基于随机数记录对象的数学函数

Question

如果数学函数是 0、1 或 2，我想获得基于某事物的当前值。有时它只是想让我写它来做。使用 Quokka 我可以看到它记录的内容，但是当它不能正确执行时会发生两个错误之一。它要么记录“无法读取未定义的属性'答案'”，要么即使 random() 的值已更改，它也会记录相同的值。我只是想弄清楚它为什么会这样。

function question(q, answersArr) {
        this.question = q,
        this.answers = answersArr
}

let questionOne = new question("Question One?", ["Answer One", "Answer Two", "Answer Three"]);
let questionTwo = new question("Question Two?", ["Answer Four", "Answer Five", "Answer Six"]);
let questionThree = new question("Question Three?", ["Answer Seven", "Answer Eight", "Answer Nine"]);

let questionArr = [questionOne, questionTwo, questionThree];

let random = function() {
    let randoNum = Math.random() * 3;
    let roundedNum = Math.floor(randoNum);
    return roundedNum
};

console.log(random());

let current;
if (random() === 0) {
    current = array['0']
} else if (random() === 1) {
    current = array["1"]
} else if (random() === 2) {
    current = array['2']
}

console.log(current.answers);
console.log(current);

Answer 1

每次您拨打random() 时，您都会生成一个新 随机数。因此，如果偶然每个随机数与您正在测试的当前数字不匹配，current 将永远不会被分配到。

只调用一次random()，将其保存在一个变量中，然后检查该变量。

您还必须引用问题数组的名称，即questionArr，而不是array。

function question(q, answersArr) {
        this.question = q,
        this.answers = answersArr
}

let questionOne = new question("Question One?", ["Answer One", "Answer Two", "Answer Three"]);
let questionTwo = new question("Question Two?", ["Answer Four", "Answer Five", "Answer Six"]);
let questionThree = new question("Question Three?", ["Answer Seven", "Answer Eight", "Answer Nine"]);

let questionArr = [questionOne, questionTwo, questionThree];

let random = function() {
    let randoNum = Math.random() * 3;
    let roundedNum = Math.floor(randoNum);
    return roundedNum
};

const randIndex = random();
console.log(randIndex);

let current;
if (randIndex === 0) {
    current = questionArr['0']
} else if (randIndex === 1) {
    current = questionArr["1"]
} else if (randIndex === 2) {
    current = questionArr['2']
}

console.log(current.answers);
console.log(current);

此外，如果您愿意，您的代码可以显着缩减：

function question(q, answersArr) {
        this.question = q,
        this.answers = answersArr
}
const questionOne = new question("Question One?", ["Answer One", "Answer Two", "Answer Three"]);
const questionTwo = new question("Question Two?", ["Answer Four", "Answer Five", "Answer Six"]);
const questionThree = new question("Question Three?", ["Answer Seven", "Answer Eight", "Answer Nine"]);
const questionArr = [questionOne, questionTwo, questionThree];
const random = () => Math.floor(Math.random() * 3);
const randIndex = random();
console.log(randIndex);
const current = questionArr[randIndex];
console.log(current.answers);
console.log(current);