如何在javascript中將消息附加/更新到單個警報消息？

Question

我正在嘗試將整個結果一次打印到單個警報消息上。 我試圖用相同的變量answerText將其放入其中，但是它不起作用。 我嘗試向所有人添加警報，然后單獨彈出。 任何人都知道如何將所有結果放入單個警報消息，而不是所有地方？ 現在，代碼不顯示任何警告框。 謝謝！

JavaScript的：

var ans = new Array;
var done = new Array;
var yourAns = new Array;
//var explainAnswer = new Array;

var score = 0;
ans[1] = "D";
ans[2] = "A";
ans[3] = "D";
ans[4] = "A";
ans[5] = "B";

function Engine(question, answer) 
{
yourAns[question] = answer;
}

function Score()
{
alert("TESTING!");
var answerText = "How did you do?\n------------------------------------\n";
for(i = 1; i <= 5; i++)
{
    answerText = answerText + "\nQuestion :" + i + "\n";
    if(ans[i] != yourAns[i])
    {
        answerText = answerText + "\nThe correct answer was " + ans[i];
    }
    else
    {
        answerText = answerText + " \nCorrect! \n";
        score++;
    }
}
answerText = answerText + "\n\nYour total score is : " + score + "\n";
 }

Answer 1

嘗試

 function Score()
    {
    alert("TESTING!");
    var answerText = "How did you do?\n------------------------------------\n";
    for(i = 1; i <= 5; i++)
    {
        answerText = answerText + "\nQuestion :" + i + "\n";
        if(ans[i] != yourAns[i])
        {
            answerText = answerText + "\nThe correct answer was " + ans[i];
        }
        else
        {
            answerText = answerText + " \nCorrect! \n";
            score++;
        }
    }
    answerText = answerText + "\n\nYour total score is : " + score + "\n";
    alert(answerText );

 }

Answer 2

您的代碼有兩個問題

• 您聲明了一個函數Score但從未調用它。
• answerText已創建但您從未將其值傳遞給警報。

var ans = new Array;
var done = new Array;
var yourAns = new Array;
//var explainAnswer = new Array;

var score = 0;
ans[1] = "D";
ans[2] = "A";
ans[3] = "D";
ans[4] = "A";
ans[5] = "B";

function Engine(question, answer) 
{
yourAns[question] = answer;
}

function Score()
{
alert("TESTING!");
var answerText = "How did you do?\n------------------------------------\n";
for(i = 1; i <= 5; i++)
{
    answerText = answerText + "\nQuestion :" + i + "\n";
    if(ans[i] != yourAns[i])
    {
        answerText = answerText + "\nThe correct answer was " + ans[i];
    }
    else
    {
        answerText = answerText + " \nCorrect! \n";
        score++;
    }
}
answerText = answerText + "\n\nYour total score is : " + score + "\n";
    // shows an alert
    alert(answerText);
 }
// call a Score function
Score();