NodeJS是异步的，我的代码不按我期望的顺序运行

  postRegistrationHandler: function (account, req, res, next) {
    console.log('postRegistrationHandler activated');
    account.getCustomData(function(err, data) {
      if (err) {
        console.log(err.toString, "error string");
        return next(err);
      } else {
        data.mongo_id = userCreationCtrl(account);
        data.save();
        next();
      }
    });
  },
  postRegistrationHandler: function (account, r