微信小程序获取unionid

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UniqueIDopenidencryptedData

官网提供了解密的算法，将nodejs的版本拿过来稍作修改即可

decode.js

//utils/decode.js
var Crypto = require('./cryptojs/cryptojs.js').Crypto;

function WXBizDataCrypt(appId, sessionKey) {
  this.appId = appId
  this.sessionKey = sessionKey
}

WXBizDataCrypt.prototype.decryptData = function (encryptedData, iv) {
  // base64 decode ：使用 CryptoJS 中 Crypto.util.base64ToBytes()进行 base64解码
  var encryptedData = Crypto.util.base64ToBytes(encryptedData)
  var key = Crypto.util.base64ToBytes(this.sessionKey);
  var iv = Crypto.util.base64ToBytes(iv);

  // 对称解密使用的算法为 AES-128-CBC，数据采用PKCS#7填充
  var mode = new Crypto.mode.CBC(Crypto.pad.pkcs7);

  try {
    // 解密
    var bytes = Crypto.AES.decrypt(encryptedData, key, {
      asBpytes: true,
      iv: iv,
      mode: mode
    });

    var decryptResult = JSON.parse(bytes);

  } catch (err) {
    console.log(err)
  }

  if (decryptResult.watermark.appid !== this.appId) {
    console.log(err)
  }

  return decryptResult
}

module.exports = WXBizDataCrypt

var WXBizDataCrypt = require('utils/decode.js');

var AppId = 'XXXXXX'  
var AppSecret = 'XXXXXXXXX'

//app.js
App({
  onLaunch: function () {
    //调用登录接口
      wx.login({
        success: function (res) {
          wx.request({
            url: 'https://api.weixin.qq.com/sns/jscode2session',
            data: {
              appid: AppId,
              secret: AppSecret,
              js_code: res.code,
              grant_type: 'authorization_code'
            },
            header: {
              "Content-Type": "application/x-www-form-urlencoded"
            },
            method: 'GET',
            success: function(res) {
              var pc = new WXBizDataCrypt(AppId, res.data.session_key)
              wx.getUserInfo({
                success: function (res) {
                  var data = pc.decryptData(res.encryptedData, res.iv)
                  console.log('解密后 data: ', data)
                }
              })
            },
            fail: function(res) {
            }
          })
        }
      })
  }
})