ruby 中，将字节数组转换成特定编码的字符串
使用 pack & force_encoding。
1 2 3 4 5 6 | irb> [0xe9, 0xa1, 0xb9].pack("C*").force_encoding("utf-8") => "\u9879" irb> [0xe9, 0xa1, 0xb9].pack("C*").force_encoding("utf-8").encode("gbk") => "项" irb> "\xe9\xa1\xb9".force_encoding("utf-8") => "\u9879" |