js color game

<script>
        var acolors = ["crimson", "aqua", "lawngreen", "coral", "darkblue", "violet", "grey", "yellow", "blueviolet"];

        document.getElementById("output").style.backgroundColor="crimson";

        function color() {
            acolors = shuffle(acolors);

            for (var i=0; i<acolors.length; i++) {
                var id = "td"+(i+1);
                var kleur = acolors[i];
                document.getElementById(id).style.backgroundColor= kleur
            }
        document.getElementById("output").style.backgroundColor="crimson";
        }
        function shuffle(arr) {
            for (var j, x, i = arr.length; i; j = Math.floor(Math.random() *i ), x = arr[--i], arr[i] = arr[j], arr[j] = x);
            return arr;
        }
        function setTimer() {
            setInterval(color, 2000);
        }
    </script>