详解微信小程序开发用户授权登陆

var common = require("../Common/Common.js")

//用户登陆
function userLogin() {
 wx.checkSession({
  success: function () {
   //存在登陆态
  },
  fail: function () {
   //不存在登陆态
   onLogin()
  }
 })
}
 
function onLogin() {
 wx.login({
  success: function (res) {
   if (res.code) {
    //发起网络请求
    wx.request({
     url: 'Our Server ApiUrl',
     data: {
      code: res.code
     },
     success: function (res) {
      const self = this
      if (逻辑成功) {
       //获取到用户凭证 存儲 3rd_session 
       var json = JSON.parse(res.data.Data)
       wx.setStorage({
        key: "third_Session", 
        data: json.third_Session
       })
       getUserInfo()
      }
      else {
 
      }
     },
     fail: function (res) {
 
     }
    })
   }
  },
  fail: function (res) {
 
  }
 })
 
}
 
function getUserInfo() {
 wx.getUserInfo({
  success: function (res) {
   var userInfo = res.userInfo
   userInfoSetInSQL(userInfo)
  },
  fail: function () {
   userAccess()
  }
 })
}
 
function userInfoSetInSQL(userInfo) {
 wx.getStorage({
  key: 'third_Session',
  success: function (res) {
   wx.request({
    url: 'Our Server ApiUrl',
    data: {
     third_Session: res.data,
     nickName: userInfo.nickName,
     avatarUrl: userInfo.avatarUrl,
     gender: userInfo.gender,
     province: userInfo.province,
     city: userInfo.city,
     country: userInfo.country
    },
    success: function (res) {
     if (逻辑成功) {
      //SQL更新用户数据成功
     }
     else {
      //SQL更新用户数据失败
     }
    }
   })
  }
 })
}

if (dicRequestData.ContainsKey("CODE"))
    {
      string apiUrl = string.Format("https://api.weixin.qq.com/sns/jscode2session?appid={0}&secret={1}&js_code={2}&grant_type=authorization_code", ProUtil.SmartAppID, ProUtil.SmartSecret, dicRequestData["CODE"]);
    
      HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(apiUrl);
      myRequest.Method = "GET";
      HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
      StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
      string content = reader.ReadToEnd();
      myResponse.Close();
      reader.Close();
      reader.Dispose();
 
      //解析
      userModel ReMsg = JSONUtil.JsonDeserialize<userModel>(content); //解析
      if ((!string.IsNullOrWhiteSpace(ReMsg.openid)) && (!string.IsNullOrWhiteSpace(ReMsg.session_key)))
      {
        // 成功 自定义生成3rd_session与openid&session_key绑定并返回3rd_session
 
      }
      else
      {
        // 错误 未获取到用户openid 或 session
      }
    }
    else
    {
      // 错误 未获取到用户凭证code
    }