2. The character class name for digit characters. 表示数字字符的字符分类名称。
3. An operation resulting in the reverse significance in each digit position in a series of digits. 一种对一串数字中每一位数都求反变成其相反意义的数的运算。
英英解释
n.
1. one of the elements that collectively form a system of numeration
2. the length of breadth of a finger used as a linear measure
3. a finger or toe in human beings or corresponding body part in other vertebrates