eventdispatcher.js:自定义对象的 JavaScript 事件

eventdispatcher.js 自定义对象的 JavaScript 事件 用法 import { EventDispatcher } from 'EventDispatcher.js' ; // Adding events to custom object class Car extends EventDispatcher { start ( ) { this . dispatchEvent ( { type : 'start' , message : 'vroom vroom!' } ) ; } } // Using events const car = new Car ( ) ; car . addEventListener ( 'start' , function ( event ) { alert ( event . message ) ; } ) ; car .