Question

代码没有给出正确和错误答案的不同分数，我需要它来给出问题的总分;即使你提出了错误的答案，它也说你还有3/3

<html>
        <head> 
        <title>
            00000
        </title>
    </head>
    <body>
        <script>
            //variables
            var q1 = parseInt(prompt("What data type is a number? " + " A:Boolean      
    B:     Integer  C: String"));
            var q2 = parseInt(prompt(" What operator means not equal to? " + " A:< 
            B: = =  C: !="));
        var q3 = parseInt(prompt(" Which function is used to square root?" + "A:
            math.sqrt  B: math.pi  C: math.pow"));
            var score1 = 0;
            var score2 = 0;
            var score3 = 0;


            //calculate score
            if (q1 = "B") 
                score1 = 1
                else if (q1 = "A" || "C")
                    score1 = 0

            if (q2 = "C") 
                score2 = 1
                else if (q1 = "A" || "B")
                    score2 = 0

            if (q3 = "A") 
                score3 = 1 
                else if (q1 = "B" || "C")
                    score3 = 0

            totalScore = score1 + score2 + score3;

            //output
            alert("Total score = " + totalScore + "/3");            

        </script>
      </body>
 </html>

Answer 1

你正在使用赋值算子而不是在你的描述中进行比较。

if (q1 === "B")
   score1 = 1
else
   score1 = 0

如果在使用=时可以将“B”分配给q1，则第一个eval将始终返回true 使用==或===来评估q1是否与“B”相同。

Answer 2

我认为您可以使用ternary大大简化代码。像，

＆＃13;

var q1 = "A";
var q2 = "B";
var q3 = "C";
var score1 = (q1 === "B") ? 1 : 0;
var score2 = (q2 === "C") ? 1 : 0;
var score3 = (q3 === "A") ? 1 : 0;
var totalScore = score1 + score2 + score3;
alert("Total score = " + totalScore + "/3");

＆＃13;

Answer 3

首先，如果您希望prompt上有字符串响应，则不应该在响应中运行parseInt()，因为您随时可以获得NaN输入非整数因此使您的进一步测试失效。

其次，如前所述，要进行比较，您应该使用==或===代替=。

最后，有很多方法可以大大简化此脚本，例如以下：

// Store the responses and answers in their own arrays
var responses = [
      prompt("What data type is a number? " + " A: Boolean B: Integer C: String "),
      prompt(" What operator means not equal to? " + " A: <  B: == C: != "),
      prompt(" Which function is used to square root?" + "A: math.sqrt B: math.pi C: math.pow ")
    ],
    answers = ['B','C','A'], // Store the correct answers in order
    score = 0; // Start off the score at zero.

// Match each response with it's respective answer
// and add +1 to the score if they match...
// Also, make sure the input is a string so toUpperCase() works (in case someone answers in lowercase)
for(x in responses) {   
  score = (typeof responses[x] == 'string' && responses[x].toUpperCase() == answers[x]) ? score+1 : score;
}

// Show score
alert('You scored ' + score + '/3');

javascript，测验得分不起作用

3 个答案: