收集评论中的答案(为公正起见将此答案设置为社区共享),以便回答这个问题: 苹果官方文档 http://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/Blocks/Mike Ash http://mikeash.com/pyblog/friday-qa-2009-08-14-practical-blocks.html Cocoa With Love http://cocoawithlove.com/2009/10/how-blocks-are-implemented-and.html。