微信小程序如何获取用户session_key,openid,unioni（代码）

微信小程序中获取用户session_key,openid,unioni，这是小程序中经常可以看到的功能，那么如何实现小程序获取session_key,openid和unionid；本篇文章将给大家介绍关于后端为node.js的微信小程序获取用户session_key,openid,unionid的方法实现。

步骤：

1、通过wx.login接口获取code既jscode，传递到后端；

2、后端请求

https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code

地址，就能获取到openid和unionid。

小程序接口promise化和封装

1、utils文件夹下创建wechat.js文件/** * Promise化小程序接口 */class Wechat {/*** 登陆* @return {Promise}*/static login() {return new Promise((resolve, reject) => wx.login({ success: resolve, fail: reject }));};/*** 获取用户信息* @return {Promise}*/static getUserInfo() {return new Promise((resolve, reject) => wx.getUserInfo({ success: resolve, fail: reject }));};/*** 发起网络请求* @param {string} url* @param {object} params* @return {Promise}*/static request(url, params, method = "GET", type = "json") {console.log("向后端传递的参数", params);return new Promise((resolve, reject) => {let opts = {url: url,data: Object.assign({}, params),method: method,header: { 'Content-Type': type },success: resolve,fail: reject}console.log("请求的URL", opts.url);wx.request(opts);});};/*** 获取微信数据,传递给后端*/static getCryptoData() {let code = "";return this.login().then(data => {code = data.code;console.log("login接口获取的code:", code);return this.getUserInfo();}).then(data => {console.log("getUserInfo接口", data);let obj = {js_code: code,};return Promise.resolve(obj);}).catch(e => {console.log(e);return Promise.reject(e);})};/*** 从后端获取openid* @param {object} params*/static getMyOpenid(params) {let url = 'https://xx.xxxxxx.cn/api/openid';return this.request(url, params, "POST", "application/x-www-form-urlencoded");};}module.exports = Wechat;2、修改小程序的app.js文件let wechat = require('./utils/wechat.js');App({onLaunch() {this.getUserInfo();},getUserInfo() {wechat.getCryptoData().then(d => {return wechat.getMyOpenid(d);}).then(d => {console.log("从后端获取的openid", d.data);}).catch(e => {console.log(e);})}})后端nodejs，是用的express命令行生成的项目框架，

1、创建common文件夹，创建utils文件，使用request模块请求接口，promise化requestconst request = require("request");class Ut {/*** promise化request* @param {object} opts* @return {Promise<[]>}*/static promiseReq(opts = {}) {return new Promise((resolve, reject) => {request(opts, (e, r, d) => {if (e) {return reject(e);}if (r.statusCode != 200) {return reject(`back statusCode：${r.statusCode}`);}return resolve(d);});})};};module.exports = Ut;2、新增路由，appId、secret在小程序的后台获取router.post("/openid", async (req, res) => {const Ut = require("../common/utils");try {console.log(req.body);let appId = "wx70xxxxxxbed01b";let secret = "5ec6exxxxxx49bf161a79dd4";let { js_code } = req.body;let opts = {url: `https://api.weixin.qq.com/sns/jscode2session?appid=${appId}&secret=${secret}&js_code=${js_code}&grant_type=authorization_code`}let r1 = await Ut.promiseReq(opts);r1 = JSON.parse(r1);console.log(r1);res.json(r1);}catch (e) {console.log(e);res.json('');}})结果：

这个返回结果没有unionid，按照官方的说法，需要在微信开放平台绑定小程序；

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