NodeJS：串行写入多个API调用的好方法

Question

在我的示例中，是否有更好/更漂亮的方法来依次调用多个API（依次）？

  var request = require('request');

  request('http://www.test.com/api1', function (error, response, body) {
    if (!error && response.statusCode == 200) {

      request('http://www.test.com/api1', function (error, response, body) {
        if (!error && response.statusCode == 200) {

          request('http://www.test.com/api1', function (error, response, body) {
            if (!error && response.statusCode == 200) {

              //And so on...

            }
          })

        }
      })

    }
  })

Answer 1

根据您使用的节点版本，Promise 应该是原生的......

https://nodejs.org/en/blog/release/v4.0.0/

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise

var request = require('request');

getRequest('http://www.test.com/api1').then(function (body1) {
    // do something with body1
    return getRequest('http://www.test.com/api2');
}).then(function (body2) {
    // do something with body2
    return getRequest('http://www.test.com/api3');
}).then(function (body3) {
    // do something with body3
    //And so on...
});

function getRequest(url) {
    return new Promise(function (success, failure) {
        request(url, function (error, response, body) {
            if (!error && response.statusCode == 200) {
                success(body);
            } else {
                failure(error);
            }
        });
    });
}