How can we run the node-cron job in every 12 hours interval?

问题

I want to schedule the email after every 12 hrs , For that I have used node-cron.

I have used the following code but its not giving me actual result, so please help me to resolve this issue,

var job = new CronJob('0 0 */12 * * *', function(){
   //email send code ..
});

回答1:

Looking at the documentation the code should look like this:

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

cron.schedule('0 0 */12 * * *', function(){
  console.log('running a task every twelve hours');
});

Note: You need to have the app running all the time or the cron won't be executed.

And If you print the crone time on console the we wil get like as follows :

      cronTime: {
        source: '0 0 */12 * * *',
        zone: 'America/Los_Angeles',
        second: {
          '0': true
        },
        minute: {
          '0': true
        },
        hour: {
          '0': true,
          '12': true
        },
        dayOfMonth: {
          '1': true,
          '2': true,
          '3': true,
          '4': true,
          '5': true,
          '6': true,
          '7': true,
          '8': true,
          '9': true,
          '10': true,
          '11': true,
          '12': true,
          '13': true,
          '14': true,
          '15': true,
          '16': true,
          '17': true,
          '18': true,
          '19': true,
          '20': true,
          '21': true,
          '22': true,
          '23': true,
          '24': true,
          '25': true,
          '26': true,
          '27': true,
          '28': true,
          '29': true,
          '30': true,
          '31': true
        },
        month: {
          '0': true,
          '1': true,
          '2': true,
          '3': true,
          '4': true,
          '5': true,
          '6': true,
          '7': true,
          '8': true,
          '9': true,
          '10': true,
          '11': true
        },
        dayOfWeek: {
          '0': true,
          '1': true,
          '2': true,
          '3': true,
          '4': true,
          '5': true,
          '6': true
        }
      },

回答2:

You can try this module https://www.npmjs.com/package/node-schedule

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


var rule = new schedule.RecurrenceRule();


var j = schedule.scheduleJob('1 * * * * *', function(){
  console.log('Will run after every mint');
});



var rule = new schedule.RecurrenceRule();

rule.second=1;

var j = schedule.scheduleJob(rule, function(){
  console.log('this will run after every one seocnd ');
});

回答3:

Try this for 12 hours interval ...

var job = new CronJob('0 0 12 * * *', function(){

  //email send code ..
});

0 --> for seconds 0 --> for minutes

12--> for 12 hours interval

来源：https://stackoverflow.com/questions/40973124/how-can-we-run-the-node-cron-job-in-every-12-hours-interval

标签

node.js

cron

node-cron