製作答案不區分大小寫

Question

我在問用戶一個問題，我希望他們的答案不區分大小寫。無論他們是否使用大寫字母，他們都應該有正確的答案。任何幫助，這將不勝感激。

var name = prompt('Enter your name'); 
var correctAnswers = 0; 
var questions = 15; 

document.write('Okay '+name+' here is Question 1: What does html stand for?: HyperText Markup Language, High Track Making Language, High Tech Making Language'); 
var answer = prompt('Okay '+name+' here is Question 1: What does html stand for?: HyperText Markup Language, High Track Making Language, High Tech Making Language'); 

if (answer === 'HyperText Markup Language') { 
    console.log(correctAnswers = correctAnswers + 1); 
    console.log('That is correct!'); 
    document.write('<div>That is correct!</div>'); 
} else { 
    console.log('Sorry that is wrong. The correct answer is HyperText Markup Language.'); 
    document.write('<div>Sorry that is wrong. The correct answer is HyperText Markup Language.</div>'); 
} 

Answer 1

可以使用toLowerCase();或toUpperCase();

if (answer.toLowerCase() === ('HyperText Markup Language').toLowerCase()) { 
    console.log(correctAnswers = correctAnswers + 1); 
    console.log('That is correct!'); 
    document.write('<div>That is correct!</div>'); 
} else { 
    console.log('Sorry that is wrong. The correct answer is HyperText Markup Language.'); 
    document.write('<div>Sorry that is wrong. The correct answer is HyperText Markup Language.</div>'); 
} 

Answer 2

將字符串轉換爲全部小寫，使用的答案轉換爲小寫或大寫：

if (answer.toLowerCase() === "string") { 
    // code here 
}