标题：老师，能不能帮我在下面公式中增加个止损单。

ma1:ma(c,5);

ma2:ma(c,10);

ma3:ma(c,20);

ma4:ma(c,60);

diff:=stkindi('','macd.diff',0,datatype);

dea:=stkindi('','macd.dea',0,datatype);

macd:=stkindi('','macd.macd1',0,datatype);

if cross(diff,dea) then begin

   sellshort(1,0,marketr);

   buy(holding=0,1,marketr);

end

if cross(dea,diff) then begin

   sell(1,0,marketr);

   buyshort(holding=0,1,marketr);

end

 

//固定止损

if (enterprice-c)/enterprice>=0.01 and holding>0 then sell(1,0,marketr);

if (c-enterprice)/enterprice>=0.01 and holding<0 then sellshort(1,0,marketr);

 

//回撤止损

if c<=hhv(h,enterbars+1)*0.99 and holding>0 then sell(1,0,marketr);

if c>=llv(l,enterbars+1)*1.01 and holding<0 then sellshort(1,0,marketr);

持仓:holding,linethick0;

资产:asset,noaxis;