微信小程序-获取用户session_key,openid,unionid - 后端为nodejs_nodejs 获取微信小程序sessionid-优快云博客

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

/**

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

1、创建common文件夹，创建utils文件，使用request模块请求接口，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);
    });
})
};

  
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};

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：