如何通过
ruby | ror检查字符集是否采用utf-8编码？
解决方法
在
Ruby和其他任何地方都没有明确的方法可以做到这一点：
str = 'foo' # start with a simple string
# => "foo"
str.encoding
# => #<Encoding:UTF-8> # which is UTF-8 encoded
str.bytes.to_a
# => [102,111,111] # as you can see,it consists of three bytes 102,111 and 111
str.encode!('us-ascii') # now we will recode the string to 8-bit us-ascii encoding
# => "foo"
str.encoding
# => #<Encoding:US-ASCII>
str.bytes.to_a
# => [102,111] # see,same three bytes
str.encode!('windows-1251') # let us try some cyrillic
# => "foo"
str.encoding
# => #<Encoding:Windows-1251>
str.bytes.to_a
# => [102,the same three again!