How to automatically run a scheduled task every hour in Node.js All In One

如何在 Node.js 中每间隔一小时自动运行一个定时任务

引用场景

Node.js 后台爬虫服务，定时爬去指定页面，抓取最新数据，并写入到数据库中；

在同一个 Node.js 部署环境中，没有使用 Linux 的 crontab 权限，只能作为 express.js server 的一个子模块使用，故需要自动定时执行任务

GitHub schedule
crontab schedule

solutions

node-schedule

$ npm i node-schedule

https://www.npmjs.com/package/node-schedule

var schedule = require('node-schedule');

var task = schedule.scheduleJob('0 */8 * * *', function () {
    console.log('Scheduled Task, every 8 hours');
});

var cron = require('node-schedule');

var rule = new cron.RecurrenceRule();
rule.hour = 8;
rule.minute = 0;

cron.scheduleJob(rule, function(){
    console.log(new Date(), 'Every 8 hours');
});

https://github.com/node-schedule/node-schedule

node-cron

$ npm i -S node-cron

https://www.npmjs.com/package/node-cron

var cron = require('node-cron');

cron.schedule('* * * * *', () => {
  console.log('running a task every minute');
});

var cron = require('node-cron');

 cron.schedule('0 8 * * *', () => {
   console.log('Running a job at 08:00 at Asia/Shanghai timezone');
 }, {
   scheduled: true,
   timezone: "Asia/Shanghai"
 });

https://github.com/node-cron/node-cron