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JS订阅者和发布者模式的实例代码分享

2015-07-22 20:05:03 来源:www.45fan.com 【

JS订阅者和发布者模式的实例代码分享

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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Tags: 模式 简单 订阅
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