observer pattern for js

c1312.Observable.js

var c1312 = c1312 || {};

c1312.Observable = function() {
    this._observers = [];
}

c1312.Observable.prototype = {
  addObserver: function(o) {
    this._observers.push(o);
  },
  deleteObserver: function(o) {
   for(var i = 0; i < this._observers.length; i++ ) {
      if(this._observers[i] == o)
          this._observers.splice(i,1);
    }
  },
  notifyObservers: function(msg) {
    for(var i = 0; i < this._observers.length; i++ ) {
      this._observers[i](msg);
    }
  }
}