我正在解析评级网站，以找出某家公司的评分。
评分可能会在1和5之间变化，并且可以使用以下代码提取它们：
a = Mechanize.new
page = a.get(url)
reviews = page.search(".reviewcontent")
reviews.each do |r|
rating = r.at_css(".s1, .s2, .s3, .s4, .s5")
puts rating # => <span class="s5" itemprop="reviewRating" itemscope itemtype="http://schema.org/Rating">
<meta itemprop="worstRating" content="1">
<meta itemprop="bestRating" content="5">
<meta itemprop="ratingValue" content="5"></span>
puts rating.inspect # => #<Nokogiri::XML::Element:0x3fe0e108783c name="span" attributes=[#<Nokogiri::XML::Attr:0x3fe0e1087440 name="class" value="s5">, #<Nokogiri::XML::Attr:0x3fe0e108742c name="itemprop" value="reviewRating">, #<Nokogiri::XML::Attr:0x3fe0e1087404 name="itemscope">, #<Nokogiri::XML::Attr:0x3fe0e10873dc name="itemtype" value="http://schema.org/Rating">] children=[#<Nokogiri::XML::Text:0x3fe0e108648c "\r\n ">, #<Nokogiri::XML::Element:0x3fe0e108634c name="meta" attributes=[#<Nokogiri::XML::Attr:0x3fe0e108625c name="itemprop" value="worstRating">, #<Nokogiri::XML::Attr:0x3fe0e1086248 name="content" value="1">]>, #<Nokogiri::XML::Element:0x3fe0e10898bc name="meta" attributes=[#<Nokogiri::XML::Attr:0x3fe0e10897cc name="itemprop" value="bestRating">, #<Nokogiri::XML::Attr:0x3fe0e10897b8 name="content" value="5">]>, #<Nokogiri::XML::Element:0x3fe0e1088b10 name="meta" attributes=[#<Nokogiri::XML::Attr:0x3fe0e1088994 name="itemprop" value="ratingValue">, #<Nokogiri::XML::Attr:0x3fe0e1088980 name="content" value="5">]>]>
end
我对此行感兴趣：<meta itemprop="ratingValue" content="5">，特别是content的vaule，在这种情况下为5。
如何提取此值？
编辑：
puts reviews.to_html给出了这个结果：
<div class="reviewcontent">
<p class="r-m ">
<span class="s5" itemprop="reviewRating" itemscope itemtype="http://schema.org/Rating">
<meta itemprop="worstRating" content="1">
<meta itemprop="bestRating" content="5">
<meta itemprop="ratingValue" content="5"></span>
</p>
<time datetime="2011-09-15T18:16:10.0000000+02:00" class="ndate strong" title="15. september 2011 - 18:16:10" pubdate>
15. september 2011
<span title="2011-09-15T18:16:10.0000000+02:00"></span>
</time><meta itemprop="dateCreated" content="2011-09-15T18:16:10.0000000+02:00">
<h3 itemprop="headline" class="summary da">
<a href="http://www.trustpilot.dk/review/scandicfly.dk/4e7240ea00006400020e3b0e" class="showReview">Tip Top</a>
</h3>
<p itemprop="reviewBody">
Bestilte en del fluer, en krogskærper og andre småting.<br>Kom 3 dage efter bestilling og alt var, som det skulle.
</p>
<span class="imagezoom">
</span>
<div class="actions">
<input type="hidden" name="ReviewId" value="4e7240ea00006400020e3b0e"><input type="hidden" name="UserName" value="Strit"><a href="http://www.trustpilot.dk/review/scandicfly.dk/4e7240ea00006400020e3b0e#allcomments" class="comments fb-comments-label" id="FB-comment-box-0">
<span></span>
Kommentar (<comments-count href="http://trustpilot.com/review/scandicfly.dk#4e7240ea00006400020e3b0e">?</comments-count>)
</a>
<a class="useful" data-reviewid="4e7240ea00006400020e3b0e" href="#"><span> </span>
Find nyttig
</a>
<a class="replyAsCompany" href="#"><span></span>
Svar som firma
</a>
<a class="report" data-reviewid="932622" href="#"><span></span>
Rapportér
</a>
</div>
<div class="fb-comments-wrapper">
<div class="social-guidelines"><a href="/social">Sociale retningslinjer</a></div>
</div>
<div class="companyComments" id="CompanyComments_932622">
<div class="companyComments" id="CompanyComments_4e7240ea00006400020e3b0e">
</div>
</div>
</div><div class="reviewcontent">
<p class="r-m ">
<span class="s5" itemprop="reviewRating" itemscope itemtype="http://schema.org/Rating">
<meta itemprop="worstRating" content="1">
<meta itemprop="bestRating" content="5">
<meta itemprop="ratingValue" content="5"></span>
</p>
<time datetime="2011-04-05T16:05:06.0000000+02:00" class="ndate" title="5. april 2011 - 16:05:06" pubdate>
5. april 2011
<span title="2011-04-05T16:05:06.0000000+02:00"></span>
</time><meta itemprop="dateCreated" content="2011-04-05T16:05:06.0000000+02:00">
<h3 itemprop="headline" class="summary da">
<a href="http://www.trustpilot.dk/review/scandicfly.dk/4d9b3db2000064000209035f" class="showReview">en god og flot oplevelse</a>
</h3>
<p itemprop="reviewBody">
Købte en fiskestang hos ScandicFly. Faktra ordrebekræftigelse og det hele præsenteret meget flot. Der kom desuden et notis om min fiskestang var afsendt.<br>Et par dage efter kom min fiskestang med posten forsvarligt pakket ind.
</p>
<span class="imagezoom">
</span>
<div class="actions">
<input type="hidden" name="ReviewId" value="4d9b3db2000064000209035f"><input type="hidden" name="UserName" value="Peter Leter"><a href="http://www.trustpilot.dk/review/scandicfly.dk/4d9b3db2000064000209035f#allcomments" class="comments fb-comments-label" id="FB-comment-box-1">
<span></span>
Kommentar (<comments-count href="http://trustpilot.com/review/scandicfly.dk#4d9b3db2000064000209035f">?</comments-count>)
</a>
<a class="useful" data-reviewid="4d9b3db2000064000209035f" href="#"><span></span>
Find nyttig
</a>
<a class="replyAsCompany" href="#"><span></span>
Svar som firma
</a>
<a class="report" data-reviewid="590687" href="#"><span></span>
Rapportér
</a>
</div>
<div class="fb-comments-wrapper">
<div class="social-guidelines"><a href="/social">Sociale retningslinjer</a></div>
</div>
<div class="companyComments" id="CompanyComments_590687">
<div class="companyComments" id="CompanyComments_4d9b3db2000064000209035f">
</div>
</div>
答案 0 :(得分：3)
之后你可以在xpath以下：
require 'nokogiri'
doc = Nokogiri::HTML::Document.parse <<-_HTML_
<span class="s5" itemprop="reviewRating" itemscope itemtype="http://schema.org/Rating">
<meta itemprop="worstRating" content="1">
<meta itemprop="bestRating" content="5">
<meta itemprop="ratingValue" content="5">
</span>
_HTML_
doc.at("//meta[@itemprop = 'bestRating']/@content").to_s
# => "5"
在您的情况下写如下：
r.at_css(".s1, .s2, .s3, .s4, .s5").at("//meta[@itemprop = 'bestRating']/@content").to_s
答案 1 :(得分：0)
只是为了清理Babai的答案，怎么样：
doc.at('meta[itemprop="bestRating"]')[:content]
实际上你可能只有：
rating[:class][/\d/]
看看为什么？