微信小程序util.js里写登录的方法返回的结果怎么是undefined？

Question

我把这个登录方法现在util.js里，调用后出来的结果是undefined，我能这么写吗？

function wxlogin () {
  wx.login ({
    success: function (res) {
      let code = res.code;
      if (code) {
        wx.getUserInfo({
          success: function (res) {
            wx.request ({
              url: run_url + "weixin/getUserInfo",
              header: {
                'content-type': 'application/json'
              },
              data: {
                encryptedData: res.encryptedData,
                iv: res.iv,
                code: code
              },
              success: function (res) {
                let userContent = res.data.userContent;
                if (userContent == '' || userContent == undefined) {
                  console.log("login error!");
                }
                else {
                  var openId = userContent.openId;
                  var sessionKey = userContent.sessionKey;
                  var userId;
                  if (res.data.status) {
                    userId = userContent.userId;
                  }
                  else {
                    userId = ''
                  }
                  return {
                    openId: openId,
                    sessionKey: sessionKey,
                    userId: userId
                  }
                }
              },
              fail: function (err) {
                console.log("login error!");
                return false;
              }
            })
          },
          fail: function (err) {
            console.log("user has not authorized to USERINFO yet!");
            return false;
          }
        })
      }
      else {
        console.log("err");
        return false;
      }
    },
    fail: function (err) {
      console.log("err");
      return false;
    }
  })
}

Answer 1

return怎么能那样写 ，赋值要用等于号 那种写法不是setData？