我正在尝试使用 nokogiri 选择一个 DOM 元素，但它似乎返回一个空数组。
我运行这段代码：
require "open-uri"
require "nokogiri"
doc = Nokogiri::HTML(open("http://twitter.com/#!/ladygaga"))
它会返回 Nokogiri 解析的整个源代码。
但是，当我运行时
doc.css(".stream-tweet")
它返回一个空数组。 .stream-tweet 是 http://twitter.com/#!/ladygaga 的多个 div 元素的类，我通过检查源代码发现。
这是怎么回事？
【问题讨论】：
标签： html ruby-on-rails parsing screen-scraping nokogiri
因为如果您查看doc，则没有具有stream-tweet 类的div 元素。
该 div 之后会通过对 twitter api 的 AJAX 请求加载。
【讨论】：
doc 格式更好？另外，“之后通过 javascript twitter api 加载实际 div”到底是什么意思。
@NARKOZ 对您的问题有正确的答案，即您为什么尝试做的事情不起作用。你应该接受这个答案。
要解决你的问题，试试这个：
require 'open-uri'
require 'json'
require 'pp'
gaga = JSON.parse(open('http://api.twitter.com/1/statuses/user_timeline.json?include_entities=1&include_available_features=1&contributor_details=true&include_rts=true&user_id=14230524').read)
pp gaga.map{ |tweet| tweet['text'] }[0..3]
#=> ["Here's my LIVE radio performance on the Howard Stern Show! http://bit.ly/pighVL\"",
#=> "Thanks baby. I'm a die hard monsterfan RT@GSp0nz: @ladygaga 's album speaks to me more than any other album ever. #diehardfan",
#=> "http://twitpic.com/5s4f2h - Just left @HowardStern, rockers with long hair have a sweetspot for girls like me. He was a doll. :)",
#=> "SURPRISE MONSTERS! You can find a link to a more readable format of my V Mag Pop Culture Column on http://t.co/ekIJBXo My new blog!"]
这是整个 JSON 看起来像一个 Ruby 哈希数组（因堆栈溢出而被截断）：
[{"in_reply_to_status_id"=>nil,
"user"=>
{"time_zone"=>"Quito",
"friends_count"=>142497,
"protected"=>false,
"location"=>"New York, NY",
"is_translator"=>false,
"following"=>true,
"profile_use_background_image"=>true,
"name"=>"Lady Gaga",
"follow_request_sent"=>false,
"statuses_count"=>968,
"profile_background_color"=>"9AE4E8",
"url"=>"http://www.ladygaga.com",
"default_profile"=>false,
"verified"=>true,
"profile_background_image_url"=>
"http://a1.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
"utc_offset"=>-18000,
"profile_background_image_url_https"=>
"https://si0.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
"favourites_count"=>2,
"created_at"=>"Wed Mar 26 22:37:48 +0000 2008",
"profile_text_color"=>"333333",
"profile_image_url_https"=>
"https://si0.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
"profile_image_url"=>
"http://a1.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
"listed_count"=>208144,
"profile_sidebar_fill_color"=>"DDFFCC",
"description"=>"mother mons\u2020er\r\n",
"contributors_enabled"=>false,
"lang"=>"en",
"profile_background_tile"=>true,
"followers_count"=>11781463,
"screen_name"=>"ladygaga",
"id_str"=>"14230524",
"profile_link_color"=>"0084B4",
"id"=>14230524,
"default_profile_image"=>false,
"show_all_inline_media"=>false,
"geo_enabled"=>false,
"notifications"=>true,
"profile_sidebar_border_color"=>"BDDCAD"},
"created_at"=>"Tue Jul 19 18:09:40 +0000 2011",
"geo"=>nil,
"in_reply_to_user_id"=>nil,
"favorited"=>false,
"text"=>
"Here's my LIVE radio performance on the Howard Stern Show! http://bit.ly/pighVL\"",
"in_reply_to_status_id_str"=>nil,
"entities"=>
{"user_mentions"=>[],
"urls"=>
[{"url"=>"http://bit.ly/pighVL",
"indices"=>[59, 79],
"expanded_url"=>nil}],
"hashtags"=>[]},
"in_reply_to_screen_name"=>nil,
"in_reply_to_user_id_str"=>nil,
"place"=>nil,
"coordinates"=>nil,
"truncated"=>false,
"source"=>
"<a href=\"http://blackberry.com/twitter\" rel=\"nofollow\">Twitter for BlackBerry\u00AE</a>",
"id_str"=>"93382007496769536",
"contributors"=>nil,
"retweeted"=>false,
"retweet_count"=>"100+",
"id"=>93382007496769536},
{"in_reply_to_status_id"=>nil,
"user"=>
{"time_zone"=>"Quito",
"protected"=>false,
"location"=>"New York, NY",
"contributors_enabled"=>false,
"following"=>true,
"profile_use_background_image"=>true,
"name"=>"Lady Gaga",
"default_profile_image"=>false,
"profile_background_color"=>"9AE4E8",
"url"=>"http://www.ladygaga.com",
"default_profile"=>false,
"verified"=>true,
"profile_background_image_url"=>
"http://a1.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
"utc_offset"=>-18000,
"friends_count"=>142497,
"is_translator"=>false,
"show_all_inline_media"=>false,
"geo_enabled"=>false,
"favourites_count"=>2,
"created_at"=>"Wed Mar 26 22:37:48 +0000 2008",
"follow_request_sent"=>false,
"profile_text_color"=>"333333",
"profile_image_url"=>
"http://a1.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
"profile_sidebar_fill_color"=>"DDFFCC",
"description"=>"mother mons\u2020er\r\n",
"lang"=>"en",
"statuses_count"=>968,
"profile_background_tile"=>true,
"followers_count"=>11781456,
"screen_name"=>"ladygaga",
"id_str"=>"14230524",
"listed_count"=>208145,
"profile_background_image_url_https"=>
"https://si0.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
"profile_link_color"=>"0084B4",
"id"=>14230524,
"notifications"=>false,
"profile_sidebar_border_color"=>"BDDCAD",
"profile_image_url_https"=>
"https://si0.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg"},
"created_at"=>"Tue Jul 19 17:51:11 +0000 2011",
"geo"=>nil,
"in_reply_to_user_id"=>nil,
"favorited"=>false,
"text"=>
"Thanks baby. I'm a die hard monsterfan RT@GSp0nz: @ladygaga 's album speaks to me more than any other album ever. #diehardfan",
"in_reply_to_status_id_str"=>nil,
"entities"=>
{"hashtags"=>[{"indices"=>[115, 126], "text"=>"diehardfan"}],
"user_mentions"=>
[{"name"=>"Lady Gaga",
"indices"=>[50, 59],
"screen_name"=>"ladygaga",
"id_str"=>"14230524",
"id"=>14230524}],
"urls"=>[]},
"in_reply_to_screen_name"=>nil,
"in_reply_to_user_id_str"=>nil,
"place"=>nil,
"coordinates"=>nil,
"truncated"=>false,
"source"=>
"<a href=\"http://blackberry.com/twitter\" rel=\"nofollow\">Twitter for BlackBerry\u00AE</a>",
"id_str"=>"93377358974812161",
"contributors"=>nil,
"retweeted"=>false,
"retweet_count"=>"100+",
"id"=>93377358974812161},
{"in_reply_to_status_id"=>nil,
"user"=>
{"time_zone"=>"Quito",
"protected"=>false,
"location"=>"New York, NY",
"listed_count"=>208144,
"following"=>false,
"profile_use_background_image"=>true,
"profile_background_image_url_https"=>
"https://si0.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
"name"=>"Lady Gaga",
"profile_background_color"=>"9AE4E8",
"url"=>"http://www.ladygaga.com",
"profile_image_url_https"=>
"https://si0.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
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"http://a1.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
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"contributors_enabled"=>false,
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"created_at"=>"Wed Mar 26 22:37:48 +0000 2008",
"default_profile_image"=>false,
"profile_text_color"=>"333333",
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"http://a1.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
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"description"=>"mother mons\u2020er\r\n",
"is_translator"=>false,
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"lang"=>"en",
"geo_enabled"=>false,
"profile_background_tile"=>true,
"followers_count"=>11781392,
"screen_name"=>"ladygaga",
"follow_request_sent"=>false,
"id_str"=>"14230524",
"profile_link_color"=>"0084B4",
"id"=>14230524,
"statuses_count"=>968,
"notifications"=>false,
"profile_sidebar_border_color"=>"BDDCAD"},
"created_at"=>"Mon Jul 18 14:30:46 +0000 2011",
"geo"=>nil,
"in_reply_to_user_id"=>nil,
"favorited"=>false,
"text"=>
"http://twitpic.com/5s4f2h - Just left @HowardStern, rockers with long hair have a sweetspot for girls like me. He was a doll. :)",
"in_reply_to_status_id_str"=>nil,
"entities"=>
{"hashtags"=>[],
"user_mentions"=>
[{"name"=>"Howard Stern",
"indices"=>[38, 50],
"screen_name"=>"HowardStern",
"id_str"=>"246481013",
"id"=>246481013}],
"urls"=>
[{"url"=>"http://twitpic.com/5s4f2h",
"indices"=>[0, 25],
"expanded_url"=>nil}]},
"in_reply_to_screen_name"=>nil,
"in_reply_to_user_id_str"=>nil,
"place"=>nil,
"coordinates"=>nil,
"truncated"=>false,
"source"=>
"<a href=\"http://blackberry.com/twitter\" rel=\"nofollow\">Twitter for BlackBerry\u00AE</a>",
"id_str"=>"92964531315294209",
"contributors"=>nil,
"retweeted"=>false,
"retweet_count"=>"100+",
"id"=>92964531315294209},
{"in_reply_to_status_id"=>nil,
"user"=>
{"follow_request_sent"=>false,
"time_zone"=>"Quito",
"protected"=>false,
"location"=>"New York, NY",
"show_all_inline_media"=>false,
"following"=>true,
"geo_enabled"=>false,
"profile_use_background_image"=>true,
"name"=>"Lady Gaga",
"default_profile"=>false,
"profile_background_color"=>"9AE4E8",
"url"=>"http://www.ladygaga.com",
"verified"=>true,
"profile_background_image_url"=>
"http://a1.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
"utc_offset"=>-18000,
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"statuses_count"=>968,
"profile_background_image_url_https"=>
"https://si0.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
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"created_at"=>"Wed Mar 26 22:37:48 +0000 2008",
"profile_text_color"=>"333333",
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"https://si0.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
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"http://a1.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
"profile_sidebar_fill_color"=>"DDFFCC",
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"contributors_enabled"=>false,
"lang"=>"en",
"profile_background_tile"=>true,
"followers_count"=>11781425,
"screen_name"=>"ladygaga",
"default_profile_image"=>false,
"id_str"=>"14230524",
"friends_count"=>142497,
"profile_link_color"=>"0084B4",
"id"=>14230524,
"is_translator"=>false,
"notifications"=>false,
"profile_sidebar_border_color"=>"BDDCAD"},
"created_at"=>"Mon Jul 18 11:24:18 +0000 2011",
"geo"=>nil,
"in_reply_to_user_id"=>nil,
"favorited"=>false,
"text"=>
"SURPRISE MONSTERS! You can find a link to a more readable format of my V Mag Pop Culture Column on http://t.co/ekIJBXo My new blog!",
"in_reply_to_status_id_str"=>nil,
"entities"=>
{"user_mentions"=>[],
"urls"=>
[{"url"=>"http://t.co/ekIJBXo",
"display_url"=>"tinyurl.com/3p42npn",
"indices"=>[99, 118],
"expanded_url"=>"http://tinyurl.com/3p42npn"}],
"hashtags"=>[]},
"in_reply_to_screen_name"=>nil,
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"place"=>nil,
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"truncated"=>false,
"source"=>"web",
"id_str"=>"92917605253386241",
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"protected"=>false,
"location"=>"New York, NY",
"default_profile"=>false,
"following"=>false,
"profile_use_background_image"=>true,
"name"=>"Lady Gaga",
"profile_background_color"=>"9AE4E8",
"url"=>"http://www.ladygaga.com",
"is_translator"=>false,
"default_profile_image"=>false,
"verified"=>true,
"profile_background_image_url_https"=>
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"profile_text_color"=>"333333",
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"geo"=>nil,
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"favorited"=>false,
"text"=>
"http://twitpic.com/5s1f29 - If you need a quick fashion read, here's my V Mag column for the month. This time we did a Triptych!",
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"source"=>
"<a href=\"http://blackberry.com/twitter\" rel=\"nofollow\">Twitter for BlackBerry\u00AE</a>",
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"id"=>92905355444621313},
{"in_reply_to_status_id"=>nil,
"user"=>
{"time_zone"=>"Quito",
"protected"=>false,
"location"=>"New York, NY",
"is_translator"=>false,
"following"=>true,
"profile_use_background_image"=>true,
"profile_background_image_url_https"=>
"https://si0.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
"name"=>"Lady Gaga",
"follow_request_sent"=>false,
"friends_count"=>142497,
"profile_background_color"=>"9AE4E8",
"url"=>"http://www.ladygaga.com",
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"profile_background_image_url"=>
"http://a1.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
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"screen_name"=>"ladygaga",
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"https://si0.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
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"geo"=>nil,
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"text"=>
"I'm live with @howardstern 2moro morning on Sirius XM. Big fan. Gonna sing my face off, and talk shit w the raddest Hair in radio. 8am EDT",
"in_reply_to_status_id_str"=>nil,
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"indices"=>[14, 26],
"screen_name"=>"HowardStern",
"id_str"=>"246481013",
"id"=>246481013}],
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"source"=>
"<a href=\"http://blackberry.com/twitter\" rel=\"nofollow\">Twitter for BlackBerry\u00AE</a>",
"id_str"=>"92727984666066944",
"contributors"=>nil,
"retweeted"=>false,
"retweet_count"=>"100+",
"id"=>92727984666066944},
{"retweeted_status"=>
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"text"=>
"LOL. That's gonna be..interesting..RT @jeff1317 Howard Stern is back tomorrow and @ladygaga is a guest! Should make for great radio!",
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{"name"=>"Lady Gaga",
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【讨论】：