我想將大量自定義頻道邏輯放入它自己的類中。在我的created生命周期方法中，我正在調用我創建的類中的每個方法，但是我如何保留socket我在 init() 方法中創建的實例以供其他方法使用？主視圖import CustomClass from './CustomClass';created() {    const customClass = new CustomClass();    customClass.init();    customClass.subscribe();}自定義類.jsimport Socket from 'Socket';class CustomClass {    init() {        const socket = new Socket(key: XXXXX);    }    subscribe() {       // how to have access to `socket` here that was created in init?        socket.subscribe(channel: 'xxxx');    }}