Pattern fields consist of an edit mask and a literal mask. The edit mask determines which data can be entered. The literal mask determines the contents of the pattern field when loading the form.
掩码字段由编辑掩码和字符掩码组成。编辑掩码用于确定可以输入的数据，字符掩码用于确定加载窗体时掩码字段的内容。