节点 ES6 class 事件发射器函数？

Question

我正在尝试创建一个 class 所有实例都响应事件的事件：

const events = require("events");
const eventEmitter = new events.EventEmitter();

class Camera {
    constructor(ip) {
        this.ip = ip;     
    }

    eventEmitter.on("recordVideo", recordClip);

    recordClip() {
        console.log("running record video");
    }
}

// emit event once a minute
setInterval(function(){
    eventEmitter.emit('recordVideo');
}, 1000*60);

recordClip 函数似乎从未被调用过。这可能吗？

我也试过运行 this.recordClip 而不是 recordClip。

Answer 1

将它移到构造函数中。

const events = require("events");
const eventEmitter = new events.EventEmitter();

class Camera {
    constructor(ip) {
        this.ip = ip;
        eventEmitter.on("recordVideo", this.recordClip.bind(this));
    }

    recordClip() {
        console.log("running record video");
    }
}

节点 ES6 class 事件发射器函数？

Node ES6 class event emitter function?

javascript

node.js

eventemitter

ecmascript-6

es6-class