问题
I'm using Nokogiri (Ruby Xpath library) to grep contents on web pages. Then I found problems with some web pages, such as Ajax web pages, and that means when I view source code I won't be seeing the exact contents such as <table>, etc.
How can I get the HTML code for the actual content?
回答1:
Don't use Nokogiri at all if you want the raw source of a web page. Just fetch the web page directly as a string, and then do not feed that to Nokogiri. For example:
require 'open-uri'
html = open('http://phrogz.net').read
puts html.length #=> 8461
puts html #=> ...raw source of the page...
If, on the other hand, you want the post-JavaScript-modified contents of a page (such as an AJAX library that executes JavaScript code to fetch new content and change the page), then you can't use Nokogiri. You need to use Ruby to control a web browser (e.g. read up on Selenium or Watir).
来源：https://stackoverflow.com/questions/10919422/how-to-get-the-raw-html-source-code-for-a-page-by-using-ruby-or-nokogiri