Function useFiveFloor

Returns [
    shownFloor: Ref<number, number>,
    totalFloorLength: Ref<number, number>,
    showFloor: (floorIndex?: number) => void,
]

[ shownFloor: Five 当前显示的楼层， null 为都显示, showFloor: 设置显示楼层，不传参数为都显示 ]

const [ shownFloor, showFloor ] = useFiveHelper;
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