Web Scraping返回空字符串

Question

我写了一些代码来返回并显示this website上的五个最近的帖子。然而，当我使用for循环运行代码时，会返回一个空字符串。代码如下：

require 'rubygems' 
require 'mechanize' 

agent = Mechanize.new 
site = "http://metarand.com" 
page = agent.get(site) 

for i in 1..5 
    puts "#{i}) - #{page.search("#boxes :nth-child(i) .clearfix .blog-title")}" 
end 

代码有什么问题，以及如何修复它？

Answer 1

我相信，你需要像：

(1..5).each {|i| puts %Q~#{i} - #{page.at("#boxes :nth-child(#{i}) .clearfix .blog-title").text}~ } 

Answer 2

agent = Mechanize.new 
site = "http://metarand.com" 
agent.get(site) do |page| 
    for i in 1..5 
    puts %Q~#{i} - #{page.search("#boxes :nth-child(#{i}) .clearfix .blog-title")}~ 
    end 
end 

Answer 3

简单的错误：

puts "#{i}) - #{page.search("#boxes :nth-child(i) .clearfix .blog-title")}" 
               ^^^ 

应该是：#{i}