JS模式之简单的订阅者和发布者模式完整实例

时间：2021-05-26

本文实例讲述了JS模式之简单的订阅者和发布者模式。分享给大家供大家参考。具体如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>parten</title></head><body><script>var singletonTest = SingletonTest.getInstance({ pointX : 5});console.log(singletonTest.pointX);//easy_Observer_model;function ObserverList(){ this.observerList = [];};ObserverList.prototype.Add = function(obj){ return this.observerList.push(obj);};ObserverList.prototype.Empty = function(){ this.observerList = [];};ObserverList.prototype.Count = function(){ return this.observerList.length;};ObserverList.prototype.Get = function(index){ if(index>-1 && index<this.observerList.length) return this.observerList[index];};ObserverList.prototype.Insert = function(obj,index){ var pointer = -1; if(index == 0){ this.observerList.unshift(obj); pointer = index; }else if(index == this.observerList.length){ this.observerList.push(obj); pointer = index; }; return pointer;};ObserverList.prototype.IndexOf = function(obj,startIndex){ var i = startIndex, pointer = -1; while(i < this.observerList.length){ if(this.observerList[i] === obj){ pointer = i; }; i++ }; return pointer;};ObserverList.prototype.RemoveIndexAt = function(index){ if(index === 0){ this.observerList.shift(); }else if(index === this.observerList.length-1){ this.observerList.pop(); }; return index;};function extend(obj,extension){ for(var key in obj){ extension[key] = obj[key]; }};//function Subject(){ this.observers = new ObserverList();};Subject.prototype.AddObserver = function(obj){ this.observers.add(obj)};Subject.prototype.RemoveObserver = function(observer){ this.observers.removeIndexAt( this.observers.IndexOf(observer,0) );};Subject.prototype.Notify = function(context){ var observerCount = this.observers.count(); for(var i=0; i<observerCount; i++){ this.observers.Get(i).update(context); };}//Pubsub//subscribevar Pubsub = {};(function(q){ var topics = [], subUid = -1; q.publish = function(topic,args){ if(!topics[topic]){ return false; }; var subscribers = topics[topic], len = subscribers ? subscribers.length : 0; while(len--){ subscribers[len].func(topic,args); } return this; }; q.subscribe = function(topic,func){ if(!topics[topic]){ topics[topic] = []; }; var token = (++subUid).toString(); topics[topic].push({ token : token, func : func }); return token; }; q.unsubscribe = function(token){ for(var m in topics){ if(topics[m]){ for(var i=0; i<topics[m].length; i++){ if(topics[m][i].token === token){ topics[m].splice(i,1); return token; } } }; }; return this; }})(pubsub);</script></body></html>

希望本文所述对大家的javascript程序设计有所帮助。

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