5+APP 实现更新下载

• 监听
• 获取线上版本
• 判断版本号
• 下载

		<script type='text/javascript'>
			document.addEventListener('plusready', function() {
				function getCurrentVersion() {
					return plus.runtime.versionCode
				}

				async function getServerVersion() {
					const xhr = new XMLHttpRequest()
					xhr.open('POST', '服务器地址')
					return new Promise((resolve, reject) => {
						xhr.onreadystatechange = function() {
							if (xhr.readyState === 4 && xhr.status === 200) {
								const jsonData = JSON.parse(xhr.responseText)
								resolve(jsonData.versionCode)
							}
						}
						xhr.onerror = function() {
							reject(new Error('Request failed'))
						}
						xhr.send()
					})
				}

				function compareVersion(localVersion, serverVersion) {
					if (serverVersion == localVersion) {
						alert('当前已经是最新版本了！')
					} else {
						const confirmText = confirm('发现最新版本，是否立即更新？')
						if (confirmText) {
							downloadNewVersion()
						} else {
							alert('您选择了取消！')
						}
					}
				}

				function downloadNewVersion() {
					alert('下载中，请勿关闭页面')
					const url = '下载地址'
					const dtask = plus.downloader.createDownload(url, {
						method: "GET"
					}, function(d, status) {
						if (status == 200) {
							const filePath = d.filename
							plus.runtime.install(filePath, {
								force: true
							}, function() {
								alert('安装成功，重启中...')
							}, function(e) {
								console.error('安装失败: ' + e.message);
								alert('安装失败')
							})
						} else {
							console.log('下载失败: ' + status)
							alert('下载失败，请重新下载!')
						}
					})
					dtask.start()
				}

				async function checkAndUpdateVersion() {
					try {
						const localVersion = getCurrentVersion()
						// alert(localVersion)
						const serverVersion = await getServerVersion()
						// alert(serverVersion)
						compareVersion(localVersion, serverVersion)
					} catch (error) {
						console.error(error)
					}
				}

				checkAndUpdateVersion()
			})
		</script>

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