s = '测试' # => "\346\270\254\350\251\246" s.encoding # => <Encoding:ASCII-8BIT> s.force_encoding 'utf-8' # => "测试" s[0] # => "测" s[1] # => "试" s[-1] # => "试" s.size # => 2 s.length # => 2 ('%5s' % s).force_encoding 'utf-8' # => " 测试" ('%-3s' % s).force_encoding 'utf-8' # => "测试 " 所以大概是预设 ascii-8bit, 有 utf-8 string 需求才手动强制转为 utf-8 string 吧， 想必是效能考量... refer the benchmark: http://groups.google.com/group/comp.lang.ruby/msg/4373ec7ef2403c65 -- Hear me exalted spirits. Hear me, be you gods or devils, ye who hold dominion here: I am a wizard without a home. I am a wonderer seeking refuge. Sacrifice --

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