javascript - 使用javascript获取title属性

Question

我是 JavaScript 的新手，我正在从事一个使用面部识别来检测情绪的项目。面部识别部分正在检测情绪，但我需要访问由此产生的情绪。面部识别 API 不断反馈，结果在 "div"id= results 标签下不断变化

<div id="results" style="word-wrap:break-word;">
<span> Timestamp: 93.12 </span>
<br>
<span>Number of faces found: 1</span>
<br>
<span> Appearance: {"gender":"Male","glasses":"Yes","age":"25 - 34","ethnicity":"Black African"}</span><br><span>Emotions: {"joy":0,"sadness":0,"disgust":1,"contempt":0,"anger":0,"fear":0,"surprise":0,"valence":0,"engagement":0}
</span>
<br>
<span> Emoji: 
<img class="chromoji" title="Neutral Face" alt=":neutral_face:"     src="chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/apple/1f610.png"></span>
<br>
</div>

标题“Neutral Face”或alt是需要的主导情绪的属性之一

我尝试使用来自

的解决方案

Extract property of a tag in HTML using Javascript和 How to get title attribute from link within a class with javascript

在我的实际代码中

<div id="results" style="word-wrap:break-word;">
               <script>
                 //var images = document.querySelectorAll('img');
                 var emotion = document.getElementByTagName("img")[0].getAttributes("title");
                 console.log(emotion)
               </script>
             </div>

我尝试在生成结果的 JS 文件中使用此片段中的最后两行代码:

detector.addEventListener("onImageResultsSuccess", function(faces, image, timestamp) {
  $('#results').html("");
  log('#results', "Timestamp: " + timestamp.toFixed(2));
  log('#results', "Number of faces found: " + faces.length);
  if (faces.length > 0) {
    log('#results', "Appearance: " + JSON.stringify(faces[0].appearance));
    log('#results', "Emotions: " + JSON.stringify(faces[0].emotions, function(key, val) {
      return val.toFixed ? Number(val.toFixed(0)) : val;
    }));
    log('#results', "Emoji: " + faces[0].emojis.dominantEmoji);
    drawFeaturePoints(image, faces[0].featurePoints);
    var motion =  faces[0].emojis.dominantEmoji;
    log('#results', motion);
  }
});

另外，我将此添加到需要情感识别反馈的 JavaScript 文件中

var tag = document.getElementByTagName("img")
      var emotion= tag.getAttribute("title");
      console.log(emotion);

同样在另一个单独的试验中，我在索引 html 文件中做了这个

<script type="text/javascript">
                var image = document.getElementsByTagName("img")[0];
                var title = image.getAttribute("title");
                console.log(title); // shows the value of title for the element "image"
              </script>

该项目的主要思想是检测用户的情绪并根据该情绪播放音乐

Answer 1

你可以试试这个:

<script type="text/javascript">
    var image = document.getElementsByTagName("img")[0];
    var title = image.getAttribute("title");

    console.log(title); // shows the value of title for the element "image"
</script>

在此处查看演示:http://codepen.io/anon/pen/vyVQBJ