Question

请帮我修改我的代码。在我的测验中，我有2个按钮，其中包含easyQuiz或hardQuiz功能，其中一个可以让您进行简单的测验，其中一个可以帮助您轻松完成。它有什么价值的难度，它应该使用那一系列的答案。我遇到的问题是我不认为正在加载答案数组，因为我收到一条错误，说'答案'没有定义。

// Insert number of questions
var numQues = 4;

// Insert number of choices in each question
var numChoi = 3;

// To set quiz difficulty
var difficulty = 0;

function easyQuiz (difficulty){
difficulty = 1;

// Insert number of questions displayed in answer area
var answers = new Array(4);

// Insert answers to questions
answers[0] = ["Apple"] ;
answers[1] = ["Dynamic HTML"];
answers[2] = ["Netscape"];
answers[3] = ["Common Gateway Interface"];
}

function hardQuiz (difficulty) {
difficulty = 2;

// Insert number of questions displayed in answer area
 var answers = new Array(4);

// Insert answers to questions
answers[0] = ["Test"] ;
answers[1] = ["Test"];
answers[2] = ["Test"];
answers[3] = ["Test"];
}





// Do not change anything below here ...
function getScore(form) {
var score = 0;
 var currElt;
 var currSelection;
for (i=0; i<numQues; i++) {
  currElt = i*numChoi;
  for (j=0; j<numChoi; j++) {
    currSelection = form.elements[currElt + j];
    if (currSelection.checked) {
      if (currSelection.value == answers[i]) {
        score++;
      break;
       }
     }
   }
 }
score = Math.round(score/numQues*100);
form.percentage.value = score + "%";
var correctAnswers = "";
 for (i=1; i<=numQues; i++) {
  correctAnswers += i + ". " + answers[i-1] + "\r\n";
}
 form.solutions.value = correctAnswers;
}
//  End -->

Answer 1

您在函数内部声明了答案变量。

如果要访问答案数组，则必须在较高范围内声明它。

var answers = [];
function easyQuiz (){
    difficulty = 1;
    answers = ["Apple", "Dynamic HTML", "Netscape", "Common Gateway Interface"];
}

Answer 2

你在函数中声明answer变量，这意味着它们是函数的本地变量，并且一旦函数结束就不再存在。

在函数外部声明变量以使其成为全局变量。

此外，您将数组作为项目放在数组中，根据代码的其余部分判断，您应该将字符串放在数组中。

var answers;

function easyQuiz (difficulty){
  difficulty = 1;

  // Insert number of questions displayed in answer area
  answers = new Array(4);

  // Insert answers to questions
  answers[0] = "Apple";
  answers[1] = "Dynamic HTML";
  answers[2] = "Netscape";
  answers[3] = "Common Gateway Interface";
}

function hardQuiz (difficulty) {
  difficulty = 2;

  // Insert number of questions displayed in answer area
  answers = new Array(4);

  // Insert answers to questions
  answers[0] = "Test";
  answers[1] = "Test";
  answers[2] = "Test";
  answers[3] = "Test";
}

创建函数数组

2 个答案: