backbone 之事件(events)

var User = function(name) {   
    this.name = name;   
}   
User.records = [];   
   
User.bind = function(ev, callback) {   
    var calls = this._callbacks || (this._callbacks = {});   
    (this._callbacks[ev] || (this._callbacks[ev] = [])).push(callback);   
}   
   
User.trigger = function(ev) {   
    var list, calls, i, l;   
    if (!(calls =this._callbacks)) return this;   
    if (!(list = this._callbacks[ev])) return this;   
    $.each(list, function(){this.apply(this())})   
}   
   
User.bind('change', function(){   
    alert('dddd');   
});   
User.create = function(name){   
    this.records.push(new this(name));   
    this.trigger('change');   
}   
   
User.create('liuzhang');

var object = {};   
   
_.extend(object, Backbone.Events);   
   
object.on("alert", function(msg) {   
  alert("Triggered " + msg);   
});   
   
object.trigger("alert", "an event");

_.extend(Model.prototype, Events, {});   
_.extend(Collection.prototype, Events, {})   
_.extend(View.prototype, Events, {});