显然我的 html 前面有空字段，当播放的轮数少于最大数量时，它用空白字符串填充其余部分.

Apparently I had empty fields on my html front, and when less than max amount of rounds where played it filled the rest with blank string.

空字符串不能输入到字符串列表中.

Blank string cannot be inputted to a string list.