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Question

我无法理解如何将单个Promise调整为一系列Promise,一旦两个API调用都返回,它就会解析.

如何将下面的代码重写为Promises链？

function parseTweet(tweet) {  
  indico.sentimentHQ(tweet)
  .then(function(res) {
     tweetObj.sentiment = res;
     }).catch(function(err) {
    console.warn(err);
  });

  indico.organizations(tweet)
  .then(function(res) {
     tweetObj.organization = res[0].text;
     tweetObj.confidence = res[0].confidence;
     }).catch(function(err) {
    console.warn(err);
  });
}

谢谢.

Answer 1

如果您希望调用同时运行,那么您可以使用Promise.all.

Promise.all([indico.sentimentHQ(tweet), indico.organizations(tweet)])
  .then(values => {
    // handle responses here, will be called when both calls are successful
    // values will be an array of responses [sentimentHQResponse, organizationsResponse]
  })
  .catch(err => {
    // if either of the calls reject the catch will be triggered
  });