使用scrapy爬取百度招聘

百度招聘都是通过ajax返回的数据，用scrapy爬就很尴尬了。
建模，items文件：

 1 # -*- coding: utf-8 -*-
 2 
 3 # Define here the models for your scraped items
 4 #
 5 # See documentation in:
 6 # http://doc.scrapy.org/en/latest/topics/items.html
 7 
 8 import scrapy
 9 
10 
11 class BaiduItem(scrapy.Item):
12     # 职位名称
13     job_name = scrapy.Field()
14     # 职位类别
15     job_type = scrapy.Field()
16     # 工作地点
17     address = scrapy.Field()
18     # 招聘人数
19     number = scrapy.Field()
20     # 更新时间
21     pub_time = scrapy.Field()
22     # 详情页面  ref="#/jobDetail/2/1345536716"
23     detail_link = scrapy.Field()
24     # 工作职责
25     duty = scrapy.Field()
26     # 职责要求
27     require = scrapy.Field()
28     pass

items.py