如何在 javascript 中将消息附加/更新到单个警报消息？答案

【问题标题】：How do I append/update a message to a single alert message in javascript?如何在 javascript 中将消息附加/更新到单个警报消息？
【发布时间】：2013-11-20 07:49:07
【问题描述】：

我正在尝试将整个结果一次打印到一条警报消息上。我试图将它与相同的变量 answerText 一起打印，但它不起作用。我尝试向所有这些添加警报，它会单独弹出。任何人都知道如何将所有结果放入单个警报消息中，而不是所有地方？现在，代码没有显示任何警告框。谢谢！

JavaScript：

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";
 }

【问题讨论】：

将所有内容添加到answerText 并在for 循环之后提醒它。
什么是“不起作用”？
Right now, the code doesn't show any alert boxes，那是因为你在循环之后没有写alert(answerText);。
@abhitalks 更新：现在一切正常。感谢您的提示。

标签： javascript arrays html forms alert

【解决方案1】：

试试

 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 );

 }

【讨论】：

感谢您的快速回复！知道了！不敢相信就这么简单！

【解决方案2】：

您的代码有两个问题

您声明了一个函数 Score，但从未调用它。
answerText 已创建，但您从未将其值传递给警报。

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();

【讨论】：