Closure 通常被认为是 Java 中最重要的概念之一。 它们出现在 callbacks、event handlers、factory functions、timers、modules 以及很多其他地方。 但 closure 到底是什么？ 一个常见的、简化的解释是： Closure 是一个能够记住其外部作用域中变量的函数。

本文围绕《You Don't Know JS Yet: Scope & Closures》（第2版）第 2 章展开，系统讲解如何用"彩色弹珠与桶""作用域气泡""引擎内部对话""办公楼"四套隐喻建立对**词法作用域（Lexical Scope）**的准确心智模型。读完本文，你将能够像 JS 引擎一样思考：区分编译期声明与运行 ...

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