1.1 运行环境不只是浏览器：V8、Node.js与嵌入式场景 我见过不少初学者把一个概念记死了：JavaScript只能在浏览器里跑。实际上，JavaScript的核心规范是ECMAScript，它只定义了语法、类型、对象、关键字这些语言本身的东西，至于能不能操作页面、能不能读写文件，全靠宿主环境提供能力。

本内容遵循CC 4.0 BY-SA版权协议 作为前端开发者，每天打交道最多的就是变量声明。但你是否真正理解var、let和const这三者的区别？很多初学者容易混淆它们的行为特性，今天我们就来彻底拆解这三个关键字。 先看一个真实案例：某次代码评审中，我发现同事在for ...

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