play.js

var http = require('http');
var asynclist = require('asynclist');

var opts = {
  host: '127.0.0.1'
};
var list = [];
var succeed = 0;
var failed = 0;
for (var i = 0; i < 1001; i++) {
  list.push(function () {
    http.get(opts, function (res) {
      res.on('end', function () {
        succeed++;
        tasks.trigger(true);
      });
    }).on('error', function (e) {
        console.log('error!');
        failed++;
        tasks.trigger(false);
    });
  });
}
var timeout = 0;
var timer = setInterval(function () {
  timeout++;
}, 1);
var tasks = new asynclist(list);
tasks.assign(function () {
  clearInterval(timer);
  console.log('Finished. Used time: ' + timeout + 'ms');
}).run();