微信的OpenID和unionid区别

function getUserInfo(callback){
     // 如果认证的code存在
     if (params.code) {
         const code = encodeURIComponent(params.code);
         const data = {
             mchId: 'WX001',
             code,
         };
         const _params = new Params(params);
         delete _params.code;
         history.replaceState(null, null, _params);
         $loader.show();
         request('/node_api/user.do?fn=wxUserInfo', 'GET', data).then((res) => {
             $loader.hide();
             if (res.code === 0){
                 const userInfo = {};
                 try {
                     userInfo.wxInfo = res.content.userinfo || {};
                     userInfo.isbind = res.content.isBind;
                     userInfo.channelUserId = res.content.channelUserId;
                 } catch (ex) {
                     userInfo.wxInfo = {};
                     userInfo.isbind = false;
                 }
                 if (!userInfo.isbind) {
                     const userToken = {
                         accessToken: res.content.accessToken || '',
                         channelId: res.content.channelId || '',
                         channelUserId: res.content.channelUserId || '',
                         unionId: res.content.unionId || ''
                     };
                 // 将userToken写入cookie
                 document.cookie = 'userToken=' + encodeURIComponent(JSON.stringify(userToken));
             }
             callback(userInfo);
         }else{
             // 请求sso/login接口失败，弹提示信息
             showTextMessage(res.msg);
         }}, () => {
             $loader.hide();
             showTextMessage('网络异常，请稍后再试');
             deleteCode();
         });
     }else{
         // 无code 则进行微信认证
         authorize();
     }
 }