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function Pubsub() { | |
this.events = {}; | |
} | |
Pubsub.prototype.publish = function(event, args) { | |
if (!this.events[event]) { | |
return false; | |
} | |
var subscribers = this.events[event]; | |
var len = subscribers ? subscribers.length : 0; | |
while (len--) { | |
subscribers[len](); | |
} | |
return this; | |
} | |
Pubsub.prototype.subscribe = function(event, func) { | |
if (!this.events[event]) { | |
this.events[event] = []; | |
} | |
this.events[event].push(func); | |
} | |
Pubsub.prototype.unsubscribe = function(event, func) { | |
var self = this; | |
if (this.events[event]) { | |
this.events[event].forEach(function(el, index){ | |
if (el == func) { | |
self.events.splice(index, 1); | |
} | |
}) | |
} | |
} | |
var pubsub = new Pubsub(); | |
var eat = function() { | |
console.log("I am eating"); | |
} | |
var drink = function() { | |
console.log("I am drinking"); | |
} | |
var running = function() { | |
console.log("I am running"); | |
} | |
pubsub.subscribe("dinner", eat); | |
pubsub.subscribe("dinner", drink); | |
pubsub.subscribe("sports", running); | |
pubsub.publish("dinner"); | |
// should log | |
// I am drinking | |
// I am eating | |
pubsub.publish("sports") | |
// should log | |
// I am running |
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