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.
Related recommendations:
About the analysis of the principle of timer in JavaScript
Sharing of php scheduled task framework
How to implement scheduled execution of scheduled tasks in php?
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