Created
November 18, 2013 21:27
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Let's make a new EventEmitter
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| var EventEmitter = function() { | |
| this._events = {}; | |
| }; | |
| EventEmitter.prototype.on = function(evtn, fn) { | |
| if(!this._events.hasOwnProperty(evtn)) this._events[evtn] = []; | |
| this._events[evtn].push(fn); | |
| }; | |
| EventEmitter.prototype.off = function(evtn, fn) { | |
| if(!this._events.hasOwnProperty(evtn)) return; | |
| var idx = this._events[evtn].indexOf(fn); | |
| if(idx < 0) return; | |
| this._events.splice(idx, 1); | |
| }; | |
| EventEmitter.prototype.emit = function(evtn) { | |
| if(!this._events.hasOwnProperty(evtn)) return; | |
| var fns = this._events[evtn].slice(0); | |
| if(fns.length < 1) return; | |
| var args = Array.prototype.slice.call(arguments, 1); | |
| for(var i = 0; i < fns.length; i++) fns[i].apply(this, args); | |
| }; |
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