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@ -108,6 +108,20 @@ JS 数据类型分为两大类及八种数据类型，注意别漏了 ES6 新增
- [ ] [JavaScript 的静态作用域链与“动态”闭包链](https://juejin.cn/post/6957913856488243237)
- [ ] [知乎中关于闭包的讨论](https://www.zhihu.com/question/34210214)
### 作用域
作用域是指程序中定义变量的区域，该位置决定了变量的生命周期，也就是变量和函数的可访问范围。
- [ ] 文档
- [ ] [作用域](https://developer.mozilla.org/en-US/docs/Glossary/Scope)
- [ ] [块作用域](https://developer.mozilla.org/en-US/docs/Glossary/Block/Scripting)
- [ ] 推荐文章
- [ ] [JavaScript 深入之词法作用域和动态作用域](https://github.com/mqyqingfeng/Blog/issues/3)
- [ ] [JavaScript 深入之作用域链](https://github.com/mqyqingfeng/Blog/issues/6)
- [ ] [Variable scope, closure](https://javascript.info/closure)，另有 [中文翻译版](https://zh.javascript.info/closure)
- [ ] [You Don't Know JS Yet: Scope & Closures](https://github.com/getify/You-Dont-Know-JS/tree/2nd-ed/scope-closures)
- [ ] [The battle between function scope and block scope](https://www.deadcoderising.com/2017-04-11-es6-var-let-and-const-the-battle-between-function-scope-and-block-scope/)
### 事件循环
大家都知道 JS 是一门单线程的非阻塞的脚本语言。这也就意味着，代码在执行的任何时候只有一个主线程来处理所有的任务。所以弄懂事件循环机制对我们学习 JS 至关重要。