promise, cur, curIndex) => {openSchemePromise = (promise || (promise = Promise.reject())).catch(() => {return new Promise((resolve, reject) => {plus.runtime.openURL(cur, (err) => {reject(err)})})})return openSchemePromise}, openSchemePromise)return openSchemePromise}return Promise.reject()},downloadPackage() {this.downloading = true;//下载包downloadTask = uni.downloadFile({url: this.url,success: res => {if (res.statusCode == 200) {this.downloadSuccess = true;this.tempFilePath = res.tempFilePath// 强制更新，直接安装if (this.is_mandatory) {this.installPackage();}}},complete: () => {this.downloading = false;this.downLoadPercent = 0this.downloadedSize = 0this.packageFileSize = 0downloadTask = null;}});downloadTask.onProgressUpdate(res => {this.downLoadPercent = res.progress;this.downloadedSize = (res.totalBytesWritten / Math.pow(1024, 2)).toFixed(2);this.packageFileSize = (res.totalBytesExpectedToWrite / Math.pow(1024, 2)).toFixed(2);});},installPackage() {// #ifdef APP-PLUS// wgt资源包安装if (this.isWGT) {this.installing = true;}plus.runtime.install(this.tempFilePath, {force: false}, async res => {this.installing = false;this.installed = true;// wgt包，安装后会提示 安装成功，是否重启if (this.isWGT) {// 强制更新安装完成重启if (this.is_mandatory) {uni.showLoading({icon: 'none',title: '安装成功，正在重启……'})setTimeout(() => {uni.hideLoading()this.restart();}, 1000)}} else {const localFilePathRecord = uni.getStorageSync(localFilePathKey)uni.setStorageSync(localFilePathKey, {...localFilePathRecord,installed: true})}}, async err => {// 如果是安装之前的包，安装失败后删除之前的包if (this.installForBeforeFilePath) {await this.deleteSavedFile(this.installForBeforeFilePath)this.installForBeforeFilePath = '';}// 安装失败需要重新下载安装包this.installing = false;this.installed = false;uni.showModal({title: '更新失败，请重新下载',content: err.message,showCancel: false});});// 非wgt包，安装跳出覆盖安装，此处直接返回上一页if (!this.isWGT && !this.is_mandatory) {this.goBack()}// #endif},restart() {this.installed = false;// #ifdef APP-PLUS//更新完重启appplus.runtime.restart();// #endif},saveFile(tempFilePath, version) {return new Promise((resolve, reject) => {uni.saveFile({tempFilePath,success({savedFilePath}) {uni.setStorageSync(localFilePathKey, {version,savedFilePath})},complete() {resolve()}})})},deleteSavedFile(filePath) {uni.removeStorageSync(localFilePathKey)return uni.removeSavedFile({filePath})},jumpToAppStore() {plus.runtime.openURL(this.url);}}}
</script><style>page {background: transparent;}.flex-center {/* #ifndef APP-NVUE */display: flex;/* #endif */justify-content: center;align-items: center;}.mask {position: fixed;left: 0;top: 0;right: 0;bottom: 0;background-color: rgba(0, 0, 0, .65);}.botton-radius {border-radius: 30rpx;}.content {position: relative;top: 0;width: 600rpx;background-color: #fff;box-sizing: border-box;padding: 0 50rpx;font-family: Source Han Sans CN;}.text {/* #ifndef APP-NVUE */display: block;/* #endif */line-height: 200px;text-align: center;color: #FFFFFF;}.content-top {position: absolute;top: -195rpx;left: 0;width: 600rpx;height: 270rpx;}.content-top-text {font-size: 45rpx;font-weight: bold;color: #F8F8FA;position: absolute;top: 120rpx;left: 50rpx;z-index: 1;.content-top-text-version{font-size: 24rpx;}}.no-imgae .content-top{padding-top:30px;height: auto;}.no-imgae .content-top,.no-imgae .content-top .content-top-text{position: relative;top:0;left:0;color:#000;width:100%;}.content-header {height: 70rpx;}.title {font-size: 33rpx;font-weight: bold;color: #3DA7FF;line-height: 38px;}.footer {height: 150rpx;display: flex;align-items: center;justify-content: space-around;}.box-des-scroll {box-sizing: border-box;min-height: 100rpx;max-height: 400rpx;text-align: left;}.box-des {font-size: 26rpx;color: #000000;line-height: 50rpx;}.progress-box {width: 100%;}.progress {width: 90%;height: 40rpx;border-radius: 35px;}.close-img {width: 70rpx;height: 70rpx;z-index: 1000;position: absolute;bottom: -120rpx;left: calc(50% - 70rpx / 2);font-size: 60rpx;color:#fff;}.content-button {text-align: center;flex: 1;font-size: 30rpx;font-weight: 400;color: #FFFFFF;border-radius: 40rpx;margin: 0 18rpx;height: 80rpx;line-height: 80rpx;background: linear-gradient(to right, #1785ff, #3DA7FF);}.content-button.button-hover {transform: translate(1rpx, 1rpx);}.flex-column {display: flex;flex-direction: column;align-items: center;}
</style>