selenium和casperjs2種數據抓取方式(進來的朋友請留言，共同探討

#!/usr/bin/python
# -*- coding: utf-8 -*-

from selenium import webdriver
from bs4 import BeautifulSoup

import time
import sys
reload(sys)
sys.setdefaultencoding('utf-8')

def catchDate(s):
 """頁面數據提取"""
 soup = BeautifulSoup(s)
 z = []
 
 m = soup.findAll("ul",class_="course-item-list-div-list")
 
 for obj in m:
 try:
 print obj.previous_sibling.find('h3').get_text()
 tmp = obj.findAll('li', class_="unviewed")
 for eachli in tmp:
 titleli = eachli.find('a').get_text()
 print ' '+titleli
 allaInEachDiv = eachli.find('div', class_="course-lecture-item-resource").findAll('a')
 for eacha in allaInEachDiv:
 print ' '+eacha['href']
 except Exception, e:
 continue
 if(tmp != ""):
 z.append(tmp)
 return z

starttime = time.time()
driver = webdriver.PhantomJS(executable_path='C:\phantomjs-1.9.7-windows\phantomjs.exe')
driver.get("https://class.coursera.org/nlp/lecture")
html = driver.page_source
content = catchDate(html)
endtime = time.time()
print endtime - starttime
driver.quit

var casper = require("casper").create({
	clientScripts: ["jquery-1.7.js"], 
 stepTimeout: 120 * 1000, 
 pageSettings: { 
 loadImages: false 
 }, 
 verbose: true, 
 logLevel: "error" 
}); 
var numberOfLinks = 0;

var fs = require('fs');
var filename = 'content.txt';
var fullContent = "";
var startTime = new Date(), endTime;
 
casper.start("https://class.coursera.org/nlp/lecture", function() {
 numberOfLinks = this.evaluate(function() {
 return __utils__.findAll('.course-item-list-div-list').length;
 });
 this.echo(numberOfLinks + " items found");
});
getStartTime = function(){
	this.echo(startTime);
	this.then(getcontent);
};
getcontent = function() {
 fullContent = this.evaluate(function() {
 var content = "";
 jQuery('.course-item-list-div-list').each(function() {
	var btitle = $(this).prev().find("h3").text();
	content += btitle + '\r\n';
	$(this).find("li").each(function(){
	var stitle = $(this).find("a").first().text();
	content += stitle + '\r';
	$(this).find("div a").each(function(){
	content += $(this).attr("href")+'\r';
	});
	content += '\r\n';
	});
	content += '\r\n\r\n';
 });
 return content;
 });
	this.then(writefile);
};

writefile = function() {
 this.echo('writing to ' + filename);
 fs.write(filename, fullContent, 'w');
	this.then(getEndTime);
};
getEndTime = function(){
	endTime = new Date();
}
casper.then(getStartTime);
casper.then(function exitSystem() {
	this.echo(new Date() - startTime);
 casper.exit(); 
}); 

casper.run();