产生不重复的随机数据

<script>
var a=["1","2","3","4","5"];
shuffleArray(a);
alert(shuffleArray(a));
function shuffleArray(array) {
for (var i = array.length - 1; i > 0; i--) {
var j = Math.floor(Math.random() * (i + 1));
var temp = array[i];
array[i] = array[j];
array[j] = temp;
}
return array;
}
</script>