javascript - Node ES6类事件发射器函数？

Question

我正在尝试创建一个所有实例都响应事件的类:

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。这可能吗？

我还尝试运行 this.recordClip 而不是 recordClip。

Answer 1

将其移至构造函数内。

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");
    }
}