With masked fields you can specify a literal mask. A literal mask contains the initial values of a form, and is always visible after downloading a form. Using a character code for the Edit mask, you can determine the entries that the user can type into the masked field.
使用掩码字段，可以指定字符掩码。字符掩码含有表单的初始值，并在表单下载后始终可见。使用编辑掩码的字符码，可以确定用户在掩码字段中能够键入的条目。