2013年(2)
发布时间:2013-06-24 21:24:47
类扩展,是 Objective-C 2.0 为分类(Category)添加的一个非常有用的功能。见以下示例代码:点击(此处)折叠或打开@interface Person ()- (BOOL)canVote;@end类扩展的声明方式和分类很像,区别只是括号内的分类名为空。一个典型的类扩展的写法为:.........【阅读全文】
发布时间:2013-06-20 13:23:46
什么是 Scrapy?Scrapy is a fast high-level screen scraping and web crawling framework, used to crawl websites and extract structured data from their pages. It can be used for a wide range of purposes, from data mining to monitoring and automated testing.特性Simple.........【阅读全文】