How to obtain openid and user information through WeChat applet

This article mainly introduces how the WeChat applet obtains openid and user information. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

1. Get openid

1.1 Get code

Call the interface to get the login credentials (code) and then exchange the user login status information, including the user’s unique Identity (openid) and session key (session_key) for this login. Encryption and decryption of user data communication depends on the session key.

wx.login({
 //获取code
 success: function(res) {
   code = res.code //返回code
 }
})

1.2 Get openid

Get the code obtained in the previous step, combine the mini program appid and secret request interface https://api.weixin.qq.com/sns/jscode2session ?appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code is exchanged for openid. What is returned together with openid also includes session_key, where session_key is the key for encrypting and signing user data. For the sake of application security, session_key should not be transmitted over the network.

wx.request({
 url: 'https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret=SECRET&js_code='+ code +'&grant_type=authorization_code',
 data: {},
 header: {
   'content-type': 'application/json'
 },
 success: function(res) {
  openid = res.data.openid //返回openid
 }
})

2. Get user information

2.1 Create the global method in app.js

//app.js
getUserInfo:function(cb){
 var that = this
 if(this.globalData.personInfo){
  typeof cb == "function" && cb(this.globalData.personInfo)
 }else{
  //调用登录接口
  wx.login({
   success: function () {
    wx.getUserInfo({
     success: function (res) {
      that.globalData.personInfo = res.userInfo
      typeof cb == "function" && cb(that.globalData.personInfo)
     }
    })
   }
  })
 }
}

2.2 Instantiate the global method to get user information

var that = this;
//调用应用实例的方法获取全局数据
app.getUserInfo(function (personInfo) {
 //更新数据
 that.setData({
  personInfo: personInfo
 })
})

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