快线:=(CLOSE-LLV(LOW,9))/(HHV(HIGH,9)-LLV(LOW,9))*100; 慢线:=SMA(快线,3,1); BB:=IF(BArslAst(crOSS(慢线,快线))>=3 AND CROSS(快线,慢线) AND 慢线<30,20,0); B买:BB>0;