uni-app 实现APP的版本更新

在index.vue 中的onload方法里面或者app.vue中的onLaunch中添加如下部分：

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update() {     var _this = this;     uni.request({     url: `${this.$store.state.apiBaseUrl}/users/versions`,  //请求接口     method: 'POST',     success: result => {         if (result.data.code == 1) {             plus.runtime.getProperty(plus.runtime.appid, function(inf) {                 if(inf.version != result.data.data.versions){                     uni.showModal({                         title: "发现新版本",                         content: "确认下载更新",                         success: (res) => {                             if (res.confirm == true) {//当用户确定更新，执行更新                                 _this.doUpData();                             }                         }                     })                 }             });         }     },     }) },   doUpData() {     uni.showLoading({         title: '更新中……'     })     uni.downloadFile({//执行下载         url: '***', //下载地址         success: downloadResult => {//下载成功             uni.hideLoading();             if (downloadResult.statusCode == 200) {                 uni.showModal({                     title: '',                     content: '更新成功，确定现在重启吗？',                     confirmText: '重启',                     confirmColor: '#EE8F57',                     success: function(res) {                         if (res.confirm == true) {                             plus.runtime.install(//安装                                 downloadResult.tempFilePath, {                                     force: true                                 },                                 function(res) {                                     utils.showToast('更新成功，重启中');                                     plus.runtime.restart();                                 }                             );                         }                     }                 });             }         }     }); }