在node.js中定义JSON

Question

所以我想在node.js中做一个Alexa技能 - 但是，我似乎无法弄清楚如何定义json元素。我需要加入所有元素，在这种情况下，他们是来自新闻API的标题。我有他们所有console.logg'ed和它的作品，但我需要做的是弄清楚如何使“标题”变量。我怎样才能让“title”变量包含JSON文件中的所有标题。这里是我的代码：

var Alexa = require('alexa-sdk'); 
var request = require('request'); 

var APP_ID = "amzn1.ask.skill.36267067-d40c-460c-b07b-cc603b97be1b"; 
var url = "https://newsapi.org/v1/articles?source=googlenews&sortBy=top&apiKey=6e23e1ddb67e40cb93cf147718f18e36"; 


var handlers = { 
    'LaunchRequest': function() { 
     this.emit('NewsIntent'); 
    }, 

    // Get titles from JSON URL & Output it 
    'NewsIntent': function() { 

     request({ 
      url: url, 
      json: true 
     }, function (error, response, body) { 

      if (!error && response.statusCode === 200) { 
      console.log(body.articles[0].title); 
      console.log(body.articles[1].title); 
      console.log(body.articles[2].title); 
      console.log(body.articles[3].title); 
      console.log(body.articles[4].title); 
      console.log(body.articles[5].title); 
      console.log(body.articles[6].title); 
      console.log(body.articles[7].title); 
      console.log(body.articles[8].title); 
      console.log(body.articles[9].title); 

///// I need help here!!!!! ----> 
     /// need to define title, so I can speech emit it below. 

      this.emit(':tellWithCard', title.join('')); 

      } 
     }); 

    } 
}; 


exports.handler = function(event, context, callback) { 
    var alexa = Alexa.handler(event, context); 
    alexa.APP_ID = APP_ID; 
    alexa.registerHandlers(handlers); 
    alexa.execute(); 
}; 

Answer 1

遍历articles阵列map那么他们可以在以后加入。

var titles = body.articles.map(function(article) { 
    return article.title; 
}); 

注意：如果任何标题未定义，将显示在连接中。

UPDATE：基于对您的评论的要点，你可以这样做：

var handlers = { 
    'LaunchRequest': function() { 
    this.emit('NewsIntent'); 
    }, 

    // Get titles from JSON URL & Output it 
    'NewsIntent': function() { 

    request({ 
     url: url, 
     json: true 
    }, function(error, response, body) { 
     var titles; 
     if (!error && response.statusCode === 200) { 
     console.log(body.articles[0].title); 
     console.log(body.articles[1].title); 
     console.log(body.articles[2].title); 
     console.log(body.articles[3].title); 
     console.log(body.articles[4].title); 
     console.log(body.articles[5].title); 
     console.log(body.articles[6].title); 
     console.log(body.articles[7].title); 
     console.log(body.articles[8].title); 
     console.log(body.articles[9].title); 

     titles = body.articles.map(function(article) { 
      return article.title; 
     }); 

     this.emit(':tellWithCard', titles.join('')); 
     } 
    }); 

    } 
};