Question

我正在编写一个执行GET请求并返回结果的小程序，该程序可以正常工作。 Homewer，我无法管理如何获取userShortEmail的值（当我调用getUserInfo(session)函数时，它总是返回undefined（应该返回一个String。我尝试了超时和回调，但到目前为止还没有运气。

你能帮我吗？谢谢

function callWebsite(session, args, next) {
        var userShortEmail = "";
        
        userShortEmail = getUserInfo(session);
        
        
        var x = session.message.text.split(" ").pop();
        x = jiraIssue.substring(0, jiraIssue.length - 1);
        session.sendTyping();
        setTimeout(function () {

            var options = putHeader('/bikes/yellow' + x, "GET", userShortEmail);

            function callback(error, response, body) {
                var info = JSON.parse(body);
                if (!error && response.statusCode == 200) {
                    session.endDialog(issueDetails(info));
                }
                else {
                    session.endDialog(info.errorMessages);
                }
            }
            request(options, callback);
                    
        }, 300);

    }

编辑：这是getUserInfo函数的序幕：

function getUserInfo(session) {
    setTimeout(function () {
    var conversationId = session.message.address.conversation.id;
    

    connector.fetchMembers(session.message.address.serviceUrl, conversationId, function (err, result) {
        if (err) {
            console.log('There is some error');
        }
        else {
            result.forEach(function (result) {
                if (session.message.user.id === result.id) {
                    console.log("User is " + result.userPrincipalName);
                    return result.userPrincipalName;
                }
            });
        }
    });
    }, 3000);
}

Answer 1

好吧，我对工作有些无聊，因此决定在这里帮助您。您正在各处调用异步函数，而不是在继续之前等待响应。因此，我继续进行了转换，将您的代码转换为使用Promise来等待异步方法的响应，然后再继续。您可以改用async / await，但这取决于您，这只是互联网上一些随机兄弟的一个示例。

function getUserInfo(session) {
  return new Promise(function(resolve, reject) {
    let conversationId = session.message.address.conversation.id;

    connector.fetchMembers(session.message.address.serviceUrl, session.message.address.conversation.id, function(err, result) {
      if (err) {
        reject(err);
      } else {
        let ret;

        result.forEach(function(result) {
          if (session.message.user.id === result.id) {
            // set the return value
            result = result.userPrincipalName;
            // return false to break out of the loop
            return false;
          }
        });

        resolve(ret);
      }
    });

  });
}

function getYellowBikeDetails(userShortEmail, xParam) {
  return new Promise(function(resolve, reject) {
    var options = putHeader('/bikes/yellow' + x, "GET", userShortEmail);

    request(options, function(error, response, body) {
      var info = JSON.parse(body);

      if (!error && response.statusCode == 200) {
        resolve(issueDetails(info));
      } else {
        reject(info.errorMessage);
      }
    });

  });
}

function callWebsite(session, args, next) {

  getUserInfo(session)
    .catch((err) => console.log(err)) // something went wrong here, do your error handling
    .then((userShortEmail) => {
      // you need to check and make sure userShortEmail was found and is not undefined.
      var x = session.message.text.split(" ").pop();
      x = jiraIssue.substring(0, jiraIssue.length - 1);
      session.sendTyping();

      getYellowBikeDetails(userShortEmail, x)
        .catch((err) => console.log(err)) // something went wrong here, do your error handling
        .then((response) => {
          session.endDialog(response);
        });
    });
}

Node JS函数执行顺序

1 个答案: