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本文介绍 Flow 的注释型语法（Comment-based Syntax）：通过 /*: */、/*:: */ 与 /*flow-include 三种特殊注释，把 Flow 专属的类型语法内嵌在普通 JavaScript 块注释中，使代码无需经过剥离 Flow 语法的构建步骤即可直接运行。该特性最早随 Flow 0.4.0 引入（详见仓库中的 历史公告 ...

这些 callbacks 之所以之后才执行，是因为 setTimeout会安排它们在当前同步代码执行完成之后运行。 这里重要的是，当你处理 closure 时，需要理解捕获的是哪个变量，以及它属于哪个 environment，而不是简单地认为函数保存的是变量的一个固定副本。 7.

异步编程是 JavaScript 开发中绕不开的核心课题：无论是 Node.js 中的文件读写、网络请求，还是浏览器端的图片加载、fetch 调用，都需要妥善管理回调、并发与错误处理。Async 是一个专门为这类场景设计的工具模块，提供了直接、强大且经过充分测试的异步流程 ...

When writing JavaScript, you encounter callback functions almost every day. map, filter, addEventListener, setTimeout, Promise's then... the list goes on and on. There is a point I always keep in mind ...