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/* From http://pluralsight.com/blogs/dbox/archive/2007/01/24/45864.aspx */

/*

* Publishers are in charge of "publishing" i.e. creating the event.

* They're also in charge of "notifying" (firing the event).

*/

/**

* 下面的例子发布者处于明显的主导地位

* 它们负责登记其顾客，而且有权停止为其投送

* 最后，新的报纸出版后它们将其投送给顾客

*/

var Publisher = new Observable;

/*

* Subscribers basically... "subscribe" (or listen).

* Once they've been "notified" their callback functions are invoked.

*/

var Subscriber = function(news) {

// news delivered directly to my front porch

};

// 以一个代表订阅者的回调函数为参数，deliver方法在调用过程中将通过这些回调函数把数据发送给每一个订阅者。

Publisher.subscribeCustomer(Subscriber);

/*

* Deliver a paper:

* sends out the news to all subscribers.

*/

Publisher.deliver('extre, extre, read all about it');

/*

* That customer forgot to pay his bill.

*/

Publisher.unSubscribeCustomer(Subscriber);