Question

我正在使用以下测验问题。问题没有显示出来。我将我的代码放在以下链接中。

(function() {
  var questions = [{
    question: "What is 2*5?",
    choices: [2, 5, 10, 15, 20],
    correctAnswer: 2
  }, {
    question: "What is 3*6?",
    choices: [3, 6, 9, 12, 18],
    correctAnswer: 4
  }, {
    question: "What is 8*9?",
    choices: [72, 99, 108, 134, 156],
    correctAnswer: 0
  }, {
    question: "What is 1*7?",
    choices: [4, 5, 6, 7, 8],
    correctAnswer: 3
  }, {
    question: "What is 8*8?",
    choices: [20, 30, 40, 50, 64],
    correctAnswer: 4
  }];

  var questionCounter = 0; //Tracks question number
  var selections = []; //Array containing user choices
  var quiz = $('#quiz'); //Quiz div object

  // Display initial question
  displayNext();

  // Click handler for the 'next' button
  $('#next').on('click', function(e) {
    e.preventDefault();

    // Suspend click listener during fade animation
    if (quiz.is(':animated')) {
      return false;
    }
    choose();

    // If no user selection, progress is stopped
    if (isNaN(selections[questionCounter])) {
      alert('Please make a selection!');
    } else {
      questionCounter++;
      displayNext();
    }
  });

  // Click handler for the 'prev' button
  $('#prev').on('click', function(e) {
    e.preventDefault();

    if (quiz.is(':animated')) {
      return false;
    }
    choose();
    questionCounter--;
    displayNext();
  });

  // Click handler for the 'Start Over' button
  $('#start').on('click', function(e) {
    e.preventDefault();

    if (quiz.is(':animated')) {
      return false;
    }
    questionCounter = 0;
    selections = [];
    displayNext();
    $('#start').hide();
  });

  // Animates buttons on hover
  $('.button').on('mouseenter', function() {
    $(this).addClass('active');
  });
  $('.button').on('mouseleave', function() {
    $(this).removeClass('active');
  });

  // Creates and returns the div that contains the questions and 
  // the answer selections
  function createQuestionElement(index) {
    var qElement = $('<div>', {
      id: 'question'
    });

    var header = $('<h2>Question ' + (index + 1) + ':</h2>');
    qElement.append(header);

    var question = $('<p>').append(questions[index].question);
    qElement.append(question);

    var radioButtons = createRadios(index);
    qElement.append(radioButtons);

    return qElement;
  }

  // Creates a list of the answer choices as radio inputs
  function createRadios(index) {
    var radioList = $('<ul>');
    var item;
    var input = '';
    for (var i = 0; i < questions[index].choices.length; i++) {
      item = $('<li>');
      input = '<input type="radio" name="answer" value=' + i + ' />';
      input += questions[index].choices[i];
      item.append(input);
      radioList.append(item);
    }
    return radioList;
  }

  // Reads the user selection and pushes the value to an array
  function choose() {
    selections[questionCounter] = +$('input[name="answer"]:checked').val();
  }

  // Displays next requested element
  function displayNext() {
    quiz.fadeOut(function() {
      $('#question').remove();

      if (questionCounter < questions.length) {
        var nextQuestion = createQuestionElement(questionCounter);
        quiz.append(nextQuestion).fadeIn();
        if (!(isNaN(selections[questionCounter]))) {
          $('input[value=' + selections[questionCounter] + ']').prop('checked', true);
        }

        // Controls display of 'prev' button
        if (questionCounter === 1) {
          $('#prev').show();
        } else if (questionCounter === 0) {

          $('#prev').hide();
          $('#next').show();
        }
      } else {
        var scoreElem = displayScore();
        quiz.append(scoreElem).fadeIn();
        $('#next').hide();
        $('#prev').hide();
        $('#start').show();
      }
    });
  }

  // Computes score and returns a paragraph element to be displayed
  function displayScore() {
    var score = $('<p>', {
      id: 'question'
    });

    var numCorrect = 0;
    for (var i = 0; i < selections.length; i++) {
      if (selections[i] === questions[i].correctAnswer) {
        numCorrect++;
      }
    }

    score.append('You got ' + numCorrect + ' questions out of ' +
      questions.length + ' right!!!');
    return score;
  }
})();

https://dev.botframework.com/

请纠正我的错误代码。请帮我解决这个问题。

// XY.hpp
namespace xxx
{

template<typename T> class XY;

template<typename T>
std::ostream& operator<<(std::ostream&, const XY<T>&);

template<typename T>
class XY
{
public:
    // ... constructors, destructor, getters, setters, etc
    friend      std::ostream& operator<< <T>(std::ostream&, const XY<T>&);

private:
    //...

};

} /* namespace xxx*/

Answer 1

https://jsfiddle.net/Lnnqqsmj/1/

您需要将此代码放在$(document).ready();

中

您正在使用一个自动执行的匿名函数，该函数在调用时运行，但您引用的元素尚未加载到DOM中，因此JS不了解它们。等到文档完全加载后再尝试访问DOM元素。

Answer 2

你的代码工作正常。这是jsfiddle。看来你在头文件标签里写了js代码。除非您添加会导致问题的document.ready。

如果您在结束document .ready标记附近添加脚本，您仍然可以不使用body

<body>
  // HTML code
<script>
 // js code
</script>
</body>

我正在使用html，javascript为Quiz编写代码。但它没有用

2 个答案: