主页 / 网络编程 /

JS模式之简单的订阅者和发布者模式完整实例

网络编程 2021-07-04 21:48www.168986.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://.w3./TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://.w3./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 ics = [],
    subUid = -1;
  q.publish = function(ic,args){
    if(!ics[ic]){
      return false;
    };
    var subscribers = ics[ic],
      len = subscribers ? subscribers.length : 0;
    while(len--){
      subscribers[len].func(ic,args);
    }
    return this;
  };
  q.subscribe = function(ic,func){
    if(!ics[ic]){
      ics[ic] = [];
    };
    var token = (++subUid).toString();
    ics[ic].push({
      token : token,
      func : func
    });
    return token;
  };
  q.unsubscribe = function(token){
    for(var m in ics){
      if(ics[m]){
        for(var i=0; i<ics[m].length; i++){
          if(ics[m][i].token === token){
            ics[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。

上一篇：JS建造者模式基本用法实例分析 下一篇：JS模式之单例模式基本用法

编程语言

Copyright © 2016-2025 www.168986.cn 狼蚁网络 版权所有 Power by