#文章 浏览器限制setTimeout是为了防止滥用，避免网站过度消耗用户电量或阻塞交互，例如将延迟时间限制为至少4毫秒。尽管如此，浏览器仍引入了新的定时器技术，如setImmediate、Promises和scheduler.postTask。

https://nolanlawson.com/2025/08/31/why-do-browsers-throttle-javascript-timers/
Read the Tea Leaves
Why do browsers throttle JavaScript timers?
Even if you’ve been doing JavaScript for a while, you might be surprised to learn that setTimeout(0) is not really setTimeout(0). Instead, it could run 4 milliseconds later: Nearly a decade a…
 
 
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