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- 'use strict';
- function EventTarget() {
- this._listeners = {};
- }
- EventTarget.prototype.addEventListener = function(eventType, listener) {
- if (!(eventType in this._listeners)) {
- this._listeners[eventType] = [];
- }
- var arr = this._listeners[eventType];
-
- if (arr.indexOf(listener) === -1) {
-
- arr = arr.concat([listener]);
- }
- this._listeners[eventType] = arr;
- };
- EventTarget.prototype.removeEventListener = function(eventType, listener) {
- var arr = this._listeners[eventType];
- if (!arr) {
- return;
- }
- var idx = arr.indexOf(listener);
- if (idx !== -1) {
- if (arr.length > 1) {
-
- this._listeners[eventType] = arr.slice(0, idx).concat(arr.slice(idx + 1));
- } else {
- delete this._listeners[eventType];
- }
- return;
- }
- };
- EventTarget.prototype.dispatchEvent = function() {
- var event = arguments[0];
- var t = event.type;
-
- var args = arguments.length === 1 ? [event] : Array.apply(null, arguments);
-
-
-
-
- if (this['on' + t]) {
- this['on' + t].apply(this, args);
- }
- if (t in this._listeners) {
-
- var listeners = this._listeners[t];
- for (var i = 0; i < listeners.length; i++) {
- listeners[i].apply(this, args);
- }
- }
- };
- module.exports = EventTarget;
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