Classes are not strictly required for message passing (Self demonstrated this long ago), but they exist to create structure: to group behavior within a coherent context. So when you look at the browser, you should also look at it like this:
Why the FT?See why over a million readers pay to read the Financial Times.
Фото: Daniel Cole / Reuters，详情可参考PDF资料
如果将 iPhone 发布的 2007 年视为智能手机的元年，那么到今天，已经狂奔了近二十年。
，这一点在快连下载安装中也有详细论述
未来 3-5 年，中国消费市场将呈现消费升级与消费分级并行演进的态势。，更多细节参见PDF资料
The other building