设置变量的值

if (bjPrice > nbPrice) {
                alert("报价不能大于内部结算价");
                //我想在这个if里面设置bjPrice = 0 该怎么写
            } 

declare @bjPrice int;
declare @nbPrice int;
set @bjPrice = 100;
set @nbPrice = 10;
if (@bjPrice>@nbPrice)
begin
   set @bjPrice = 0 ;
end

if (bjPrice > nbPrice) {
                alert("报价不能大于内部结算价");
                //我想在这个if里面设置bjPrice = 0 该怎么写
                  currentRow.bj_price.value = '';
            }