module CommonHelper  require 'nokogiri' require 'open-uri'  def down_load_xmz  site_url = "http://www.xxx.com"   for index_page in 1..141   doc_html = Nokogiri::HTML(open(site_url+'/share/comment-page-'+index_page.to_s))   doc_html.css("#comments p img").each do |item_img|    puts item_img[:src]    download_img(item_img[:src])   end  end end  ########下載圖片 def download_img(img_url)  begin   img_file = open(img_url) { |f| f.read }   file_name = img_url.split('/').last   #puts file_name   open("public/meizi/"+file_name, "wb") { |f| f.write(img_file) }   return "/public/meizi/"+file_name  rescue => err   puts err   return ''  end end end