miniapp-ar/app.js

//app.js
App({
  SystemInfo: wx.getSystemInfoSync(),
  onLaunch: function() {
    var sysInfo = wx.getSystemInfoSync();
    console.log(sysInfo);
    this.globalData.innerWidth = sysInfo.windowWidth;
    this.globalData.innerHeight = sysInfo.windowHeight;
  },
  globalData: {
    userInfo: null
  }
})