M:=30;
VA:=IF(CLOSE>REF(CLOSE,1),VOL,-VOL);
OBV:=SUM(IF(CLOSE=REF(CLOSE,1),0,VA),0);
MAOBV:=MA(OBV,M);
金叉:CROSS(OBV,MAOBV);
死叉:CROSS(MAOBV,OBV);