jquery 數組添加不重復數據

var columnCommentsArray = new Array();
$("input[name='columnComments']").each( 
    function(){
        var columnComments = $(this).val();
        if("" == columnComments) {
            flag = false;
            message += "字段名不能為空！<br/>";
            return false;
        } else {
            if($.inArray(columnComments,columnCommentsArray) < 0){
                columnCommentsArray.push(columnComments);
            }
        }
    }
) 
if(columnCommentsArray.length != columnCommentsCount) {
    flag = false;
    message += "存在相同的字段名，請修改！";
}