如何在特定时间运行功能日期？

本文介绍了如何在特定时间运行功能日期？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

如何在给定的时间和日期运行函数？

How can I run a function at a given time and date?

示例：我有一个函数需要在每月的12号上午10点运行。

Example: I have a function that needs to run on the 12th of each month at 10AM.

如果这很重要，此页面将以24/7运行。

This page will be running 24/7, if this is important.

很明显，我必须与当前日期进行比较，但是我不确定如何检查当前日期和时间是否匹配。

Obviously I'd have to compare against the current date, but I'm not sure how to check if the current date and time has been matched.

香农

推荐答案

不建议使用 setInterval ，因为它具有不确定的行为-可能会错过事件或引发事件一次全部。时间也会变得不同步。

It's not advised to use setInterval because it has non-deterministic behaviour - events can be missed, or fire all at once. Time will fall out of sync, too.

下面的代码改为使用 setTimeout 加上一分钟时间段，其中计时器每分钟重新同步一次，以使其尽可能接近hh：mm：00.000s点。

The code below instead uses setTimeout with a one minute period, where each minute the timer is resynchronised so as to fall as closely to the hh:mm:00.000s point as possible.

function surprise(cb) { (function loop() { var now = new Date(); if (now.getDate() === 12 && now.getHours() === 12 && now.getMinutes() === 0) { cb(); } now = new Date(); // allow for time passing var delay = 60000 - (now % 60000); // exact ms to next minute interval setTimeout(loop, delay); })(); }