JS移除数组中重复数据

<script>
var arrs = ["11","22","33","44","55","666"];
function unq(arrs ) {
  var result = [], hash = {};
  for (var i = 0, elem; (elem = arr[i]) != null; i++) {
    if (!hash[elem]) {
      result.push(elem);
      hash[elem] = true;
    }
  }
  return result;
}
console.info(unq(arrs ));
</script>