javascript - 在 ES6 类中使用 EventEmitter

Question

我正在尝试让我自己的类中的 EventEmitter 在 ES6 中运行:

"use strict";
const EventEmitter = require('events');

class Client extends EventEmitter{

    constructor(token, client_id, client_secret, redirect_uri, code){
        super();
        this.token = token;
        this.client_id = client_id;
        this.client_secret = client_secret;
        this.redirect_uri = redirect_uri;
        this.code = code;
    }

    eventTest(){
        this.emit("event");
        console.log(this.token);
    }
}

let testClient = new Client(1,2,3,4,5);

testClient.eventTest();
testClient.on('event', () => {console.log('triggerd!')} );

但事件没有做任何事情^^

如果没有 ES6，我可以使用以下代码:

var util = require('util');
var EventEmitter = require('events').EventEmitter;

var Client = function(credentials) {
    var self = this;

    function eventTest() {
        self.emit('event');
    }
};

util.inherits(Client, EventEmitter);

有人知道如何在 ES6 中正确地做到这一点吗？

Answer 1

事件是同步的——你在听之前触发它。使用

const testClient = new Client(1,2,3,4,5);
testClient.on('event', () => {console.log('triggered!')} );
testClient.eventTest();