JS模式之简单的订阅者和发布者模式完整实例
编程学习 2021-07-04 21:48www.dzhlxh.cn编程入门
这篇文章主要介绍了JS模式之简单的订阅者和发布者模式,以一个完整实例形式详细分析了JS订阅者和发布者模式基本实现技巧,需要的朋友可以参考下
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//subscribe
var 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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