team1_nc/assets/script/game/component/tween/MoveUpAndDown.ts

const { ccclass, property } = cc._decorator;


@ccclass
export default class MoveUpAndDown extends cc.Component {

    @property({ displayName: '移动的相对距离' })
    private moveOffset: cc.Vec3 = cc.Vec3.ZERO;
    @property({ displayName: '移动时间' })
    private duration: number = 0;

    private startPos: cc.Vec3 = cc.Vec3.ZERO;
    start() {

        this.node.getPosition(this.startPos);

        let pos = cc.Vec3.ZERO;
        this.startPos.add(this.moveOffset, pos);

        cc.tween(this.node).to(this.duration, { position: pos }).to(this.duration, { position: cc.v3(this.startPos) }, cc.easeSineOut())
            .union().repeatForever().start();

    }
}