如果可编辑的字符未赋值，在其位置上将显示从掩码中复制的提示字符；如果它们已被赋予一个输入值，在其位置上将出现有效的输入字符。
The editable character positions will either be occupied by the prompt character copied from the mask if they are unassigned, or with a valid input character if they have been assigned an input.
如果可编辑的字符未赋值，在其位置上将显示从掩码中复制的提示字符；如果它们已被赋予一个输入值，在其位置上将出现有效的输入字符。
The editable character positions will either be occupied by the prompt character copied from the mask if they are unassigned, or with a valid input character if they have been assigned an input.
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