参考：
DIFF:=EMA(CLOSE,9) - EMA(CLOSE,12);
DEA:=EMA(DIFF,6);
MACD:=2*(DIFF-DEA);
STICKLINE(MACD>0,0,MACD,COLORRED,0);
STICKLINE(MACD<0,0,MACD,COLORGREEN,0);
JC:=CROSS(DIFF,DEA);
SC:=CROSSDOWN(DIFF,DEA);
N1:=BARSLAST(JC)+1;
N2:=BARSLAST(SC)+1;
HH:=VALUEWHEN(CROSSDOWN(DIFF,DEA),HHV(H,N1));//上次MACD红柱期间合约最大值
HH2:=VALUEWHEN(CROSSDOWN(DIFF,DEA),REF(HH,1));//上上次MACD红柱期间合约最大值
MHD:=VALUEWHEN(CROSSDOWN(DIFF,DEA),HHV(MACD,N1));//上次MACD红柱期间MACD最大值
MHD2:=VALUEWHEN(CROSSDOWN(DIFF,DEA),REF(MHD,1));//上上次MACD红柱期间MACD最大值
LL:=VALUEWHEN(CROSS(DIFF,DEA),LLV(L,N2));//上次MACD绿柱期间合约最小值
LL2:=VALUEWHEN(CROSS(DIFF,DEA),REF(LL,1));//上上次MACD绿柱期间合约最小值
MLD:=VALUEWHEN(CROSS(DIFF,DEA),LLV(MACD,N2));//上次MACD绿柱期间MACD最小值
MLD2:=VALUEWHEN(CROSS(DIFF,DEA),REF(MLD,1));//上上次MACD绿柱期间MACD最小值
A:=CROSSDOWN(DIFF,DEA)&&HH>HH2&&MHD<MHD2;//顶背离
B:=CROSS(DIFF,DEA)&&LL<LL2&&MLD>MLD2;//底背离
DRAWTEXT(A,0,'↓'),FONTSIZE31,COLORGREEN;
DRAWTEXT(B,0,'↑'),FONTSIZE31,COLORRED,VALIGN0;
