我是Java语言的初学者
我想创建一个带有单选按钮的基本javascript测验应用程序。
测验结束时,我想发出一条警告消息,告知最终成绩。
我无法显示最终分数。
这是我编码的。
HTML:



   var allQuestions = [{
    question: "Who is the Prime Minister of the United Kingdom?",
    choices: ["David Cameron", "Gordon Brown", "Winston Churchill", "Tony Blair"],
    correctAnswer: 0
  },

  {
    question: "Who is the Prime Minister of India?",
    choices: ["Rahul Gandhi", "Arvind Kejrival", "Narendra Damodardas Modi"],
    correctAnswer: 2
  },

  {
    question: "Who is the Prime Minister of America?",
    choices: ["Donald Trump", "Barack Obama", "Hilary Clinton"],
    correctAnswer: 2
  }
];

var correctAnswers = 0;
$(document).ready(function() {
  var currentquestion = 0;

  $('#question').html(allQuestions[currentquestion].question);
  $('label[for=option0]').html(allQuestions[currentquestion].choices[0] + "<br/>");
  $('label[for=option1]').html(allQuestions[currentquestion].choices[1] + "<br/>");
  $('label[for=option2]').html(allQuestions[currentquestion].choices[2] + "<br/>");

  $("#next").click(function() {
    if ($("input[name=option]:checked").val() == allQuestions[currentquestion].correctAnswer) {
      correctAnswers++;
    };
    currentquestion++;
    if (currentquestion < allQuestions.length) {
      $('#question').html(allQuestions[currentquestion].question);
      $('label[for=option0]').html(allQuestions[currentquestion].choices[0] + "<br/>");
      $('label[for=option1]').html(allQuestions[currentquestion].choices[1] + "<br/>");
      $('label[for=option2]').html(allQuestions[currentquestion].choices[2] + "<br/>");
      if (currentquestion == allQuestions.length - 1) {
        $('#next').html("Submit");
        $('#next').click(function() {
         /*If I comment out the following if statement, but retain correctAnswers++, I do get alert message,but the result is obviously wrong*/
          if ($("input[name=option]:checked").val() == allQuestions[currentquestion].correctAnswer) {
            correctAnswers++;
          }
          alert(correctAnswers);
          //alert("Your Score is " + correctAnswers + " out of " + currentquestion + " and your percentage is " + (correctAnswers*100/currentquestion) + "%");
        });

      }

    };
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<body>
  <div>
    <h3 id="question"></h3>
    <form id="form">
      <input type="radio" name="option" value="0" id="option0" checked>
      <label for='option0'>
        <br/>
      </label>
      <input type="radio" name="option" value="1" id="option1">
      <label for='option1'>
        <br/>
      </label>
      <input type="radio" name="option" value="2" id="option2">
      <label for='option2'>
        <br/>
      </label>
    </form>
  </div>
  <br/>
  <a href="#" id="next" class="button hvr-bounce-to-right">Next</a>

</body>





请帮忙!
这是JSFiddle

最佳答案

如果您注释if和correctAnswers ++句子,则您的代码正确运行。

         /*If I comment out the following if statement, but retain correctAnswers++, I do get alert message,but the result is obviously wrong*/
          /*if ($("input[name=option]:checked").val() == allQuestions[currentquestion].correctAnswer) {
            correctAnswers++;
          }*/
          alert(correctAnswers);
          alert("Your Score is " + correctAnswers + " out of " + currentquestion + " and your percentage is " + (correctAnswers*100/currentquestion) + "%");

08-15 14:52
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