Ruby 日期方法问题
ruby-1.9.2-p290 :001 > require 'date' => true
ruby-1.9.2-p290 :002 > date = '01/23/2011'=> "01/23/2011"
ruby-1.9.2-p290 :003 > Date.strptime(date, "%m/%d/%Y") =>
#<Date: 2011-01-23 (4911169/2,0,2299161)>
ruby-1.9.2-p290 :004 > Date.mon
NoMethodError: undefined method `mon' for Date:Class
from (irb):4
from /Users/noahclark/.rvm/rubies/ruby-1.9.2-p290/bin/irb:16:in `<main>'
ruby-1.9.2-p290 :005 >
为什么要这样做？我查看了文档， .mon 或 .month 是有效的方法。
提前致谢。
ruby-1.9.2-p290 :001 > require 'date' => true
ruby-1.9.2-p290 :002 > date = '01/23/2011'=> "01/23/2011"
ruby-1.9.2-p290 :003 > Date.strptime(date, "%m/%d/%Y") =>
#<Date: 2011-01-23 (4911169/2,0,2299161)>
ruby-1.9.2-p290 :004 > Date.mon
NoMethodError: undefined method `mon' for Date:Class
from (irb):4
from /Users/noahclark/.rvm/rubies/ruby-1.9.2-p290/bin/irb:16:in `<main>'
ruby-1.9.2-p290 :005 >
Why does it do this? I've looked in the documentation and .mon or .month is a valid method.
Thanks in advance.
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mon和month是Date实例的有效方法。您在Date上调用它们 - 即类。monandmonthare valid methods ofDateinstances. You're calling them onDate- that is, a class.我建议您看一下类方法和实例方法之间的区别。
strptime属于前者，mon属于后者。I suggest you take a look at the difference between class and instance methods.
strptimebelongs to the former,monto the latter.