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);
    
        // let move1= cc.moveBy(this.duration, cc.v2(this.moveOffset.x, this.moveOffset.y));
        // let move2 = cc.moveBy(this.duration, cc.v2(-this.moveOffset.x, -this.moveOffset.y));
        // let seq= cc.sequence([move1, move2]);
        // this.node.runAction(cc.repeatForever(seq));
        
        cc.tween(this.node).by(this.duration, { y: this.moveOffset.y }).by(this.duration, { y: -this.moveOffset.y }).union().repeatForever().start();

    }
}