Nodejs計時器定時執行函數

一、最low的定時器： 每次執行完間隔5s，然后繼續執行

(function schedule() {
    setTimeout(do_it, 5000, schedule);
}());
function do_it(callback) {
    var times = new Date();
    console.log(times.getSeconds());
    callback();
};

二、逼格高一點使用插件 node-schedule

　　安裝：npm install node-schedule

　　1、確定時間，例如：2012年11月21日，5:30

var schedule = require('node-schedule');
var date = new Date(2012, 11, 21, 5, 30, 0);
var j = schedule.scheduleJob(date, function(){
    console.log('The world is going to end today.');
});


j.cancel();  //取消預設計划

　　2、每小時的固定分鍾，例如：每個小時的42分鍾

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、一個星期中的某些天的某個時刻，例如：每周四，周五，周六，周天的17點

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、每秒執行

　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);
　　});