Question

我的if / else语句直接转到其他地方，我似乎无法弄明白为什么。这是我的代码：

var sentiment = require ('sentiment');
var twitterSentiment;
var geoColor;
var results; 
var twit = new twitter({
    consumer_key: credentials.consumer_key,
    consumer_secret: credentials.consumer_secret,
    access_token_key: credentials.access_token_key,
    access_token_secret: credentials.access_token_secret
});

twit.stream(
    'statuses/filter',
    { 'locations': location },
    function(stream) {
        stream.on('data', function(tweet) {
            console.log(tweet.text);
            results = sentiment (tweet.text);  
            twitterSentiment = results;


            //Comparison of Sentiment Scores 
              if (twitterSentiment == 0) {
                geoColor = '#B5B5B5';
               } 

            else if (twitterSentiment < 0) {
                geoColor = '#FC0828';
            } 
            else {
                geoColor = '#00DE1E';
            }

             console.log (geoColor);         
        });
    });

这是一个示例输出：

 omg yes!!
#00DE1E
Do you think will actually understand? I want to ask mine the same question. Just not sure I'm ready to have that conversation.
#00DE1E
 A thing of beauty by:
 @youtube
#00DE1E
do you still do this??
#00DE1E

正如您所看到的，只有一种颜色可以识别所有推文;几乎好像我的if/else语句没有正确实现？

当我将console.log (geoColor);更改为console.log (results);这是我的输出：

   omg yes!!
{ score: 1,
  comparative: 0.25,
  tokens: [ 'omg', 'yes' ],
  words: [ 'yes' ],
  positive: [ 'yes' ],
  negative: [] }

 Do you think will actually understand? I want to ask mine the same question. Just not sure I'm ready to have that conversation.
{ score: 1,
  comparative: 0.041666666666666664,
  tokens: 
   [ 
     'do',
     'you',
     'think',
     'will',
     'actually',
     'understand',
     'i',
     'want',
     'to',
     'ask',
     'mine',
     'the',
     'same',
     'question',
     'just',
     'not',
     'sure',
     'i\'m',
     'ready',
     'to',
     'have',
     'that',
     'conversation' ],
  words: [ 'want' ],
  positive: [ 'want' ],
  negative: [] }

A thing of beauty by:
 @youtube
{ score: 3,
  comparative: 0.25,
  tokens: 
   [ 'a',
     'thing',
     'of',
     'beauty',
     'by',
     'youtube', ],
  words: [ 'beauty' ],
  positive: [ 'beauty' ],
  negative: [] }

do you still do this??
{ score: 0,
  comparative: 0,
  tokens: 
  [
     'do',
     'you',
     'still',
     'do',
     'this' ],
  words: [],
  positive: [],
  negative: [] }

正如你所看到的，每条推文的个人情绪评分分别为1,1,3,0那么为什么我的if / else语句忽略了这些数字呢？

我可以在代码中更改哪些内容，以便我的if / else语句正确实现并考虑推文的情绪分数？我的目标是为每条推文输出合适的颜色。

Answer 1

您的var results是一个对象，包含许多其他属性。在javascript中，“if”子句将始终为非null对象实例返回“true”。将对象与数字进行比较时 - 任何非基本对象的实例都将返回1。

正如您所说，您想要比较score属性的值，因此您需要做的是在if子句中引用results.score。

更改为

 twitterSentiment = results.score;

应该解决你的问题。

Answer 2

您正在为结果对象设置twitterSentiment并比较整个对象而不仅仅是分数。将您的代码更改为：

if (twitterSentiment.score == 0) {
    geoColor = '#B5B5B5';
} 

else if (twitterSentiment.score < 0) {
    geoColor = '#FC0828';
} 
else {
   geoColor = '#00DE1E';
}

如果/ else语句直接转到else

2 个答案: