Two problems:
1. The extended ASCII single-byte character set, belong to ANSI code?
2. the definition of ANSI code? baidu encyclopedia has said "the use of multiple bytes to represent an extended character encoding of the characters" (https://baike.baidu.com/item/ANSI/10401940#viewPageContent), but in the terms "standard coding format" (https://baike.baidu.com/item/%E6%A0%87%E5%87%86%E7%BC%96%E7%A0%81%E6%A0%BC%E5%BC%8F/20868617? Fr=Aladdin), ANSI code have mentioned ISO - 8859-2, this standard seems to be only one byte, and here also mentions in the box in the ASNI "a UNICODE characters may be converted into a byte or more", so, the ANSI code contains 1 byte code? And what is the difference between a single-byte character set?