你可以取最小的指数值，用这个值减去两个指数，得到余数，然后乘以最小指数。

|
10000|000000000
    5|000000000
     |

const
    fn = (a, b, c, d) => {
        const min = Math.min(b, d);
        return a * 10 ** (b - min) % (c * 10 ** (d - min)) * 10 ** min;
    }
    
console.log(fn(1, 13, 5, 9));

最好编写一个函数来转换科学-〉BigInt
注意，BigInt和Integer不能互换使用。

const scientific = (coefficient, exponent) => {
    return BigInt(coefficient) * 10n**BigInt(exponent);
}

const first_value = [
 1, // x*10^y, this is x
 13 // x*10^y, this is y
] // this is 1*10^13
const second_value = [
 5, //x*10^y, this is x
 9 //x*10^y, this is y
] // this is 5*10^9

const modulo_value = scientific(...first_value) % scientific(...second_value)

console.log(scientific(...first_value)) // 10000000000000
console.log(scientific(...second_value)) // 5000000000
console.log(10000000000000 % 5000000000) // 0 (regular int)
console.log(modulo_value) // 0 (BigInt)