要执行蜘蛛，请在 first_scrapy 目录中运行以下命令 :
scrapy crawl first
其中， first 是创建蜘蛛时指定的蜘蛛的名称.
蜘蛛爬行后，您可以看到以下输出 :
2016-08-09 18:13:07-0400 [scrapy] INFO: Scrapy started (bot: tutorial)
2016-08-09 18:13:07-0400 [scrapy] INFO: Optional features available: ...
2016-08-09 18:13:07-0400 [scrapy] INFO: Overridden settings: {}
2016-08-09 18:13:07-0400 [scrapy] INFO: Enabled extensions: ...
2016-08-09 18:13:07-0400 [scrapy] INFO: Enabled downloader middlewares: ...
2016-08-09 18:13:07-0400 [scrapy] INFO: Enabled spider middlewares: ...
2016-08-09 18:13:07-0400 [scrapy] INFO: Enabled item pipelines: ...
2016-08-09 18:13:07-0400 [scrapy] INFO: Spider opened
2016-08-09 18:13:08-0400 [scrapy] DEBUG: Crawled (200)
<GET http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/> (referer: None)
2016-08-09 18:13:09-0400 [scrapy] DEBUG: Crawled (200)
<GET http://www.dmoz.org/Computers/Programming/Languages/Python/Books/> (referer: None)
2016-08-09 18:13:09-0400 [scrapy] INFO: Closing spider (finished)As您可以在输出中看到，对于每个URL，都有一个日志行，其中(引用者:无)表明URL是起始URL并且没有引用者.接下来，您应该会在 first_scrapy 目录中看到两个名为 Books.html 和 Resources.html 的新文件.
