怎么样:

# Using pack
puts ["2B71F".hex].pack("U")

# Using chr
puts (0x2B71F).chr(Encoding::UTF_8)

在 Ruby 1.9+ 中你也可以这样做:

In Ruby 1.9+ you can also do:

puts "u{2B71F}"

即u{} 转义序列可用于解码 Unicode 代码点.

I.e. the u{} escape sequence can be used to decode Unicode codepoints.