jS-模式之简单的订阅者和发布者模式

运行下面代码

<!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>