jes-utils/lib/Event.js

js通用函数工具封装

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (global = global || self, factory(global.Event = {}));
}(this, (function (exports) { 'use strict';

  /** Event */

  /**
   * EventHub 发布者订阅事件器
   * @function EventHub
   * @param { null } - 无返回参数
   * @returns { Object } - 广播/订阅
   */
  var EventHub = function EventHub() {
    return {
      hub: Object.create(null),
      emit: function emit(event, data) {
        (this.hub[event] || []).forEach(function (handler) {
          return handler(data);
        });
      },
      on: function on(event, handler) {
        if (!this.hub[event]) this.hub[event] = [];
        this.hub[event].push(handler);
      },
      off: function off(event, handler) {
        var i = (this.hub[event] || []).findIndex(function (h) {
          return h === handler;
        });
        if (i > -1) this.hub[event].splice(i, 1);
        if (this.hub[event].length === 0) delete this.hub[event];
      }
    };
  };

  exports.EventHub = EventHub;

  Object.defineProperty(exports, '__esModule', { value: true });

})));