多谢wxj120bw(印风)帮忙
我换成这个了
index=0;
int count = ui->TableInfor_1->rowCount();
if(index = 3 <= 0) {
index = 0;
}else if(index + 3 >= count) {
index = count - 3;
}else {
index = index + 3;
}
ui->TableInfor_1->scrollToItem(ui->TableInfor_1->item(index, 0), QAbstractItemView::PositionAtTop);