If the caret character appears in any other position within the list , it matches itself 如果插入字符出现在列表中的其他任何位置,则它匹配其本身。
The user is trying to input extraneous characters beyond the end of the mask either because the mask has already been filled or the current caret position has been moved to the very end of the displayed input mask string 用户试图在掩码末尾的后面输入无关字符,这可能因为掩码已填充完毕,或者当前插入字符的位置已移至显示的输入掩码字符串的最末端。