话不多说上代码，记录一下初学cocos解决的问题，实用小功能。 

import { _decorator, Button, Component, Node, ProgressBarComponent, Sprite, UITransform, Vec3 } from 'cc';
const { ccclass, property } = _decorator;

@ccclass('game_scene1')
export class game_scene1 extends Component {
    @property({ type: Button })
    back: Button = null;    //返回按钮
    @property({ type: Sprite })
    loading: Sprite = null;    //进度条
    @property({ type: Node })
    pen: Node = null;  //毛笔移动

    onLoad() {
        this.back.node.on(Button.EventType.CLICK, this.backMain, this);

    }

    start() {
        
    }

    update(deltaTime: number) {
        this.LoadingMove(deltaTime);
        this.PenMove();
    }
    

    backMain() {
        //返回主页面
        console.log("返回主页");
        //this.LoadingMove(0.1);  //刷新进度条
    }
    //进度条填充
    LoadingMove(filltime: number) {
        this.loading.fillRange += filltime;
    }

    //笔的位置更新
    PenMove() {
        // 获取进度条的宽度
        let size = this.loading.getComponent(UITransform).contentSize;

        // 计算物体的目标位置
        const targetX = size.width * this.loading.fillRange;
        //targetX是你要跟随的图片节点的位置偏移量
        const targetPosition = new Vec3(targetX-190, this.pen.position.y, this.pen.position.z);

        // 更新物体的位置
        this.pen.setPosition(targetPosition);
    }

}

图片效果：毛笔一直随着进度条进行位移