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      2. <pre id="mfppm"></pre>
        

          

          


          



          

          

          

          


          

          

          

          Ruby 官方文檔 
          

          

          

          

          

          Resource
          

          

          Online
          


          

          

          Download
          


          

          

          Related
          


          

          

          

          Array
          

          

          Array
          


          

          

          

          File
          

          

          File
          


          

          

          

          String
          

          

          String
          


          

          

          

          Math
          

          

          Math
          


          

          

          

          Integer
          

          

          Integer
          


          

          

          

          Numeric
          

          

          Numeric
          


          

          

          

          Object
          

          

          Object
          


          

          

          

          Hash
          

          

          Hash
          


          

          

          

          Regexp
          

          

          Regexp
          


          

          

          

          IO
          

          

          Methods
          


          

          

          Namespace
          


          

          

          

          Time
          

          

          Time
          


          

          

          

          ARGF
          

          

          ARGF
          


          

          

          

          BasicObject
          

          

          BasicObject
          


          

          

          

          Bignum
          

          

          Bignum
          


          

          

          

          Class
          

          

          Class
          


          

          

          

          Complex
          

          

          Complex
          


          

          

          

          Encoding
          

          

          Methods
          


          

          

          Namespace
          


          

          

          

          Enumerator
          

          

          Methods
          


          

          

          Namespace
          


          

          

          

          Exception
          

          

          Exception
          


          

          

          

          Fiber
          

          

          Fiber
          


          

          

          

          Float
          

          

          Float
          


          

          

          

          Fixnum
          

          

          Fixnum
          

            

          

          

          

          

          Kernel
          

          

          Kernel
          


          

          

          

          Method
          

          

          Method
          


          

          

          

          Module
          

          

          Module
          


          

          

          

          Proc
          

          

          Proc
          


          

          

          

          Process
          

          

          Methods
          


          

          

          Namespace
          


          

          

          

          Random
          

          

          Random
          


          

          

          

          Range
          

          

          Range
          


          

          

          

          Rational
          

          

          Rational
          

            

          

          

          

          

          Symbol
          

          

          Symbol
          


          

          

          

          Thread
          

          

          Thread
          


          

          

          

          Pre-defined
          

          

          Variables
          

            

          • $`

            • 

          • The string to the left  of the last successful match.
            • 

          • $_

            • 

          • The last input line of string by gets or readline.
            • 

          • $-0

            • 

          • The alias to $/
            • 

          • $-a

            • 

          • True if option -a is set. Read-only variable.
            • 

          • $-d

            • 

          • The alias to $DEBUG.
            • 

          • $-F

            • 

          • The alias to $;.
            • 

          • $-i

            • 

          • In in-place-edit mode, this variable holds the extention, otherwise nil.
            • 

          • $-l

            • 

          • True if option -l is set. Read-only variable.
            • 

          • $-p

            • 

          • True if option -p is set. Read-only variable.
            • 

          • $-v

            • 

          • The alias to $VERBOSE.
            • 

          • $,

            • 

          • The output field separator for the print and Array#join.
            • 

          • $;

            • 

          • The default separator for String#split.
            • 

          • $:

            • 

          • Load path for scripts and binary modules by load or require.
            • 

          • $!

            • 

          • The exception information message set by ‘raise’.
            • 

          • $?

            • 

          • The status of the last executed child process.
            • 

          • $.

            • 

          • The current input line number of the last file that was read.
            • 

          • $'

            • 

          • The string to the right of the last successful match.
            • 

          • $"

            • 

          • The array contains the module names loaded by require.
            • 

          • $@

            • 

          • Array of backtrace of the last exception thrown.
            • 

          • $*

            • 

          • Command line arguments given for the script sans args.
            • 

          • $/

            • 

          • The input record separator, newline by default.
            • 

          • $\

            • 

          • The output record separator for the print and IO#write. Default is nil.
            • 

          • $&

            • 

          • The string matched by the last successful pattern match in this scope.
            • 

          • $>

            • 

          • The default output for print, printf. $stdout by default.
            • 

          • $<

            • 

          • The virtual concatenation file of the files given on command line.
            • 

          • $+

            • 

          • The last bracket matched by the last successful match.
            • 

          • $=

            • 

          • The flag for case insensitive, nil by default.
            • 

          • $~

            • 

          • The information about the last match in the current scope.
            • 

          • $$

            • 

          • The process number of the Ruby running this script.
            • 

          • $0

            • 

          • Contains the name of the script being executed. May be assignable.
            • 

          • $1

            • 

          • The Nth group of the last successful match. May be > 1.
            • 

          • $DEBUG

            • 

          • The status of the -d switch.
            • 

          • $FILENAME

            • 

          • Current input file from $<. Same as $<.filename.
            • 

          • $LOAD_PATH

            • 

          • The alias to the $:.
            • 

          • $stderr

            • 

          • The current standard error output.
            • 

          • $stdin

            • 

          • The current standard input.
            • 

          • $stdout

            • 

          • The current standard output.
            • 

          • $VERBOSE

            • 

          • The verbose flag, which is set by the -v switch.
            • 

          

          

          

          Global Constant
          

            

          • ARGV

            • 

          • The alias to the $*.
            • 

          • DATA

            • 

          • The file object of the script, pointing just after __END__.
            • 

          • ENV

            • 

          • The hash contains current environment variables.
            • 

          • FALSE

            • 

          • The false itself.
            • 

          • NIL

            • 

          • The nil itself.
            • 

          • RUBY_PLATFORM

            • 

          • The platform identifier
            • 

          • RUBY_RELEASE_DATE

            • 

          • The relase date string.
            • 

          • RUBY_VERSION

            • 

          • The ruby version string (VERSION was depricated).
            • 

          • STDERR

            • 

          • The standard error output. The default value for $stderr.
            • 

          • STDIN

            • 

          • The standard input. The default value for $stdin.
            • 

          • STDOUT

            • 

          • The standard output. The default value for $stdout.
            • 

          • TRUE

            • 

          • The typical true value.
            • 

          

          

          

          

          

          

          

          




          

          

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              2. <pre id="mfppm"></pre>