uniapp implements check version detection and update

1. First you need to get the version of the current app

const systemInfo = uni.getSystemInfoSync();
			// 应用程序版本号
			// #ifdef APP
			me.version = systemInfo.appWgtVersion;
			// #endif
			// #ifdef H5
			me.version = systemInfo.appVersion;
			// #endif

2. Obtain the app version saved by the server

3. Click the button to verify the version number

 // 检查更新按钮
            checkUpdate () {
    
    
				const me = this
				const compare = me.compareVersion(me.version, me.webVersion)
				if (compare < 0) {
    
    
					me.$refs.version.open()
				} else {
    
    
					me.$showMessage('已是最新版本')
				}
			},            
            // 比较版本号
			compareVersion(v1, v2) {
    
    
				const arr1 = v1.split('.')
				const arr2 = v2.split('.')
				if (arr1.length === arr2.length) {
    
    
					for(let i = 0; i < arr1.length; i++) {
    
    
						let ver1 = parseInt(arr1[i] || '0')
						let ver2 = parseInt(arr2[i] || '0')
						if (ver1 > ver2) {
    
    
							return 1
						} else if (ver1 < ver2) {
    
    
							return -1
						}
					}
					return 0
				} else {
    
    
					this.$showMessage('版本号的长度不一致，请联系管理员解决')
					return 0
				}
			},

4. If the version number is not the latest, open a prompt pop-up window.

5. Click to download when updating and display the progress (pop-up window display).

You can get the download progress using the officially provided onProgressUpdate.

<uni-popup ref="process" type="center">
			<view class="popup-content">
				<progress :percent="progress" border-radius="5"></progress>
			</view>
			<view style="text-align: center;color: #fff;padding: 10px;">
				{
   
   { '下载中: ' +  progress + '%'}}
			</view>
</uni-popup>

   // 更新
            dialogConfirm () {
    
    
				this.$refs.version.close()
				var downloadTask = uni.downloadFile({
    
    
					url: base_url + '/UploadFile/base.apk',
					success: (res) => {
    
    
						this.$refs.process.close()
						this.progress = 0
						if (res.statusCode === 200) {
    
    
							uni.openDocument({
    
    
								filePath: res.tempFilePath,
								success() {
    
    }
							})
						}
					}
				})
				downloadTask.onProgressUpdate(res => {
    
    
					this.$refs.process.open()
					this.progress = res.progress
				})
			}

After the download is completed, close the pop-up window, use the obtained temporary address to open the file with uni.openDocument, and you can install it.

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