主题：请教为什么会有白色箭头

if jc>dayupper and holding<0 then sellshort(holding<0,0,limitr,c);
if jc<daylower and holding>0 then sell(holding>0,0,limitr,c);
if jc>dayupper and holding=0 then buy(holding=0,ss,limitr,c);
if jc<daylower and holding=0 then buyshort(holding=0,ss,limitr,c);