pobo高低点指标，可以显示前期高点和低点 n=13
HD:=FILTER(BACKSET(FILTER(REF(H,N)=HHV(H,2*N+1),N),N+1),N); LD:=FILTER(BACKSET(FILTER(REF(L,N)=LLV(L,2*N+1),N),N+1),N); DRAWNUMBER(HD,HIGH,HIGH,0),COLORGREEN,ALIGN1,VALIGN2; DRAWNUMBER(LD,LOW,LOW,0),ALIGN1,VALIGN0;
