Event System

event.js

function EventEmitter () {
  var eventStorage = {}

  this.on = function(event, handler) {
    if(!eventStorage[event]) eventStorage[event] = []
    eventStorage[event].push(handler)
  }

  this.emit = function(event) {
    var events = eventStorage[event]
    for (var i = 0; i < events.length; i++) {
      var handler = events[i]
      var args = Array.prototype.slice.call(arguments, 1)
      handler.apply(this,args)
    }
  }
}

// test
var a = new EventEmitter()

a.on("test",function(a,b,c) {
  console.log("test", a,b,c);
})

a.emit("test", 1,2,3)