為啥每個品種取到的s30不同

請教：

if selfdata(1)=0 then
BEGIN
x1:STKINDI(STKLABEL,'數(shù)據(jù)庫0012WHFY.SPB',0,3,-1),LINETHICK0;
END
if selfdata(1)=1 then BEGIN
 x2:STKINDI(STKLABEL,'數(shù)據(jù)庫0012WHFY.SPB',0,3,-1),LINETHICK0;
 END
if selfdata(1)=2 then BEGIN
x3:STKINDI(STKLABEL,'數(shù)據(jù)庫0012WHFY.SPB',0,3,-1),LINETHICK0;
END
if selfdata(1)=3 then BEGIN
x4:STKINDI(STKLABEL,'數(shù)據(jù)庫0012WHFY.SPB',0,3,-1),LINETHICK0;
END
if selfdata(1)=4 then BEGIN
x5:STKINDI(STKLABEL,'數(shù)據(jù)庫0012WHFY.SPB',0,3,-1),LINETHICK0;
END
if selfdata(1)=5 then BEGIN
x6:STKINDI(STKLABEL,'數(shù)據(jù)庫0012WHFY.SPB',0,3,-1),LINETHICK0;
END

s30:X1+X2+X3+X4+X5+X6,LINETHICK0;