使用node.js模块 node-schedule做定时任务

1.安装

命令： npm install node-schedule

2.使用

node-schedule做定时任务有两种方式可以选择

2.1 Date-based Scheduling 方式

　　1、确定时间，例如：2017年11月21日，5:30

var schedule = require('node-schedule');
var date = new Date(2017, 11, 21, 5, 30, 0);
var j = schedule.scheduleJob(date, function(){
    console.log('The world is going to end today.');
});
j.cancel();  //取消预设计划

　　2、每小时的固定分钟，例如：每个小时的42分钟

var schedule = require('node-schedule');
var rule = new schedule.RecurrenceRule();
rule.minute = 42; 
var j = schedule.scheduleJob(rule, function(){
    console.log('The answer to life, the universe, and everything!');
});

　　3、一个星期中的某些天的某个时刻，例如：每周四，周五，周六，周天的17点

var rule = new schedule.RecurrenceRule();
rule.dayOfWeek = [0, new schedule.Range(4, 6)];
rule.hour = 17;
rule.minute = 0;
var j = schedule.scheduleJob(rule, function(){
    console.log('Today is recognized by Rebecca Black!');
});

　　4、每秒执行

　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);
　　});

2.2 Cron-style Scheduling 方式

时间格式如下图：6个星号

1、每小时的第42分钟执行

var schedule = require('node-schedule');
 //时间格式为 ‘42 * * * *’  或者 ‘0 42 * * * *’，
var j = schedule.scheduleJob('42 * * * *', function(){
  console.log('The answer to life, the universe, and everything!');
});

2、每周五的12:42:00执行

var schedule = require('node-schedule');
 //时间格式为 ‘42 * * * 5’  或者 ‘0 42 * * * 5’，
var j = schedule.scheduleJob('42 * * * 5', function(){
  console.log('The answer to life, the universe, and everything!');
});