aaac7fed
 liuqimichale
add
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'use strict';
var inherits = require('inherits')
, EventTarget = require('./eventtarget')
;
function EventEmitter() {
EventTarget.call(this);
}
inherits(EventEmitter, EventTarget);
EventEmitter.prototype.removeAllListeners = function(type) {
if (type) {
delete this._listeners[type];
} else {
this._listeners = {};
}
};
EventEmitter.prototype.once = function(type, listener) {
var self = this
, fired = false;
function g() {
self.removeListener(type, g);
if (!fired) {
fired = true;
listener.apply(this, arguments);
}
}
this.on(type, g);
};
EventEmitter.prototype.emit = function() {
var type = arguments[0];
var listeners = this._listeners[type];
if (!listeners) {
return;
}
// equivalent of Array.prototype.slice.call(arguments, 1);
var l = arguments.length;
var args = new Array(l - 1);
for (var ai = 1; ai < l; ai++) {
args[ai - 1] = arguments[ai];
}
for (var i = 0; i < listeners.length; i++) {
listeners[i].apply(this, args);
}
};
EventEmitter.prototype.on = EventEmitter.prototype.addListener = EventTarget.prototype.addEventListener;
EventEmitter.prototype.removeListener = EventTarget.prototype.removeEventListener;
module.exports.EventEmitter = EventEmitter;
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