JS generate random numbers

const getNum = (andNum, Num) => {
    //andNum Sum of random numbers ,Num Number of random numbers 
    var randomNum = new Array()
    let sum = 0
    for (var i=0;i<Num-1;i++)
    {
        x = Math.floor(Math.random() * (andNum - sum))
        randomNum[i] = x
        sum += x
    }
    randomNum[Num-1] = andNum - sum
    return randomNum
}

getNum(50,6)