数组不是数组

Question

我有一个看起来像数组的对象

var questions = 

[ { started_time: 2017-05-04T12:46:39.439Z,
    word: 'bottle',
    questionId: '161013bd-00cc-4ad1-8f98-1a8384e202c8' },
  { started_time: 2017-05-04T12:47:26.130Z,
    word: 'play',
    questionId: 'a84bd1b4-8b9c-4ec7-862d-ba994ac1f371' },
  { started_time: 2017-05-04T12:47:50.156Z,
    word: 'bottle',
    questionId: '4c7e1ee8-651e-4086-8e69-ce64414a815a' },
  { started_time: 2017-05-04T12:54:40.703Z,
    word: 'was',
    questionId: '79412420-eee9-47e0-8fb8-d854c5889765' },
  { started_time: 2017-05-04T12:55:36.474Z,
    word: 'liked',
    questionId: '525d90c9-4cca-433c-99c5-56bb54756b9c' } ]

我试图创建一个像这样的单词数组：

["bottle", "play", "was", "liked"]

当我尝试使用questions.map（等等）时，我得到了

TypeError: questions.map is not a function

和Array.isArray（questions）为false

我无法弄清楚为什么我不能将其视为数组。任何帮助将不胜感激。

Answer 1

var question = [ 
            { 
            started_time: '2017-05-04T12:46:39.439Z',
            word: 'bottle',
            questionId: '161013bd-00cc-4ad1-8f98-1a8384e202c8' 
            },
            {
            started_time: `2017-05-04T12:47:26.130Z`,
            word: 'play',
            questionId: 'a84bd1b4-8b9c-4ec7-862d-ba994ac1f371'
            }
          ];


//console.log(JSON.stringify(question) + "<br>");

var result = question.map(function(x){
  return x.word;
});

console.log(result);