egret创建单例类笔记---随记

class EventManager extends egret.EventDispatcher {

    private constructor() {
        super();
    }

    private static instance: EventManager = null;
    private static getInstance1(): EventManager {
        return EventManager.instance;
    }

    private static getInstance(): EventManager {
        if (!EventManager.instance) {
            EventManager.instance = new EventManager();
            EventManager.getInstance = EventManager.getInstance1;
        }
        return EventManager.instance;
    }
}