TypeScript 01——单例模式

• 1、最简单单例写法

onLoad () {
        //写法1
         if(GameMgr.instance == null){
             GameMgr.instance = this;
         }
         else{
             this.destroy();
            return;
        }
    }

调用方式：
GameMgr.instance.方法名();

• 2、懒汉式写法

private static _instance: GameMgr = new GameMgr();
    public static getInstance() {
        if(!this._instance){
            console.log("new GameMgr");
            this._instance = new GameMgr();
        }
        return this._instance;
    }
onLoad () {
        GameMgr._instance = this;
    }

调用方式：
GameMgr.instance.方法名();

• 3、单独基类脚本方式

const {ccclass, property} = cc._decorator;

//Singleton.ts
@ccclass
export class Singleton<T>extends cc.Component{
    private static instance: any = null;
    public static GetInstance<T>(c: { new(): T }): T
    {
        if (this.instance == null)
        {
            this.instance = new c();
        }
        return this.instance;
    }

    onLoad () {
        console.log("11");
        Singleton.instance = this;
    }
}

onLoad () {
        super.onLoad();
    }

继承于cc.Component，可挂载在场景中的物体。
调用方式：
GameMgr.GetInstance(GameMgr).方法名();