1、BOLL:=MA(CLOSE,20);UB:=BOLL+2*STD(CLOSE,20);LB:=BOLL-2*STD(CLOSE,20);XG:CROSS(C,UB);2、BOLL:=MA(CLOSE,20);UB:=BOLL+2*STD(CLOSE,20);LB:=BOLL-2*STD(CLOSE,20);XG:CROSS(LB,C);