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world.onPress(({ button, entity, raycast }) => {
    if (button === 'action0') {

        const a = world.createEntity({

            mesh: 'mesh/boom.vb',
            position: raycast.hitPosition.add(new Box3Vector3(0,1,0)),
            meshScale: new Box3Vector3(3, 3, 3),
            collides: true,
            fixed: true,
            gravity: false,
            meshInvisible: false
            


        })
        
        world.say(raycast.hitPosition);
        for (var i = 0; i < 5; i++) {
            a.meshScale += i / 10;
        };
        world.sound("audio/boom.mp3")
    }
})

如题，求解