carrot/assets/Script/Game/GameFrameWork/MonsterMgr.ts

import { _decorator, Component, instantiate, Node, Prefab } from 'cc';
const { ccclass, property } = _decorator;

@ccclass('MonsterMgr')
export class MonsterMgr extends Component {
    @property(Prefab)
    monsterPre: Prefab = null;
    start() {
        this.schedule(()=>{
            const monster = instantiate(this.monsterPre);
            monster.parent = this.node;
        }, 2)
    }

    update(deltaTime: number) {
        
    }
}