发布订阅

 能撸代码就别BB，直接上代码:

var pubsub = {};

(function(p) {
    var topics = {},
        subUid = -1;
    //发布
    p.publish = function(topic, msg) {
        if (!topics[topic]) {
            return false;
        }

        var i = 0,
            subscribers = topics[topic],
            len = subscribers.length;
        for (; i < len; i++) {
            subscribers[i].func(msg);
        }

        return this;
    };

    //订阅
    p.subscribe = function(topic, func) {
        if (!topics[topic]) {
            topics[topic] = [];
        }

        var token = (++subUid).toSring();

        topics[topic].push({
            token: token,
            func: func
        });

        return token;
    };

    //取消订阅
    p.unsubscribe = function(token) {
        var m, i, len;

        for (m in topics) {
            if (topics[m]) {
                for (i = 0, len = topics[m].length; i < len; i++) {
                    if (topics[m][i].token === token) {
                        topics[m][i].splice(i, 1);
                        return token;
                    }
                }
            }
        }

        return false;
    };
})(pubsub);