MACD多头KD金叉的预警公式

老师给编个 kd取值（8 3 3）发生金叉二天内
macd取值(8 17 9)DIFF与DEA 也发生 金叉，但要在0轴线上的金叉的 组合预警选股公式。

对公式编写一窍不通啊

 

DIFF :=EMA(CLOSE,8) - EMA(CLOSE,17),;
DEA :=EMA(DIFF,9);
MACD :=2*(DIFF-DEA);
RSV:=(CLOSE-LLV(LOW,8))/(HHV(HIGH,8)-LLV(LOW,8))*100;
K:=SMA(RSV,3,1);
D:=SMA(K,3,1);
J:=3*K-2*D;
TT:=BARSLAST(crOSS(K,D));
XG:IF(TT<=2,SUM(CROSS(DIFF,DEA) AND DIFF>0 AND DEA>0,TT)=1,0);