UTF-8，UTF-16和UTF-32 [英] UTF-8, UTF-16, and UTF-32

问题描述

UTF-8，UTF-16和UTF-32有什么区别?

What are the differences between UTF-8, UTF-16, and UTF-32?

我知道它们都将存储Unicode，并且每个都使用不同数量的字节来表示字符.选择一个而不是另一个有优势吗?

I understand that they will all store Unicode, and that each uses a different number of bytes to represent a character. Is there an advantage to choosing one over the other?

推荐答案

在ASCII字符代表文本块中大多数字符的情况下，UTF-8具有优势，因为UTF-8将这些字符编码为8位(像ASCII).另一个优点是，仅包含ASCII字符的UTF-8文件具有与ASCII文件相同的编码.

UTF-8 has an advantage in the case where ASCII characters represent the majority of characters in a block of text, because UTF-8 encodes these into 8 bits (like ASCII). It is also advantageous in that a UTF-8 file containing only ASCII characters has the same encoding as an ASCII file.

UTF-16在ASCII不占优势的情况下更好，因为它主要每个字符使用2个字节.对于高阶字符，UTF-8将开始使用3个或更多字节，而对于大多数字符，UTF-16将仅保留2个字节.

UTF-16 is better where ASCII is not predominant, since it uses 2 bytes per character, primarily. UTF-8 will start to use 3 or more bytes for the higher order characters where UTF-16 remains at just 2 bytes for most characters.

UTF-32将以4个字节覆盖所有可能的字符.这使它显得肿.我想不出使用它的任何优势.

UTF-32 will cover all possible characters in 4 bytes. This makes it pretty bloated. I can't think of any advantage to using it.

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