请问最后爬不到数据是什么原因呢

[dg5566]

2020-07-18 19:03:56 [scrapy.middleware] INFO: Enabled item pipelines:
['sina.pipelines.MongoDBPipeline']
2020-07-18 19:03:56 [scrapy.core.engine] INFO: Spider opened
2020-07-18 19:03:56 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2020-07-18 19:03:56 [scrapy.extensions.telnet] INFO: Telnet console listening on 127.0.0.1:6023
2020-07-18 19:03:56 [py.warnings] WARNING: D:\study\Python3.7\lib\site-packages\scrapy\spiders_init_.py:81: UserWarning: Spider.make_requests_from_url method is deprecated: it will be removed and not be called by the default Spider.start_requests method in future Scrapy releases. Please override Spider.start_requests method instead.
warnings.warn(

[seaweiqing]

抓数据之前先自己上.cn按照设定的条件检索，看是否真的存在数据，才能进行下一步。你设定的条件返回的url就可以做验证。