app.js

//app.js
App({
  buf2hex: function (buffer) {
    return Array.prototype.map.call(new Uint8Array(buffer), x => ('00' + x.toString(16)).slice(-2)).join('')
  },
  buf2string: function (buffer) {
    var arr = Array.prototype.map.call(new Uint8Array(buffer), x => x)
    var str = ''
    for (var i = 0; i < arr.length; i++) {  
      str += String.fromCharCode(arr[i])
    }
    return str
  },
  onLaunch: function () {
    this.globalData.SystemInfo = wx.getSystemInfoSync()
    //console.log(this.globalData.SystemInfo)
    const updateManager = wx.getUpdateManager()
    updateManager.onCheckForUpdate(function (res) {
    })
  
    updateManager.onUpdateReady(function () {
      wx.showModal({
        title: '更新提示',
        content: '新版本已经准备好，是否重启应用？',
        success(res) {
          if (res.confirm) {
            // 新的版本已经下载好，调用 applyUpdate 应用新版本并重启
            updateManager.applyUpdate()
          }
        }
      })
    })
    updateManager.onUpdateFailed(function () {
      // 新版本下载失败
    })
  },
  globalData: {
    SystemInfo: {}
  }
})