本内容遵循CC 4.0 BY-SA版权协议 我把 JS 这条学习线从头到尾走了一遍：从变量怎么存、作用域怎么找，到函数与闭包怎么让变量“活”起来，最后到异步机制如何处理延迟和并发。这篇文章不是教科书式的概念罗列，更像是我自己踩坑之后整理的一份实操笔记。

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