app.js

var Data = require('scripts/fetch.js')

App({
  onLaunch: function () {
    //调用API从本地缓存中获取数据
    var logs = wx.getStorageSync('logs') || []
    logs.unshift(Date.now())
    wx.setStorageSync('logs', logs)

    // 获取用户信息
    this.getUserInfo()
    this.getSystemInfo()
  },
  getUserInfo:function(cb){
    var that = this
    if(this.globalData.userInfo){
      typeof cb == "function" && cb(this.globalData.userInfo)
    }else{
      //调用登录接口
      wx.login({
        success: function () {
          wx.getUserInfo({
            success: function (res) {
              that.globalData.userInfo = res.userInfo
              typeof cb == "function" && cb(that.globalData.userInfo)
            }
          })
        }
      })
    }
  },
  getSystemInfo: function (cb) {
    var that = this
    if (that.globalData.systemInfo) {
      typeof cb == "function" && cb(that.globalData.systemInfo)
    } else {
      wx.getSystemInfo({
        success: function(res) {
          that.globalData.systemInfo = res
          typeof cb == "function" && cb(that.globalData.systemInfo)
        }
      })
    }
  },
  globalData: {
    userInfo: null,
    systemInfo: null
  },

  backendData: Data
})