1.在爬虫文件中只需要解析提取出图片地址，然后将地址提交给管道
在管道文件对图片进行下载和持久化存储
class ImgSpider(scrapy.Spider):
name = 'img'
# allowed_domains = ['www.xxx.com']
start_urls = ['http://www.521609.com/daxuemeinv/']
url = 'http://www.521609.com/daxuemeinv/list8%d.html'
pageNum = 1
def parse(self, response):
li_list
