参考文档：https://www.cnblogs.com/gamedaybyday/p/6083164.html

完整项目：

对象池类

// 对象池
class objectPool {
    private pool: Object;

    public constructor() {
        this.pool = {};
    }
    /**
     * 获取对象
     * @className 对象类名
     * @args 构造函数传参
     */
    public pop(className: string, ...args: any[]): any {
        if (this.pool[className] == null) {
            this.pool[className] = [];
        }
        var list: Array<any> = this.pool[className];
        if (list.length > 0) {
            return list.pop();
        } else {
            let argsLen: number = args.length;
            var clz: any = egret.getDefinitionByName(className);
            var obj: any;
            switch (argsLen) {
                case 0:
                    obj = new clz();
                    break;
                case 1:
                    obj = new clz(args[0]);
                    break;
                case 2:
                    obj = new clz(args[0],args[1]);
                    break;
                case 3:
                    obj = new clz(args[0],args[1],args[2]);
                    break;
                case 4:
                    obj = new clz(args[0],args[1],args[2],args[3]);
                    break;
                case 5:
                    obj = new clz(args[0],args[1],args[2],args[3],args[4]);
                    break;
            }
            obj.className = className;
        }
        return obj;
    }
    /**
     * 回收对象
    * @obj 需要回收的对象
    */
    public push(obj: any): void {
        var className = obj.className;
        if (this.pool[className] == null) {
            console.log("回收对象的数组不存在");
            return;
        }
        this.pool[className].push(obj);
    }
    /**
     * 创建对象(用于将要大量使用前，预先创建，防止使用时大量创建卡顿)
     * @className 对象类定义
     * @num 创建数量
     * @args 构造函数传参
     */
    public create(className: string, num: number, ...args: any[]) {
        var list = [];
        for (var i = 0; i < num; i++) {
            list.push(this.pop(className, ...args));
        }
        for (i = 0; i < num; i++) {
            this.push(list.pop());
        }
    }
    /**
     * 获取对象池对象数量
     * @className 对象类定义
     * @return 对象数量
     */
    public getLen(className: string): number {
        if (this.pool[className]) {
            return this.pool[className].length;
        }
        return 0;
    }

    /**
     * 清理对象
     * @className 对象类定义
　　  * @funName 清理前执行指定函数
     */
    public clear(className: string, funName: string = null) {
        if (this.pool[className]) {
            funName && this.dealFun(className, funName);
            this.pool[className] = null;
            delete this.pool[className];
        }
    }
    /**
     * 对象池所有对象执行指定函数
     * @className 对象类定义
     * @funName 函数名
     */
    public dealFun(className: string, funName: string) {
        if (this.pool[className]) {
            var list: Array<any> = this.pool[className];
            var len = list.length;
            for (var i = 0; i < len; i++) {
                list[i][funName] && list[i][funName]();
            }
        }
    }
}

调用类

module game {
	export class mainScene extends eui.Component implements eui.UIComponent {
		private closeBtn: eui.Button;
		private player: game.player;
		private pool: objectPool;

		public constructor() {
			super();
		}
		protected partAdded(partName: string, instance: any): void {
			super.partAdded(partName, instance);
		}
		protected childrenCreated(): void {
			super.childrenCreated();
			this.closeBtn.addEventListener(egret.TouchEvent.TOUCH_TAP, this.btnClick, this);
			this.showPlayer();
		}
		private btnClick(): void {
			let gameLogin = new game.gameLogin();
			game.sceneManager.Instance.changeScene(gameLogin);
		}
		private showPlayer(): void {
			this.player = new game.player();
			this.addChild(this.player);
			this.player.x = 100;
			this.player.y = 1000;

			this.pool = new objectPool();
			this.pool.create("game.bullet", 10);

			let timer: egret.Timer = new egret.Timer(1000);
			timer.addEventListener(egret.TimerEvent.TIMER, this.createBullet, this);
			timer.start();

			this.stage.addEventListener(egret.TouchEvent.TOUCH_BEGIN, (evt: egret.TouchEvent) => {
				this.player.x = evt.localX;
				this.player.y = evt.localY;
			}, this);

			this.stage.addEventListener(egret.TouchEvent.TOUCH_MOVE, (evt: egret.TouchEvent) => {
				this.player.x = evt.localX;
				this.player.y = evt.localY;
			}, this);
		}

		private createBullet() {
			let bull: game.bullet = this.pool.pop("game.bullet");
			this.addChild(bull);
			let timer: egret.Timer = new egret.Timer(20);
			timer.addEventListener(egret.TimerEvent.TIMER, function () {
				bull.bullet.y -= 10;
			}, this);
			timer.start();
			bull.bullet.x = this.player.x;
			bull.bullet.y = this.player.y;
			let ter = RES.getRes("bullet_png");
			bull.bullet.source = ter;
			setTimeout(() => {
				timer.stop();
				bull.bullet.source = "";
				this.pool.push(bull);
				this.removeChild(bull);
			}, 3000, this);
			let a = this.pool.getLen("game.bullet");
			console.log("this.pool.len = " + a);
		}
	}
}