utf8、utf-8、UTF8、UTF-8那个是正确的?

The official registry of encodings defines the names as case-insensitive and the spelling as UTF-8 (UTF8 isn’t even a valid alias). It is highly unlikely that any software that can deal with UTF-8 would not recognize the name UTF-8. So in all places, it is important to use UTF-8 and not UTF8.

Since the names are case-insensitive, documentation may use any casing. Software that imposes case restrictions on them would be seriously broken, and I don’t see why would assume that such software exists. Variation in documentation does not mean that some specific casing of letters must be used.

总结:

1、不区分大小写

2、utf8与UTF8是错误的

3、utf-8与UTF-8是正确的


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