How to obtain openid and user information through mini program

This time I will bring you the method of obtaining openid and user information through a small program. What are the precautions for the small program to obtain openid and user information? The following is a practical case, let's take a look.

How to obtain openid and user information in WeChat applet

1. Get openid

##1.1 Get code

user login status information, including the user's unique identifier (openid) and the session key for this login ( session_key). 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

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, where session_key is the password for encrypting and signing user data key. 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 this 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 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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