微信小程序-获取用户session_key,openid,unionid - 后端为 nodejs
微信小程序-获取用户session_key,openid,unionid - 后端为nodejs8.0+
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
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/**
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* Promise化小程序接口
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*/
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class Wechat {
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/**
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* 登陆
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* @return {Promise}
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*/
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static login() {
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return new Promise((resolve, reject) => wx.login({ success: resolve, fail: reject }));
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};
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/**
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* 获取用户信息
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* @return {Promise}
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*/
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static getUserInfo() {
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return new Promise((resolve, reject) => wx.getUserInfo({ success: resolve, fail: reject }));
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};
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/**
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* 发起网络请求
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* @param {string} url
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* @param {object} params
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* @return {Promise}
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*/
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static request(url, params, method = "GET", type = "json") {
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console.log("向后端传递的参数", params);
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return new Promise((resolve, reject) => {
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let opts = {
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url: url,
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data: Object.assign({}, params),
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method: method,
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header: { 'Content-Type': type },
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success: resolve,
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fail: reject
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}
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console.log("请求的URL", opts.url);
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wx.request(opts);
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});
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};
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/**
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* 获取微信数据,传递给后端
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*/
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static getCryptoData() {
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let code = "";
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return this.login()
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.then(data => {
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code = data.code;
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console.log("login接口获取的code:", code);
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return this.getUserInfo();
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})
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.then(data => {
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console.log("getUserInfo接口", data);
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let obj = {
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js_code: code,
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};
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return Promise.resolve(obj);
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})
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.catch(e => {
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console.log(e);
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return Promise.reject(e);
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})
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};
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/**
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* 从后端获取openid
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* @param {object} params
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*/
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static getMyOpenid(params) {
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let url = 'https://xx.xxxxxx.cn/api/openid';
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return this.request(url, params, "POST", "application/x-www-form-urlencoded");
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};
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}
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module.exports = Wechat;
2、修改小程序的app.js文件
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let wechat = require('./utils/wechat.js');
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App({
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onLaunch() {
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this.getUserInfo();
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},
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getUserInfo() {
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wechat.getCryptoData()
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.then(d => {
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return wechat.getMyOpenid(d);
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})
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.then(d => {
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console.log("从后端获取的openid", d.data);
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})
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.catch(e => {
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console.log(e);
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})
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}
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})
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request
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const request = require("request");
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class Ut {
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/**
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* promise化request
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* @param {object} opts
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* @return {Promise<[]>}
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*/
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static promiseReq(opts = {}) {
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return new Promise((resolve, reject) => {
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request(opts, (e, r, d) => {
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if (e) {
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return reject(e);
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}
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if (r.statusCode != 200) {
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return reject(`back statusCode:${r.statusCode}`);
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}
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return resolve(d);
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});
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})
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};
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};
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module.exports = Ut;
2、新增路由,appId、secret在小程序的后台获取
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router.post("/openid", async (req, res) => {
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const Ut = require("../common/utils");
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try {
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console.log(req.body);
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let appId = "wx70xxxxxxbed01b";
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let secret = "5ec6exxxxxx49bf161a79dd4";
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let { js_code } = req.body;
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let opts = {
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url: `https://api.weixin.qq.com/sns/jscode2session?appid=${appId}&secret=${secret}&js_code=${js_code}&grant_type=authorization_code`
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}
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let r1 = await Ut.promiseReq(opts);
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r1 = JSON.parse(r1);
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console.log(r1);
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res.json(r1);
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}
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catch (e) {
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console.log(e);
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res.json('');
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}
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})
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;
如果需要解密和数据校验,请跳转这里。
参考地址:
https://mp.weixin.qq.com/debug/wxadoc/dev/api/api-login.html
https://mp.weixin.qq.com/debug/wxadoc/dev/api/uinionID.html