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Copy path2 - Newspapers and subscribers.js
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Copy path2 - Newspapers and subscribers.js
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65 lines (59 loc) · 1.76 KB
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/*
* Newspaper Vendors
* setup as new Publisher objects
*/
/**
* 这个例子中拥有订阅和退订权的一方变成了订阅者，负责发送数据的还是发布者一方。
*/
var NewYorkTimes = new Publisher;
var AustinHerald = new Publisher;
var SfChronicle = new Publisher;
/*
* People who like to read
* (Subscribers)
*
* Each subscriber is set up as a callback method.
* They all inherit from the Function prototype Object.
*/
var Joe = function(from) {
console.log('Delivery from '+from+' to Joe');
};
var Lindsay = function(from) {
console.log('Delivery from '+from+' to Lindsay');
};
var Quadaras = function(from) {
console.log('Delivery from '+from+' to Quadaras ');
};
/*
* Here we allow them to subscribe to newspapers
* which are the Publisher objects.
* In this case Joe subscribes to the NY Times and
* the Chronicle. Lindsay subscribes to NY Times
* Austin Herald and Chronicle. And the Quadaras
* respectfully subscribe to the Herald and the Chronicle
*/
// 订阅者拥有subscribe和unsubscribe方法。订阅者只是普通的回调函数，那两个方法是通过扩展Function的prototype而加入的。
Joe.
subscribe(NewYorkTimes).
subscribe(SfChronicle);
Lindsay.
subscribe(AustinHerald).
subscribe(SfChronicle).
subscribe(NewYorkTimes);
Quadaras.
subscribe(AustinHerald).
subscribe(SfChronicle);
/*
* Then at any given time in our application, our publishers can send
* off data for the subscribers to consume and react to.
*/
// 发布者拥有deliver方法
NewYorkTimes.
deliver('Here is your paper! Direct from the Big apple');
AustinHerald.
deliver('News').
deliver('Reviews').
deliver('Coupons');
SfChronicle.
deliver('The weather is still chilly').
deliver('Hi Mom! I\'m writing a book');