1//get random value from array
2var colors = ["red","blue","green","yellow"];
3var randColor = colors[Math.floor(Math.random() * colors.length)];
4

1function getRandom(arr, n) {
2    var result = new Array(n),
3        len = arr.length,
4        taken = new Array(len);
5    if (n > len)
6        throw new RangeError("getRandom: more elements taken than available");
7    while (n--) {
8        var x = Math.floor(Math.random() * len);
9        result[n] = arr[x in taken ? taken[x] : x];
10        taken[x] = --len in taken ? taken[len] : len;
11    }
12    return result;
13}