JavaScript 如果答案正确，则生成新字符串

Question

我有一个程序，可以随机生成两个数字(x 和 y)并要求用户将它们相乘。一旦他们将它们相乘，它就会告诉他们是对还是错。我遇到的问题是，如果他们得到正确的答案，它应该生成一组新的数字。我不确定如何让程序再次执行该功能。此外，无论他们答对还是错，它都必须清除答案字段。谢谢!

var x, y; // global variables for randomly generated numbers
var correct = ['Very good!', 'Excellent!', 'Correct - Nice work!', 'Correct - Keep up the good work!'];
var incorrect = ['No. please try again.', 'Wrong. Try once more.', 'Incorrect - Dont give up!', 'No - Keep trying.'];

// getting two random numbers between 1-12 then assigning them to x and y

function generateNumbers() {
    function aNumber() {
        return Math.floor((Math.random() * 12) + 1);
    }
    x = aNumber();
    y = aNumber();
}

// generating the question that will be used with the random numbers x and y
function genQuestion() {
    generateNumbers();
    document.getElementById('question').value = x + " times " + y;
}

// function that is performed when the button "check answer" is clicked. It will generate one of 4 answers depending 
//if it's right or wrong and will add 1 to the value of total. If it's incorrect it won't add anything
function buttonPressed() {
    var correctans = correct[Math.floor(Math.random() * 4)]; // randomly selecting an answer if it's correct
    var incorrectans = incorrect[Math.floor(Math.random() * 4)]; // randomly selecting an answer if it's incorrect
    var answer = document.getElementById('answer').value;

    if (answer == x * y) // correct
        {
            function genQuestion() {
                generateNumbers();
                document.getElementById('question').value = x + " times " + y;
            }
            window.alert(correctans);
            var total = document.getElementById('total').value++;
        }
    else {              // incorrect
        window.alert(incorrectans); 
    }
}

Answer 1

您没有调用 genQuestion 函数，重新定义它没有什么意义。

// function that is performed when the button "check answer" is clicked. It will generate one of 4 answers depending 
//if it's right or wrong and will add 1 to the value of total. If it's incorrect it won't add anything
function buttonPressed() {
    var correctans = correct[Math.floor(Math.random() * 4)]; // randomly selecting an answer if it's correct
    var incorrectans = incorrect[Math.floor(Math.random() * 4)]; // randomly selecting an answer if it's incorrect
    var answer = document.getElementById('answer').value;

    if (answer == x * y) // correct
        {
            //call genQuestion to create new question
            genQuestion(); 
            window.alert(correctans);
            var total = parseInt(document.getElementById('total').value)++;
        }
    else {              // incorrect
        window.alert(incorrectans); 
    }
    //clear 'answer' field
    document.getElementById('answer').value = '';
}