Question

是否可以运行并输出所有方法？不确定如何通过点运算符传递符号。因此，link.:node应该是link.node

而不是

require 'mechanize'

agent = Mechanize.new
page = agent.get("http://stackoverflow.com/")


link = page.link
p meth = link.methods #=> [:node, :href, :attributes, :page, :referer, :click, :dom_id, :dom_class, :pretty_print, :inspect, :rel, :rel?, :noreferrer?, :text, :to_s, :uri, :pretty_print_cycle, :pretty_print_instance_variables, :pretty_print_inspect, :nil?, :===, :=~, :!~, :eql?, :hash, :<=>, :class, :singleton_class, :clone, :dup, :initialize_dup, :initialize_clone, :taint, :tainted?, :untaint, :untrust, :untrusted?, :trust, :freeze, :frozen?, :methods, :singleton_methods, :protected_methods, :private_methods, :public_methods, :instance_variables, :instance_variable_get, :instance_variable_set, :instance_variable_defined?, :instance_of?, :kind_of?, :is_a?, :tap, :send, :public_send, :respond_to?, :respond_to_missing?, :extend, :display, :method, :public_method, :define_singleton_method, :object_id, :to_enum, :enum_for, :pretty_inspect, :==, :equal?, :!, :!=, :instance_eval, :instance_exec, :__send__, :__id__]


   #this doesn't work.
    meth.each do |x|
      puts "#{x}: #{link.x}"
    end

{{1}}

Answer 1

如果要访问该类的方法，可以使用以下方法

调用私有方法

meth.each { |x| puts "#{x}: #{link.class.send(x)}" }

调用公共方法

meth.each { |x| puts "#{x}: #{link.send(x)}" }

使用参数或参数调用方法

meth.each { |x| puts "#{x}: #{link.class.send(x, params_or_arguments)}" }
meth.each { |x| puts "#{x}: #{link.send(x, params_or_arguments)}" }

Answer 2

您可以使用send，但正如评论中指出的那样，很多方法都会出错：

meth.each { |x| puts "#{x}: #{link.send(x)}" }

顺便说一句：如果你正在努力学习Ruby，我写了一篇可能对你感兴趣的宝石：methodfinder

Ruby，运行所有方法

2 个答案: