具有Q和As的多维数组

Question

我正在学习使用HTML，CSS和Javascript构建网页。我计划使用该页面显示3个随机问题，并选择3个答案，其中之一就是正确答案。在15个问题中选择3个随机问题。我已经有以下脚本，但是我希望每个随机问题都显示为每个问题分配3个答案。

var display = document.getElementById("questions");
var questions = ['What color is the sky?',
            'What sound does a cow make?',
            'How many stars are on the US flag?',
            'How mad is Max?',
            'Is this another question?'];

var questionTracker = [];
var questionAmount = 3;

// Iterate however many times
for (var i = 0; i < questionAmount; i++) {
  // Keep creating random numbers until the number is unique
do {
  var randomQuestion = Math.floor(Math.random() * questions.length);
} while (existingQuestions());

display.innerHTML += questions[randomQuestion] + '<br>';
  // Add the question to the tracker
  questionTracker.push(randomQuestion);
}

// If the current random number already exists in the tracker, return true
function existingQuestions() {
  for (var i = 0; i < questionTracker.length; i++) {
    if (questionTracker[i] === randomQuestion) {
      return true;
    }
  }
  return false;
}