1-n的阶乘js

function factorial(n) {
    if (n === 0 || n === 1) {
        return 1;
    }
    let result = 1;
    for (let i = 2; i <= n; i++) {
        result *= i;
    }
    return result;
}

// 使用函数计算5的阶乘
console.log(factorial(5)); // 输出: 120

function factorialsUpToN(n) {
    let factorials = [];
    for (let i = 1; i <= n; i++) {
        factorials.push(factorial(i));
    }
    return factorials;
}

// 计算从1到5的所有数的阶乘
console.log(factorialsUpToN(5)); // 输出: [1, 2, 6, 24, 120]

function bigFactorial(n) {
    if (n === 0 || n === 1) {
        return BigInt(1);
    }
    let result = BigInt(1);
    for (let i = 2; i <= n; i++) {
        result *= BigInt(i);
    }
    return result;
}

// 使用BigInt计算5的阶乘
console.log(bigFactorial(5).toString()); // 输出: "120"