js 数字变字母

function numberToLetter(num) {
    // 假设我们要将数字1-26转换为字母A-Z
    if (num >= 1 && num <= 26) {
        return String.fromCharCode(64 + num); // 65是'A'的ASCII码
    } else {
        return 'Invalid input';
    }
}

console.log(numberToLetter(1)); // 输出: A
console.log(numberToLetter(26)); // 输出: Z

function numberToLetter(num) {
    if (num >= 0 && num <= 25) {
        return String.fromCharCode(97 + num); // 97是'a'的ASCII码
    } else {
        return 'Invalid input';
    }
}

console.log(numberToLetter(0)); // 输出: a
console.log(numberToLetter(25)); // 输出: z

function numberToLetters(num) {
    let str = num.toString();
    let letters = '';
    for (let i = 0; i < str.length; i++) {
        let digit = parseInt(str[i]);
        if (digit >= 1 && digit <= 26) {
            letters += String.fromCharCode(64 + digit);
        } else {
            return 'Invalid input';
        }
    }
    return letters;
}

console.log(numberToLetters(123)); // 输出: ABC