DIFF:=EMA(CLOSE,12) - EMA(CLOSE,26); DEA:=EMA(DIFF,8); A1:=BARSLAST(REF(CROSS(DIFF,DEA),1)); B1:=REF(C,A1+1)>C AND REF(DIFF,A1+1)<DIFF AND CROSS(DIFF,DEA); MACD底背:IF(B1>0,50,0) AND L-0.1;