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# JavaScript 中的 `self`

`self` 是 JavaScript 中一个有特定含义的关键字,下面解释它的用法和与其他类似概念的区别。

## `self` 是什么?

`self` 是一个指向**全局作用域**的引用:

- **在浏览器主线程中**:`self === window`
- **在 Web Worker 中**:`self` 指向 Worker 的全局作用域(

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