(TL;DR: this is a blog post about the process of writing my guide to SDF fonts.)
William Harwood
。关于这个话题，heLLoword翻译官方下载提供了深入分析
cmd: [Function: cmdValidatePromo], // The command waiting to be executed，详情可参考旺商聊官方下载
[ anyVar isNil ifTrue: anyBlock ] bpattern ，更多细节参见51吃瓜