什么是KDJ，KDJ有什么优点？

WA2:=SUM((IF(((WA1/8>20) AND (CLOSE>(REF(CLOSE,1)))),WA1,0)),0);
WA3:=SUM((IF(((WA1/8>20) AND (CLOSE<(REF(CLOSE,1)))),WA1,0)),0);
WA4:=SUM((IF(((WA1/8<20) AND (CLOSE>(REF(CLOSE,1)))),WA1,0)),0);
WA5:=SUM((IF(((WA1/8<20) AND (CLOSE<(REF(CLOSE,1)))),WA1,0)),0);
机构买盘:=(WA2);
机构卖盘:=(WA3);
散户买盘:=(WA4);
散户卖盘:=(WA5);
BU:=BARSLAST(CLOSE=HHV(CLOSE,60));
SE:=BARSLAST(CLOSE=LLV(CLOSE,60));
KK1:=SE;
KK2:=BU;
LM1:=SE;
LM2:=BU;
OK:=KK1>KK2 AND LM1>LM2;
OK1:=KK1>KK2 AND LM1<LM2;
NOK:=KK2>KK1 AND LM2>LM1;
NOK1:=KK2>KK1 AND LM2<LM1;
DRAWICON(FILTER(CROSS(KK1,KK2),60),OPEN*1,5);
DRAWTEXT(FILTER(CROSS(KK1,KK2),60) ,OPEN*0.985,'抓'),COLORFF0000;
TT1:=BARSCOUNT(C);
均价黄:=SUM(C*V,TT1)/SUM(V,TT1);
量两步:=MA(V,5)>REF(MA(V,5),1) AND REF(MA(V,5),1)>REF(MA(V,5),2);
价两步:= C>=REF(C,1) AND REF(C,1)>REF(C,2);
价上岗量破5:=C>均价黄 AND V>MA(V,5);
量起爆:=V>=REF(V,1)*1;
价创新高:=C>=HHV(C,0);
量创新高:=V>=HHV(V,0);
对昨日涨幅:=(C/DYNAINFO(3)-1)*100<=2.50;{涨幅控制2个点以内}