How to implement scheduled tasks in NodeJs (detailed tutorial)

This article mainly introduces the sample code for implementing scheduled tasks in NodeJs. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor and take a look.

In the project, there is a function that is executed at 0 o’clock every day. I originally wanted to use setInterval to implement it, but I feel that this kind of demand will continue to exist in the future. Writing it yourself may not be scalable. high.

After searching, I found the node-schedule package.

Now record the usage method

node-schedule always executes specific methods by creating a new scheduleJob object.

The time value is expressed in the following table

*  *  *  *  *  *
┬  ┬  ┬  ┬  ┬  ┬
│  │  │  │  │  |
│  │  │  │  │  └ [dayOfWeek]day of week (0 - 7) (0 or 7 is Sun)
│  │  │  │  └───── [month]month (1 - 12)
│  │  │  └────────── [date]day of month (1 - 31)
│  │  └─────────────── [hour]hour (0 - 23)
│  └──────────────────── [minute]minute (0 - 59)
└───────────────────────── [second]second (0 - 59, OPTIONAL)

Use node-schedule to execute the method at the specified time

var schedule = require('node-schedule');
var date = new Date(2017, 11, 16, 16, 43, 0);

var j = schedule.scheduleJob(date, function(){
 console.log('现在时间：',new Date());
});

At 16:00 on December 16, 2017 43 minutes and 0 seconds, print the current time

Specify time interval execution method

var rule = new schedule.RecurrenceRule();
rule.second = 10;
var j = schedule.scheduleJob(rule, function(){
 console.log('现在时间：',new Date());
});

This is to print the time every time the number of seconds is 10. If you want to execute it every 10 seconds, just set rule.second =[0,10,20,30,40,50].

The values ​​supported by rule are second, minute, hour, date, dayOfWeek, month, year

Similarly:

Execution per second is rule.second =[0 ,1,2,3...59]
Execution for 0 seconds every minute is rule.second =0
Execution for 30 minutes every hour is rule.minute =30;rule.second =0;
Execution at 0 o'clock every day is rule.hour =0;rule.minute =0;rule.second =0;
....
At 10 o'clock on the 1st of each month, rule.date =1;rule .hour =10;rule.minute =0;rule.second =0;
0 o'clock and 12 o'clock on 1, 3, and 5 every week are rule.dayOfWeek =[1,3,5];rule.hour = [0,12];rule.minute =0;rule.second =0;
....

Example

1: Determine the time

For example: Execute

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

  var date = new Date(2014,2,14,15,40,0);

  var j = schedule.scheduleJob(date, function(){

　　　　console.log("执行任务");

　 });

Cancel task at 15:40 on February 14, 2014

 j.cancel();

2: Fixed time every hour

For example: every hour 40-minute execution

　　var rule = new schedule.RecurrenceRule();

　　rule.minute = 40;

　　var j = schedule.scheduleJob(rule, function(){

　　　　console.log("执行任务");

　　});

3: Execution at a certain time on certain days of the week,

For example: execution at 20:00 from Monday to Sunday

　　var rule = new schedule.RecurrenceRule();

　　rule.dayOfWeek = [0, new schedule.Range(1, 6)];

　　rule.hour = 20;

　　rule.minute = 0;

　　var j = schedule.scheduleJob(rule, function(){

　　　　console.log("执行任务");

　　});

4 : Execution per second

　　var rule = new schedule.RecurrenceRule();

　　var times = [];

　　for(var i=1; i<60; i++){

　　　　times.push(i);

　　}

　　rule.second = times;

　　var c=0;
　　var j = schedule.scheduleJob(rule, function(){
   　　 c++;
   　　console.log(c);
　　});

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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