nodejs定时任务——node-schedule

nodejs中的定时任务可以通过setInterval来实现，但是不好控制在具体的时间(比如12：00)执行任务。node-schedule可以很好的定制定时任务。

1. node-schedule介绍

• github: node-schedule (opens new window)
• overview: Node Schedule is for time-based scheduling, not interval-based scheduling.

2. 使用方法

1. 安装

npm install node-schedule

2. cron风格的定时任务

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

• cron风格示例

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

const job = schedule.scheduleJob('42 * * * *', function(){
 console.log('The answer to life, the universe, and everything!');
});

在每小时的42分执行定时任务e.g.(19.42,20.42)

• 指定时间

const schedule = require('node-schedule');
const date = new Date(2012, 11, 21, 5, 30, 0);

const job = schedule.scheduleJob(date, function(){
  console.log('The world is going to end today.');
});