带进度条的App自动更新，效果如下图所示：

 　  技术：vue、vant-ui、5+

　　封装独立组件AppProgress.vue：

<template>
  <div>
    <van-dialog v-model="show" confirm-button-text="后台下载" class="app-update">
      <img src="../../assets/imgs/progress-bar.png" />
      <van-progress :percentage="percentageva l" />
      <div class="msg">版本更新中，请稍后...</div>
    </van-dialog>
  </div>
</template>

<script>
// app下载进度组件
export default {
  props: {
    // 进度值
    percentageva l: {
      type: Number,
      default: 0
    },
    // 是否显示弹窗
    show: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {}
  }
}
</script>

<style lang="scss" scoped>
img {
  width: 270px;
  height: 163px;
  position: fixed;
  top: -35px;
  z-index: 2200;
}
</style>
<style lang="scss">
.app-update.van-dialog {
  overflow: visible;
  width: 270px;
  border-radius: 12px;
  .van-progress {
    margin-top: 124px;
    z-index: 2300;
  }
  .msg {
    font-size: 16px;
    font-weight: 600;
    color: white;
    position: absolute;
    top: 50px;
    z-index: 2300;
    width: 100%;
    text-align: center;
  }
  .van-dialog__footer {
    border-radius: 12px;
    .van-button--default {
      .van-button__text {
        width: 105px;
        height: 26px;
        border-radius: 13px;
        background-color: #006eff;
        color: white;
        font-weight: 600;
        font-size: 12px;
        display: inline-block;
        margin-top: 10px;
        line-height: 26px;
      }
    }
  }
}
</style>

app升级代码，封装独立js文件：appUpdateOptions.js

/**
 * IOS 包发布到应用市场后要更新此处的ID，替换掉测试ID：1053012308
 */
/* eslint-disable no-undef */
import { getVersion } from '@/services/login';
import request from '../../api/ajax.js';
import { Dialog } from 'vant';
import expiredStorage from '@/utils/expiredStorage.js';

function sleep(numberMillis) {
  var now = new Date();
  var exitTime = now.getTime() + numberMillis;
  while (true) {
    now = new Date();
    if (now.getTime() > exitTime) return;
  }
}

// Vue继承的基础对象
export default {
  data() {
    return {
      show: false,
      percentageva l: 0
    };
  },
  methods: {
    appUpdate(ismanual) {
      const that = this;
      console.log('appUpdate');
      // 获取5+运行环境的版本号
      console.log('5+ Runtime version：' + plus.runtime.innerVersion);
      plus.runtime.getProperty(plus.runtime.appid, function(inf) {
        const ver = inf.version;
        console.log('ver:' + ver);
        var ua = navigator.userAgent.toLowerCase();
        // 苹果手机
        if (/iphone|ipad|ipod/.test(ua)) {
          // 获取当前上架APPStore版本信息
          request
            .get('https://itunes.apple.com/lookup?id=1053012308', {
              id: 1053012308 // APP唯一标识ID
            })
            .then(data => {
              console.log('data:' + JSON.stringify(data));
              var resultCount = data.resultCount;
              for (var i = 0; i < resultCount; i++) {
                var normItem = data.results[i].version;
                console.log('normItem:' + normItem);
                if (normItem > ver) {
                  var _msg = '发现新版本:V' + normItem;
                  // plus.nativeUI.alert("发现新版本:V" + normItem);
                  Dialog.confirm({
                    title: '升级确认',
                    message: _msg
                  })
                    .then(() => {
                      // on confirm
                      // 执行升级操作
                      document.location.href =
                        'https://itunes.apple.com/cn/app/id1053012308?mt=8'; // 上新APPStore下载地址
                    })
                    .catch(() => {
                      // on cancel
                      expiredStorage.setItem('$upgradeTip', false, 1 / 12); // 1/12天内不再显示升级提示
                    }