微信小程式如何取得使用者session_key,openid,unioni（程式碼）-小程式開發-PHP中文網

微信小程式中取得使用者session_key,openid,unioni，這是小程式中常可以看到的功能，那麼如何實作小程式取得session_key,openid和unionid；本篇文章將介紹給大家介紹後端為node.js的微信小程式取得使用者session_key,openid,unionid的方法實作。

步驟：

1、透過wx.login介面取得code既jscode，傳遞到後端；

2 、後端請求

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

#」位址，就能取得到openid和unionid 。

小程式介面promise化與封裝

#1、utils資料夾下建立wechat.js檔案

/**
 * 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: { &#39;Content-Type&#39;: 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 = &#39;https://xx.xxxxxx.cn/api/openid&#39;;
    return this.request(url, params, "POST", "application/x-www-form-urlencoded");
  };
}
module.exports = Wechat;

登入後複製

2、修改小程式的app.js檔案

let wechat = require(&#39;./utils/wechat.js&#39;);
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);
      })
  }
})

登入後複製

後端nodejs，是用的express命令列產生的專案框架，

1、建立common資料夾，建立utils文件，使用request模組請求接口，promise化request

const 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;

登入後複製

2、新增路由，appId、secret在小程式的後台取得

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(&#39;&#39;);
  }
})