上传的code参数{code: "aIjeGwUzRsr67XtSQsEHLy5LG573jaCRLkUF-uQUd9A", errMsg: "qy.login:ok"}
//小程序的调用code2session接口 
 let p = new Promise((resolve, reject) => {
    wx.getSystemInfo({
      success(res){
        if(res.environment=='wxwork'){
          wx.qy.login({
            success:res=>{
              console.log(res)
              wx.request({
                url: "https://api.bb-pco.com/API/sys/wxwork_login.php",
                data:{
                  code:res.code,
                  type:1
                },
                success(res) {
                  //console.log(res)
                  resolve(res);
                }
              })
            }
          })
        }else{
          wx.login({
            success:res=>{
              //console.log(res)
              wx.request({
                url: "https://api.bb-pco.com/API/sys/wxxcx_login.php",
                data:{
                  code:res.code,
                  type:1,
                },
                success(res) {
                  //console.log(res)
                  resolve(res);
                }
              })
            }
          })
        }
      }
    })
  })
  return p
};

//后端接口方法

public function get_wxwork_userid($code,$token){
  $url="https://qyapi.weixin.qq.com/cgi-bin/miniprogram/jscode2session?access_token=$token&js_code=$code&grant_type=authorization_code";
  $res=get($url);
  $res=json_decode($res,'true');
  return $res;
}

返回的结果

{
  "code": 202,
  "data": {
    "errcode": 40029,
    "errmsg": "invalid code, hint: [1600762993_51_325fa7f2f75904589360afc84be45faf], from ip: 47.98.147.218, more info at https://open.work.weixin.qq.com/devtool/query?e=40029",
    "code": "gLZO0UONp4Rd8UWgMlogAFLTdRhysHpuN1kD14wg81I"
  },
  "err": "获取userid出错"
}