The character class name for printable characters.
表示可打印字符的字符分类名称。
2
Listing 9 USES Quoted-Printable encoding that corresponds to printable characters according to the ASCII character set.
清单9使用Quoted - Printable编码，这种编码符合依照ASCII字符集的可打印字符。
3
Following is a list of printable characters from the US-ASCII coded character set, specifically the octets ranging from 32 to 126 (decimal), that the functions will percent-encode.