需要从一个已有的系统中抓取数据。对方不提供接口，只能从页面中爬取。网页源码中看不到数据，不知如何下手。需要用到哪些工具？抓取的流程？怎么实现系统的登陆以及模拟查询等操作？
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Perhaps there is no need to crawl, extjs needs to provide JSON data, and it is easy to obtain the data by finding the data source location. It is much easier to analyze JSON than to analyze HTML.
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Perhaps there is no need to crawl, extjs needs to provide JSON data, and it is easy to obtain the data by finding the data source location. It is much easier to analyze JSON than to analyze HTML.