注释是Ruby代码中的注释行，在运行时被忽略.单行注释以＃字符开头，它们从＃延伸到行尾，如下所示;
#!/usr/bin/ruby -w # This is a single line comment. puts "Hello, Ruby!"
执行时，上述程序产生以下结果 :
Hello, Ruby!
您可以使用 = begin 和=end
#!/usr/bin/ruby -w puts "Hello, Ruby!" =begin This is a multiline comment and con spwan as many lines as you like. But =begin and =end should come in the first line only. =end
执行时，上述程序产生以下结果 :
Hello, Ruby!
确保尾随的评论远离代码，并且可以轻松区分.如果块中存在多个尾随注释，请对齐它们.例如 :
@counter # keeps track times page has been hit @siteCounter # keeps track of times all pages have been hit
