我要搬家到csdn，大家到那里来看我吧，平台更大，看到的人更多！

#encoding: utf-8

require 'net/http'
require 'open-uri'
require 'nokogiri' # 用于解析html的模块
# sudo apt-get install libxslt-dev libxml2-dev
# sudo gem install nokogiri
require 'pathname'

class JanDanSpider
attr_accessor :base_uri, :cur_page # 定义属性访问器

def initialize(pagesize)
@base_uri = 'http://jandan.net/pic' # @表示实例变量、@@表示类变量、$表示全局变量
@dir = '/media/Develop/MyCode/SevenLang/ruby/pic'
@pagesize = Integer(pagesize) # 整型转换
end

def crawl()
Dir.mkdir @dir unless File.directory? @dir # 表判断的方法结尾都有个?
totalpage = crawlpage(0)
puts "pagesize #{totalpage}" # ""字符会引发字符串替换，''则不会
(1..@pagesize-1).each do |i| # 遍历元组
crawlpage(totalpage - i)
end
puts 'complete!'
end

def crawlpage(page)
url = page==0 ? @base_uri : @base_uri+'/page-'+page.to_s # to_s是必要的
puts "crawl-page: #{url}"

fpage = open(url)
html = fpage.read
doc = Nokogiri::HTML(html)
doc.css('ol.commentlist li').each { |comment|
match = /comment-(\d+)/.match(comment['id'])
if match
id = match[1]
oo = Integer(comment.css('#cos_support'+'-'+id)[0].content);
xx = Integer(comment.css('#cos_unsupport'+'-'+id)[0].content);
xx = 1 if xx==0
if(oo>xx && (oo>200 || oo/xx >10) )
src = comment.css('p img')[0]["src"]
puts "crawl: oo #{oo} xx #{xx} src #{src}"
save_pic(src)
end
end
}
if page==0
cur_page = doc.css(".current-comment-page")[0].content
page = Integer(/\d+/.match(cur_page).to_s)
end
puts "page #{page} done!"
page # ruby中每条语句都有返回值，函数内最后一条语句的返回值会被return
end

def save_pic(url)
urlpath = Pathname.new(url)
filename = urlpath.basename.to_s
dirpath = Pathname.new(@dir)
filepath = dirpath.join(filename).to_s
open(url) { |fin|
open(filepath,"wb") { |fout|
while buf = fin.read(4096) do
fout.write buf
end
}
} unless File.exists? filepath # 仅当文件不存在时进行抓取
puts 'done!'
end

end

if ARGV.length == 1
spider = JanDanSpider.new($*[0]) # 可从 ARGV 或 $* 读取命令行参数
spider.crawl()
else
puts 'please input pagesize' #tip: puts, 转义+换行符 print, 转义 p, 换行
end

#python-string
#python中的字符串用单引号''和双引号""标示
strA = 'this is a string'
strB = "this is a message!"

#打印两个字符串
print("打印两个字符串")
print('strA = ' + strA)
print('strB = ' + strB)

print("#############################")

strC = 'I don\'t know anything'
strD = '\'Yes\',I know.'

print("字符串中的转移字符")
print('strA = ' + strC)
print('strB = ' + strD)

print("#############################")

strE = '这是我的blog，欢迎大家来\n我的博客园溜达'

print("字符串中的换行")
print('strA = ' + strE)

print("#############################")

strF = 'this is ''message'
strG = 'Hongten'
strH = strG * 3

print('字符串可以用\'+\'号连接(或者说粘合)，也可以用\'*\'号循环')
print('strF原有形式为：\'this is \'\'message\'')
print('粘合后的strF：' + strF)
print('strG原值为：\'Hongten\',strH = strG * 3,此时strH为：' + strH)

print("#############################")
strI = 'hongtenzone@foxmail.com'

print('字符串可以使用下标(索引)查询')
print('源字符串strI = \'hongtenzone@foxmail.com\'')
print('字符串strI的长度，len(strI) = ')
print(len(strI))
print('strI[0] = ' + strI[0])
print('strI[10] = ' + strI[10])
print('strI[-1] = strI[len(strI) - 1]')
print('strI[-1] = ' + strI[-1])
print('strI[len(strI) - 1] = ' + strI[len(strI) - 1])

print("#############################")

print('Python 字符串不能改写。按字符串索引赋值会产生错误:')
print('strI[0] = \'x\',这样就会产生错误啦')

print("#############################")

print('过大的索引代替为字符串大小，下界比上界大的返回空字符串')
print('strI[0:100] = ' + strI[0:100])

print("#############################")

print('索引可以是负数，计数从右边开始')
print('strI[-2] = ' + strI[-2])
print('strI[-23:] = ' + strI[-23:])

print("#############################")

print('不过-0 还是0，所以它不是从右边计数的！')
print('strI[0] = ' + strI[0])
print('strI[-0] = ' + strI[-0])

/*
* PROXY_HOST：代理的IP地址
* PROXY_PORT_INT：代理的端口号
*/
Proxy proxy=newProxy(Proxy.Type.HTTP, newInetSocketAddress(PROXY_HOST, PROXY_PORT_INT));
URL url=newURL(urlStr);
URLConnection conn=url.openConnection(proxy);
InputStream is=conn.getInputStream();

/**
* 这里只实现垂直滚动
*/
var parent = document.getElementById('parent');
var content = document.getElementById('content')
var startY = 0; // 初始位置
var lastY = 0; // 上一次位置

parent.addEventListener('touchstart', function(e) {
lastY = startY = e.touches[0].pageY;
});
parent.addEventListener('touchmove', function(e) {
var nowY = e.touches[0].pageY;
var moveY = nowY - lastY;
var contentTop = content.style.top.replace('px', '');
// 设置top值移动content
content.style.top = (parseInt(contentTop) + moveY) + 'px';
lastY = nowY;

});
parent.addEventListener('touchend', function(e) {
// do touchend
var nowY = e.touches[0].pageY;
var moveY = nowY - lastY;
var contentTop = content.style.top.replace('px', '');
// 设置top值移动content
content.style.top = (parseInt(contentTop) + moveY) + 'px';
lastY = nowY;
});

/**
* 这里只实现垂直滚动
*/
var parent = document.getElementById('parent');
var content = document.getElementById('content')
var startY = 0; // 初始位置
var lastY = 0; // 上一次位置

parent.addEventListener('touchstart', function(e) {
lastY = startY = e.touches[0].pageY;
});
parent.addEventListener('touchmove', function(e) {
var nowY = e.touches[0].pageY;
var moveY = nowY - lastY;
var contentTop = content.style.top.replace('px', '');
// 设置top值移动content
content.style.top = (parseInt(contentTop) + moveY) + 'px';
lastY = nowY;

});
parent.addEventListener('touchend', function(e) {
// do touchend
var nowY = e.touches[0].pageY;
var moveY = nowY - lastY;
var contentTop = content.style.top.replace('px', '');
// 设置top值移动content
content.style.top = (parseInt(contentTop) + moveY) + 'px';
lastY = nowY;
});