How to obtain openid and user information in 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

How the WeChat applet obtains openid and user information.

1. Get openid

1.1 Get code

Call the interface to obtain the login credentials (code) and then exchange the user login status information, including the user's unique identifier (openid) and the 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 , combined with 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 in exchange for openid, which is returned together with openid, also includes session_key, of which session_key Is the key used to encrypt and sign 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 in app.js Create this global method in

//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 obtain 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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