Explanation of the app.userInfoReadyCallback function on the WeChat applet homepage

Reference link: https://blog.csdn.net/mr_wuch/article/details/7833914 6

app.userInfoReadyCallback = res => {  
    this.setData({  
      userInfo: res.userInfo,  
      hasUserInfo: true  
    })  
}  

ES6 arrow functions explained: https://segmentfault.com/a/1190000009410939