TypeScript之自定义事件

class MyEvent extends CustomEvent {     public static readonly CMD: string = "EVENT_NAME";    public constructor($type: string , $data: T ) {         super( $type , { detail: $data, bubbles: true, cancelable: true, composed: true });    }}class MyDispatch extends EventTarget {     private static _instance: MyDispatch;    public static get Instance(): MyDispatch {         if (!MyDispatch._instance) MyDispatch._instance = new MyDispatch();        return MyDispatch._instance;    }    public send($data: T, $type: string = MyEvent.CMD): void {         const $event: CustomEvent = new MyEvent($type, $data);        this.dispatchEvent($event);    }}class Test {     public constructor() {         MyDispatch.Instance.addEventListener(MyEvent.CMD, this.onEvent as EventListener);    }    private onEvent($e: MyEvent): void {         console.log(`target  ${$e.target}`);        console.log(`name: ${$e.detail._name} , occupation: ${$e.detail._occupation}`);    }}interface ITest {     _name: string;    _occupation: string;}let $test: Test = new Test();MyDispatch.Instance.send({ _name: `Aonaufly`, _occupation: `it` });