async_sleep.js

#!/usr/bin/env node
var async = require('async');

function sleep(time, callback){
    setTimeout(callback, time);
}

async.series([
    function(callback) {
        console.log('###1');
        sleep(1000, function (){ console.log("1 done"); } )
        callback(null, 1);
    },

    function(callback) {
        console.log('###3');
        sleep(3000, function (){ console.log("3 done"); } )
        callback(null, 1);
    },

    function(callback) {
        console.log('###2');
        sleep(2000, function (){ console.log("2 done"); } )
        callback(null, 1);
    },

]);

結果:

$ node async_sleep.js
###1
###3
###2
1 done
2 done
3 done