Javascript 问答游戏 - 从数组中的八个问题中随机抽取四个问题

Question

我正在尝试创建一个 JavaScript 测验。我遵循了这个 YouTube 教程:1 , 2 。我想做的是从数组中的 8 个中随机选择 4 个问题。我的 JavaScript 代码是:

var currentQuestion = 0;
var score = 0;
var totQuestions = questions.length;

var container = document.getElementById("quizContainer");
var questionEl = document.getElementById("question");
var opt1 = document.getElementById("opt1");
var opt2 = document.getElementById("opt2");
var opt3 = document.getElementById("opt3");
var opt4 = document.getElementById("opt4");
var nextButton = document.getElementById("nextButton");
var resultCont = document.getElementById("result");

function loadQuestion (questionIndex) {
    var q = questions[questionIndex];
    questionEl.textContent = (questionIndex + 1) + ". " + q.question;
    opt1.textContent = q.option1;
    opt2.textContent = q.option2;
    opt3.textContent = q.option3;
    opt4.textContent = q.option4;
};

function loadNextQuestion () {
    var selectedOption = document.querySelector("input[type=radio]:checked");
    if(!selectedOption) {
        alert("Please select your answer!");
        return;
    }
    var answer = selectedOption.value;
    if(questions[currentQuestion].answer == answer) {
        score ++;
    }
    selectedOption.checked = false;
    currentQuestion++;
    if(currentQuestion == totQuestions - 1) {
        nextButton.textContent = "Finish";
    }
    if(currentQuestion == totQuestions) {
        container.style.display = "none";
        resultCont.style.display = "";
        resultCont.textContent = "Your Score: " + score;
        return;
    }
    loadQuestion(currentQuestion);
}

loadQuestion(currentQuestion);

我尝试使用 math.random() 但我唯一能做的就是生成随机数，而不是从数组中生成随机问题。
包含问题的数组如下所示:

{
    "question": "This is question 3",
    "option1": "A",
    "option2": "B",
    "option3": "C",
    "option4": "D",
    "answer": "2"
},
{
    "question": "This is question 4",
    "option1": "A",
    "option2": "B",
    "option3": "C",
    "option4": "D",
    "answer": "1"
}

提前谢谢您。

Answer 1

下面的代码将从数组中随机获取一个项目:

var randomQ = questions[Math.round((Math.random()*questions.length)+1)];