本篇文章源自开源面试题库项目 30 Seconds of Interviews 中的经典问题文档 questions/null-vs-undefined.md，系统梳理 JavaScript 中两个"空值"——null 与 undefined——的本质区别、typeof 检查的历史遗留 Bug、相等性比较规则以及它们在布尔语境中的表现。读完本文，你将能够在 ...

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PR] This article contains advertisements. The operator may receive compensation through applications for the services introduced."I'm interested in IT. But I don't know which companies to apply to.""I ...

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