如何使用Nokogiri解析和刮取URL的元标记？

Question

我正在使用Nokogiri来拉动<h1>和<title>标签,但我无法获得这些:

<meta name="description" content="I design and develop websites and applications.">
<meta name="keywords" content="web designer,web developer">

我有这个代码:

url = 'https://en.wikipedia.org/wiki/Emma_Watson' 
page = Nokogiri::HTML(open(url))

puts page.css('title')[0].text puts page.css('h1')[0].text
puts page.css('description')
puts META DESCRIPTION
puts META KEYWORDS

我查看了文档但没有找到任何内容.我会用正则表达式做这个吗？

谢谢.

Answer 1

这是我如何去做的:

require 'nokogiri'

doc = Nokogiri::HTML(<<EOT)
<meta name="description" content="I design and develop websites and applications.">
<meta name="keywords" content="web designer,web developer">
EOT

contents = %w[description keywords].map { |name|
  doc.at("meta[name='#{name}']")['content']
}
contents # => ["I design and develop websites and applications.", "web designer,web developer"]

要么:

contents = doc.search("meta[name='description'], meta[name='keywords']").map { |n| 
  n['content'] 
}
contents # => ["I design and develop websites and applications.", "web designer,web developer"]

Answer 2

那将是:

page.at('meta[name="keywords"]')['content']