javaScript设计模式（一）观察者模式

哈哈。。写了一个钟，一点一点加功能。
 1 function Publisher(){
 2     this.subscribers = []; //存储订阅者
 3     this.news = [];  //存储要发布的消息
 4 }
 5 //使用“推”方式：由publisher推消息给Subscribers
 6 
 7 
 8 Publisher.prototype = {
 9     deliver : function(data){ 
10         var that = this;
11         this.subscribers.forEach(function(){
12             that.news.forEach(function(fnElement){
13                 fnElement(data);
14             });
15         });
16         return this;
17     },
18     addNew : function(fn){
19         this.news.push(fn);
20         return this;
21     }
22 
23 };
24 function Subscriber(){
25 //使用"推",订阅者没必要保存发布者。只要发布者保存订阅者就可以了
26 //    this.publishers = [];  
27 }
28 Subscriber.prototype = {
29     subscribe : function(publisher){
30         publisher.subscribers.push(this);
31 //        this.publishers.push(publisher);
32         return this;
33     },
34     unsubscribe : function(publisher){
35         var that = this;
36         publisher.subscribers = publisher.subscribers.filter(function(element){
37             return element !== that;
38         });
39 
40 /*        this.publishers = this.publishers.filter(function(element){
41             return element !== publisher;
42         });
43 */
44         return this;
45     }
46 };
47 
48 //example
49 var f1 = function (data) {
50     console.log(data + ', 赶紧干活了！');
51 };
52 
53 var f2 = function (data) {
54     console.log(data + ',不然没饭吃！');
55 };
56 
57 var publ = new Publisher();
58 publ.addNew(f1).addNew(f2);
59 
60 
61 var subc01 = new Subscriber();
62 subc01.subscribe(publ);
63 
64 var subc02 = new Subscriber();
65 subc02.subscribe(publ);
66 
67 subc02.unsubscribe(publ);
68 
69 publ.deliver('你们');