指标如下，是咋回事？
db:=callstock('ay05',vtclose,3);
ac:=callstock('m05',vtclose,3);
cj:db-ac,colorwhite;
stickline(barslast(date<>ref(date,1))=0,ref(cj,1)*0.995,ref(cj,1)*1.005,0,coloryellow);
zzz:if(islastbar,cj+(cj*0.01),drawnull),colorcyan;
fff:if(islastbar,cj-(cj*0.01),drawnull),colorcyan;
drawsl(1,zzz,0,0,2,colorcyan);
drawsl(1,fff,0,0,2,colorcyan);
drawsl(islastbar,cj,0,0,2,colormagenta,1,vtdot);
ddb:=callstock('ay05',vtclose,7);
adc:=callstock('m05',vtclose,7);
ccj:ddb-adc,colormagenta;
stickline(barslast(month<>ref(month,1))=0,ref(ccj,1)*0.995,ref(ccj,1)*1.005,0,coloryellow);