解析 nokogiri 元素时的问题

Question

我正在使用 Mechanize gem 来解析 html 内容。

在终端上触发，

 agent.get("http://www.example.com/").search(".sidebar-deal-excerpt").first

给我这个：

 <Nokogiri::XML::Element:0x3fcdb3add700 name="div" attributes=[#<Nokogiri::XML::Attr:0x3fcdb3add570 name="class" value="sidebar-deal-excerpt">] children=[#<Nokogiri::XML::Text:0x3fcdb3add0ac "\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t">, #<Nokogiri::XML::Element:0x3fcdb3adcfd0 name="a" attributes=[#<Nokogiri::XML::Attr:0x3fcdb3adcf6c name="href" value="http://www.example.com/getaway-8774-yatra-september-deal">] children=[#<Nokogiri::XML::Text:0x3fcdb3adcaa8 " ">, #<Nokogiri::XML::Element:0x3fcdb3adc9cc name="span" attributes=[#<Nokogiri::XML::Attr:0x3fcdb3adc968 name="style" value="color: #000">] children=[#<Nokogiri::XML::Text:0x3fcdb3dd6b50 " international holiday package bookings at Yatra.com ">]>, #<Nokogiri::XML::Text:0x3fcdb3dd5f5c " ">]>, #<Nokogiri::XML::Text:0x3fcdb3dd5a98 "\r\n\t\t\t\t\t\t\t\t\t\t\t\t">]> 

在终端上触发

agent.get("http://www.example.com/").search(".sidebar-deal-excerpt").first.children

给我这个：

 <Nokogiri::XML::Text:0x3fcdb399c3dc "\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t">, #<Nokogiri::XML::Element:0x3fcdb399c300 name="a" attributes=[#<Nokogiri::XML::Attr:0x3fcdb399c29c name="href" value="http://www.example.com/getaway-8774-yatra-september-deal">] children=[#<Nokogiri::XML::Text:0x3fcdb399bdd8 " ">, #<Nokogiri::XML::Element:0x3fcdb399bcfc name="span" attributes=[#<Nokogiri::XML::Attr:0x3fcdb399bc98 name="style" value="color: #000">] children=[#<Nokogiri::XML::Text:0x3fcdb399b7d4 "international holiday package bookings at Yatra.com ">]>, #<Nokogiri::XML::Text:0x3fcdb3dd8770 " ">]>, #<Nokogiri::XML::Text:0x3fcdb3dd6df8 "\r\n\t\t\t\t\t\t\t\t\t\t\t\t">]

问题是，我想从中获取 url。我想得到这个属性值

value="http://www.example.com/getaway-8774-yatra-september-deal"

即

   http://www.example.com/getaway-8774-yatra-september-deal

我该如何解析这个？

Answer 1

怎么样：（未经测试）

agent = Mechanize.new
page = agent.get("http://www.snapdeal.com/")
page = agent.get("http://www.snapdeal.com/") # yeah, you've got to call it twice for this site
urls = page.search(".sidebar-deal-excerpt a").collect{|a| a.attributes["href"].value }