字符，字符集，字符编码，果真是没开发过大型项目啊，没遇到过这方面的问题
常用字符集(Character Sets): ASCII, GB2312, Big5, Unicode
Unicode字符编码(Character Encodings): UTF-8, UTF-16, UTF-32, UCS-2, UCS-4
UTF-8遍地开花 一份介绍一份宣言，让大家一起来用UTF-8
every programmer should know about unicode and character sets 这都是2003年的文章历史真够悠久的
阮一峰ascii unicode utf8