Sample code for implementing scheduled tasks in NodeJs

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 need will continue to exist in the future. Writing it yourself may not be very scalable. I discovered the node-schedule package, so in this article we will share with you the sample code for implementing scheduled tasks in NodeJs.

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 16:43:00 on December 16, 2017, print the time at that 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 whenever 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:

Every Execution in seconds is rule.second =[0,1,2,3...59]
Execution in 0 seconds per minute is rule.second =0
Execution in 30 minutes per hour is rule.minute = 30;rule.second =0;
The execution at 0 o'clock every day is rule.hour =0;rule.minute =0;rule.second =0;
....
10 on the 1st of every month The points are 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"); 　 });

at 15:40 on February 14, 2014 to cancel the task

j.cancel();

2: Fixed time every hour

For example: 40 minutes execution every hour

　　var rule = new schedule.RecurrenceRule(); 　　rule.minute = 40; 　　var j = schedule.scheduleJob(rule, function(){ 　　　　console.log("执行任务"); 　　});

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

For example: executed 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: Executed every 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 content is the sample code for NodeJs to implement scheduled tasks. I hope it can help.

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