URL：/cgi-bin/test.cgi?FirstName=Zara&LastName=Ali

获取参数

#!/usr/bin/ruby
require 'cgi'
cgi = CGI.new
cgi['FirstName'] # =>  ["Zara"]
cgi['LastName']  # =>  ["Ali"]

另一种写法

#!/usr/bin/ruby
require 'cgi'
cgi = CGI.new
h = cgi.params  # =>  {"FirstName"=>["Zara"],"LastName"=>["Ali"]}
h['FirstName']  # =>  ["Zara"]
h['LastName']   # =>  ["Ali"]

获取全部参数

#!/usr/bin/ruby
require 'cgi'
cgi = CGI.new
cgi.keys         # =>  ["FirstName", "LastName"]