UTF8编码？ [英] UTF8 Encoding?

问题描述

什么是UTF-8编码，为什么以此格式保存的文本文件比其他文件更大？

What is UTF-8 encoding and why text files saved in this Format are more bigger than the other?

例如我在记事本中键入了A并以UTF-8格式保存。

For example I had typed 'A' in the notepad and save it in UTF-8 format.

之后，文件大小变为：4个字节。为什么？

After that, The file size turns to : 4 bytes . why?

推荐答案

几乎可以肯定，因为你使用保存文件还包括字节顺序标记，在UTF-8中为0xEF 0xBB 0xBF。

It's almost certainly because whatever you're using to save the file is also including the byte order mark which in UTF-8 is 0xEF 0xBB 0xBF.

-8是 - 这是一个Unicode编码，使用更高的Unicode值逐渐增加字节;重要的是，ASCII字符存储为单字节（与ASCII中的字节相同）。所以任何ASCII文件也是一个具有相同文本的UTF-8文件。 此网页有更多内容，维基百科。

As for what UTF-8 is - it's a Unicode encoding which uses progressively more bytes for higher Unicode values; importantly, ASCII characters are stored as single bytes (the same bytes as they would be in ASCII). So any ASCII file is also a UTF-8 file with the same text. This web page has more, as does Wikipedia.

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