Nodejs计时器定时执行函数

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

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();  //取消预设计划

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!‘);
});

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!‘);
});

　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);
　　});