rubyist.net网站实例学习
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字符串::

   ruby> "\n"
     "\n"    # 即换行
   ruby> '\n'
     "\\n"   # 不是换行
   ruby> "abcd #{5*3} efg"
     "abcd 15 efg"
   ruby> var = " abc "
     " abc "
   ruby> "1234#{var}5678"
     "1234 abc 5678"



   ruby> "foo" + "bar"
     "foobar"
   ruby> "foo" * 2
     "foofoo"

   puts "Hello #{name}!"     #字符串中设置变量