自定义事件模型，无需在JavaScript中使用DOM事件

您可以简单地创建一个新的EventTarget实例，就像有些人建议的那样，而不必创建一个DOM对象，像这样:

const target = new EventTarget();
target.addEventListener('customEvent', console.log);
target.dispatchEvent(new Event('customEvent'));

这提供了您习惯使用DOM事件的所有功能，并且不需要创建空文档元素或节点。

查看Mozilla开发者指南获取更多信息:https://developer.mozilla.org/en-US/docs/Web/API/EventTarget

这里有一点Necroposting，但是我昨晚刚刚写了一些像这样的东西-超级简单，并且基于Backbone.js事件模块:

EventDispatcher = {
    events: {},
    on: function(event, callback) {
        var handlers = this.events[event] || [];
        handlers.push(callback);
        this.events[event] = handlers;
    },
    trigger: function(event, data) {
        var handlers = this.events[event];
        if (!handlers || handlers.length < 1)
            return;
        [].forEach.call(handlers, function(handler){
            handler(data);
        });
    }
};

这种方法非常简单且可扩展，如果需要，可以在此基础上构建更复杂的事件系统。

使用EventDispatcher非常简单:

function initializeListeners() {
    EventDispatcher.on('fire', fire); // fire.bind(this) -- if necessary
}
function fire(x) {
    console.log(x);
}
function thingHappened(thing) {
    EventDispatcher.trigger('fire', thing);
}

使用一些简单的命名空间，您将能够轻松地在模块之间传递基本事件!

可以使用JQuery。

订阅自定义事件:

$(computer.keyboard).on('keyEscape', function(e){
    //Handler code
});

抛出自定义事件:

$(computer.keyboard).trigger('keyEscape', {keyCode:'Blah blah'});

可能不是最好的方法，但你也可以在你的方法(addEventListener, dispatchEvent，…)中创建函数来包装JQuery逻辑，以支持原生api和JQuery。

最可能的情况是，您需要一个事件机制作为多个对象之间的通信媒介。

你可以这样做:

/**
 * EventfulObject constructor/base.
 * @type EventfulObject_L7.EventfulObjectConstructor|Function
 */
var EventfulObject = function() {
  /**
   * Map from event name to a list of subscribers.
   * @type Object
   */
  var event = {};
  /**
   * List of all instances of the EventfulObject type.
   * @type Array
   */
  var instances = [];
  /**
   * @returns {EventfulObject_L1.EventfulObjectConstructor} An `EventfulObject`.
   */
  var EventfulObjectConstructor = function() {
    instances.push(this);
  };
  EventfulObjectConstructor.prototype = {
    /**
     * Broadcasts an event of the given name.
     * All instances that wish to receive a broadcast must implement the `receiveBroadcast` method, the event that is being broadcast will be passed to the implementation.
     * @param {String} name Event name.
     * @returns {undefined}
     */
    broadcast: function(name) {
      instances.forEach(function(instance) {
        (instance.hasOwnProperty("receiveBroadcast") && typeof instance["receiveBroadcast"] === "function") &&
        instance["receiveBroadcast"](name);
      });
    },
    /**
     * Emits an event of the given name only to instances that are subscribed to it.
     * @param {String} name Event name.
     * @returns {undefined}
     */
    emit: function(name) {
      event.hasOwnProperty(name) && event[name].forEach(function(subscription) {
        subscription.process.call(subscription.context);
      });
    },
    /**
     * Registers the given action as a listener to the named event.
     * This method will first create an event identified by the given name if one does not exist already.
     * @param {String} name Event name.
     * @param {Function} action Listener.
     * @returns {Function} A deregistration function for this listener.
     */
    on: function(name, action) {
      event.hasOwnProperty(name) || (event[name] = []);
      event[name].push({
        context: this,
        process: action
      });
      var subscriptionIndex = event[name].length - 1;
      return function() {
        event[name].splice(subscriptionIndex, 1);
      };
    }
  };
  return EventfulObjectConstructor;
}();
var Model = function(id) {
  EventfulObject.call(this);
  this.id = id;
  this.receiveBroadcast = function(name) {
    console.log("I smell another " + name + "; and I'm model " + this.id);
  };
};
Model.prototype = Object.create(EventfulObject.prototype);
Model.prototype.constructor = Model;
// ---------- TEST AND USAGE (hopefully it's clear enough...)
// ---------- note: I'm not testing event deregistration.
var ob1 = new EventfulObject();
ob1.on("crap", function() {
  console.log("Speaking about craps on a broadcast? - Count me out!");
});
var model1 = new Model(1);
var model2 = new Model(2);
model2.on("bust", function() {
  console.log("I'm model2 and I'm busting!");
});
var ob2 = new EventfulObject();
ob2.on("bust", function() {
  console.log("I'm ob2 - busted!!!");
});
ob2.receiveBroadcast = function() {
  console.log("If it zips, I'll catch it. - That's me ob2.");
};
console.log("start:BROADCAST'n---------------");
model1.broadcast("crap");
console.log("end  :BROADCAST'n---------------'n-'n-'n");
console.log("start:EMIT'n---------------");
ob1.emit("bust");
console.log("end:EMIT'n---------------");

<h1>...THE SHOW IS ON YOUR CONSOLE!</h1>

自从我在近10年后遇到这个问题以来，浏览器/javascript世界已经发生了很大的变化。

对于那些使用Javascript模块导入/导出的人，这里有我的两点建议:

// eventbus.js
class EventBus {
    constructor() {
        this.events = {};
    }
    on(type, callback) {
        if (!this.events[type]) {
            this.events[type] = [];
        }
        this.events[type].push(callback);
    }
    off(type, callback) {
        if (!this.events[type]) {
            return;
        }
        this.events[type] = this.events[type].filter(listener => listener !== callback);
    }
    dispatch(type, data) {
        if (!this.events[type]) {
            return;
        }
        this.events[type].forEach(listener => listener(data));
    }
}
export const eventbus = new EventBus();

// somefile.js
import {eventbus} from './eventbus';
// Somewhere in a method/click callback/etc..
eventbus.dispatch('fire', {message: 'Fire in the hole!'});

// otherfile.js
import {eventbus} from './eventbus';
eventbus.on('fire', data => {
    console.log(data.message); // logs 'Fire in the hole!'
});

下面是Mohsen的回答的简单扩展，作为一个清晰而简短的例子。

他的所有React函数都被封装到一个React()中，添加了一个removeEventListener()函数，整个示例以一个HTML文件的形式呈现(或在JSFiddle上查看)。

<!DOCTYPE html>
<html>
<head>
    <meta charset=utf-8 />
    <title>JS Bin</title>
    <!--https://jsfiddle.net/romleon/qs26o3p8/-->
</head>
<body>
    <script>
        function Reactor() {
            function Event(name) {
                this.name = name;
                this.callbacks = [];
            }
            Event.prototype.registerCallback = function(callback) {
                this.callbacks.push(callback);
            };
            Event.prototype.unregisterCallback = function(callback) {
                var array = this.callbacks,
                    index = array.indexOf(callback);
                if (index > -1)
                    array.splice(index, 1);
            }
            this.events = {};
            this.registerEvent = function(eventName) {
                var event = new Event(eventName);
                this.events[eventName] = event;
            };
            this.dispatchEvent = function(eventName, eventArgs) {
                var events = this.events
                if (events[eventName]) {
                    events[eventName].callbacks.forEach(function(callback) {
                        callback(eventArgs);
                    });
                }
                else
                    console.error("WARNING: can't dispatch " + '"' + eventName + '"')
            };
            this.addEventListener = function(eventName, callback) {
                this.events[eventName].registerCallback(callback);
            };
            this.removeEventListener = function(eventName, callback) {
                var events = this.events
                if (events[eventName]) {
                    events[eventName].unregisterCallback(callback);
                    delete events[eventName];
                }
                else
                    console.error("ERROR: can't delete " + '"' + eventName + '"')
            };
        }
/*
    demo of creating
*/
        var reactor = new Reactor();
        reactor.registerEvent('big bang');
        reactor.registerEvent('second bang');
/*
    demo of using
*/
        log("-- add 2 event's listeners for 'big bang' and 1 for 'second bang'")
        var callback1 = function() {
            log('This is big bang listener')
        }
        reactor.addEventListener('big bang', callback1);
        reactor.addEventListener('big bang', function() {
            log('This is another big bang listener')
        });
        reactor.addEventListener('second bang', function() {
            log('This is second bang!')
        });
        log("-- dipatch 'big bang' and 'second bang'")
        reactor.dispatchEvent('big bang');
        reactor.dispatchEvent('second bang');
        log("-- remove first listener (with callback1)")
        reactor.removeEventListener('big bang', callback1);
        log("-- dipatch 'big bang' and 'second bang' again")
        reactor.dispatchEvent('big bang');
        reactor.dispatchEvent('second bang');
        function log(txt) {
            document.body.innerHTML += txt + '<br/>'
            console.log(txt)
        }
    </script>
</body>
</html>