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给乒乓球桌加一个pingpongdesk标签，给球加上pingpongball标签，给球网加上wang标签，应该就能用了

world.onPlayerJoin(({entity})=>{
    entity.enableDamage=true;
    entity.pressed=false;
    entity.pressedTime=0;
    entity.player.playingPingPong=true;
    entity.player.dialog({
        type:Box3DialogType.TEXT,
        title:"乒乓球-测试版",
        content:`不需要瞄准球，在球附近朝要打的方向长按左键蓄力，松开发射`
    })
})

function setInter(query, id, rad, interact, func) {
    world.querySelectorAll(query).forEach((e) => {
        e.enableInteract = true;
        e.interactRadius = rad;
        e.interactHint = id;
        e.interactColor.set(1,0.3,0.3)
        e.interactColor.set(1, 1, 1);
        if (interact) {
            e.onInteract(({ entity, targetEntity }) => {
                func(entity, targetEntity);
            })
        }
    })
}
setInter(".pingpongdesk","打乒乓球",30,true,async function(entity,targetEntity){
    entity.player.playingPingPong=true;
    world.querySelectorAll(".pingpongball").forEach((e)=>{
        e.gravity=true;
        e.collides=true;
        e.fixed=false;
    })

})

world.querySelector(".pingpongball").maxHeight=0;
world.querySelector(".pingpongball").friction=0;
world.onPress(({entity,button})=>{
    if(button=='action0'){
    entity.pressed=true;
    entity.pressedTime=world.currentTick;
    entity.player.canFly=true;
    }
})
world.onTick(()=>{
    var s=world.querySelector(".pingpongball");
    if(s.position.y>s.maxHeight)s.maxHeight=s.position.y;
    if(s.position.y<=0){
        world.say("球出界了，重置完毕")
        s.position.set(92.8,23.1,110.5)
        s.velocity.set(0,0,0)
        s.maxHeight=23;
    }
})
world.onRelease(({entity,raycast:{direction},button})=>{
    if(button=='action0'&&entity.player.playingPingPong){
        if(true){
        var force=world.currentTick-entity.pressedTime;
        if(force>10)force=10;
        world.querySelectorAll(".pingpongball").forEach((e)=>{
            if(e.position.distance(entity.position)<20){
                e.say(force);
                var k=4;
                e.velocity.x=direction.x*force/k;
                e.velocity.y+=direction.y*force/k*3;
                e.velocity.z=direction.z*force/k;
            }
        })
        }
    }
})

world.onEntityContact(({entity,other,force})=>{
    if(entity.hasTag("pingpongball")&&other.hasTag("pingpongdesk")){
        entity.velocity.y+=entity.maxHeight/28;
    }else if(entity.hasTag("pingpongball")&&other.hasTag("wang")){
        world.say("球下网了，重置完毕")
        entity.position.set(92.8,23.1,110.5);
        entity.velocity.set(0,0,0)
        entity.maxHeight=23;
    }
})
world.onVoxelContact(({voxel,entity})=>{
    if(entity.hasTag("pingpongball")){
        world.say("球出界了，重置完毕")
        entity.position.set(92.8,23.1,110.5);
        entity.velocity.set(0,0,0)
        entity.maxHeight=23;
    }
})