Question

var questions = [
    ['Whats 5 + 10? ', 15],
    ['Whats 5 + 15? ', 20],
    ['Whats 5 + 20? ', 25],
]
var questionsCorrect = [];
var questionsIncorrect = [];

var correct = 0;
var incorrect = 0;
var question; 
var answer;
var response; 
var html;

function print(message) {
    document.write(message);
}

for (var i = 0; i < questions.length; i++ ) {
    question = questions[i][0];
    answer = questions [i][1];
    response = parseInt(prompt(question));
    if (response === answer) {
    correct++;
    questionsCorrect = '<br> Answered correctly: </br>' + '<li>' + question + 

**'</li>';
    }   
    }
html = 'You answered ' + correct + ' question(s) correctly';
print(html);

document.write(questionsCorrect);

这里是初学者，也是第一次发给SO，所以请原谅我，如果我已将其弄糟了。我要在这里完成的所有操作都是显示用户正确和不正确的答案。我不明白为什么数组只返回该数组中的最后一项。我认为，一旦我弄清了这一点，其他所有内容都会落到位。预先感谢您的帮助！

Answer 1

根据我的评论，这里是“固定”代码：

var questions = [
  ['Whats 5 + 10? ', 15],
  ['Whats 5 + 15? ', 20],
  ['Whats 5 + 20? ', 25],
]
var questionsCorrect = [];
var questionsIncorrect = [];

var correct = 0;
var incorrect = 0;
var question;
var answer;
var response;
var html;

function print(message) {
  document.write(message);
}

for (var i = 0; i < questions.length; i++) {
  question = questions[i][0];
  answer = questions[i][1];
  response = parseInt(prompt(question));
  if (response === answer) {
    correct++;
    questionsCorrect += '<br> Answered correctly: </br>' + '<li>' + question + '</li>';
  }
}
html = 'You answered ' + correct + ' question(s) correctly';
print(html);

document.write(questionsCorrect);

请参阅@roccobarbi答案，因为它解决了根本问题，而不仅仅是这个特定问题。

Answer 2

您可以执行亚当·H（Adam H）在您的帖子下提到的操作，但是您正在为questionsCorrect分配一个空数组[]，所以我假设您希望它是一个数组。只需将正确答案“推入”其中即可。

questionsCorrect.push('<br> Answered correctly: </br>' + '<li>' + question + '</li>');

并显示它，只需执行以下操作：

document.write(questionsCorrect.join());

无法弄清楚如何显示数组中的所有元素

2 个答案: