vBulletin等脚本如何在没有cron作业的情况下启动常规维护作业？ 例如，vBulletin不会实时更新线程视图计数，并且只会根据其文档每小时更新一次。 但是，他们没有使用cron工作来做到这一点，那么他们是如何做到的呢？
我问，因为我想在我的某个网站上做类似的事情，但不要 知道他们是如何做到这一点的吗？
How do scripts such as vBulletin launch regular maintenance jobs without cron jobs? For example, vBulletin does not update thread view counts in real-time, and only does so hourly according to their documentation. However, they don't use cron jobs to do that, so how do they do it?
I ask because I would like to do something similar on one of my sites, but don't know how they do this magic?
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