<script src="js/b/js/jquery.validate.js"></script>

<style type="text/css">
input.error{
  border-color: #a94442 !important;
  box-shadow: inset 0 1px 1px rgba(0,0,0,.075),0 0 8px #a94442 !important;
}

label.error{
  padding-left: 16px;
  padding-bottom: 2px;
  font-weight: bold;
  color: #EA5200;
}

<script type="text/javascript">
    $("#formDiscount").validate({
        rules : {
            title : "required"
        },
        messages : {
            title : "请输入标题"
        }
    });
</script>