//app.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)
  },
  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)
            }
          })
        }
      })
    }
  },
  globalData:{
    userInfo:null
  }
})
//app.json

{
"pages":[
"pages/index/index"
],
"window":{
"backgroundTextStyle":"dark",
"navigationBarBackgroundColor": "#fff",
"navigationBarTitleText": "记账",
"navigationBarTextStyle":"black",
"backgroundColor": "gray"
},
"debug":true
}

.container {
  display: flex;
  flex-direction: column; 
}