Javascript generate random unique number every time

Question

Ok so i need to create four randomly generated numbers between 1-10 and they cannot be the same. so my thought is to add each number to an array but how can I check to see i

Answer 1

Use an array to see if the number has already been generated.

var randomArr = [], trackingArr = [],
    targetCount = 4, currentCount = 0,
    min = 1, max = 10,
    rnd;

while (currentCount < targetCount) {
    rnd = Math.floor(Math.random() * (max - min + 1)) + min;
    if (!trackingArr[rnd]) {
        trackingArr[rnd] = rnd;
        randomArr[currentCount] = rnd;
        currentCount += 1;
    }
}

alert(randomArr); // Will contain four unique, random numbers between 1 and 10.

Working example: http://jsfiddle.net/FishBasketGordo/J4Ly7/