控制select标签中的默认选项的样式

<script type="text/javascript">
    $(function () {
        var unSelected = "#C0C0C0";
        var selected = "#424242";
        $(function () {
            $("select").css("color", unSelected);
            $("option").css("color", selected);
            $("select").change(function () {
                var selItem = $(this).val();
                if (selItem == $(this).find('option:first').val()) {
                    $(this).css("color", unSelected);
                } else {
                    $(this).css("color", selected);
                }
            });
        })
    })
</script>