老师帮忙加个固定止损

老师帮忙给这个双均线系统加个固定止损，就是当损失达到500元或者50跳就平仓。（500或50可调）。谢谢 Params Numeric FastLength(5); Numeric SlowLength(20); Vars NumericSeries AvgValue1; NumericSeries AvgValue2; Begin AvgValue1 = AverageFC(Close,FastLength); AvgValue2 = AverageFC(Close,SlowLength); PlotNumeric("MA1",AvgValue1); PlotNumeric("MA2",AvgValue2); // 集合竞价和小节休息过滤 If(!CallAuctionFilter()) Return; If(MarketPosition <>1 && AvgValue1[1] > AvgValue2[1]) { Buy(1,Open); } If(MarketPosition <>-1 && AvgValue1[1] < AvgValue2[1]) { SellShort(1,Open); } //PlotNumeric("PL",Portfolio_TotalProfit); End