export default function Height() {const [showDom,setShowDom]=useState([])const heightRef = useRef(null)let arrData =[{"index": 1,//占的U位"model_id": "assert",//model_id"ci_id": 1,//设备id "ci_name": "设备1"//设备名称},{"index": 2,"model_id": "assert","ci_id": 1,//设备占的U位多id相同"ci_name": ""//设备占的U位多不写名称},{"index": 3,"model_id": "assert","ci_id": 1,"ci_name": ""},{"index": 4,"model_id": "assert","ci_id": 2,"ci_name": "设备2"},{"index": 5,"model_id": "assert","ci_id": 2,"ci_name": ""},{"index": 6,"model_id": "assert","ci_id": 2,"ci_name": ""},{"index": 7,//没有占用 序号要有"model_id": "","ci_id": "",//没有U位id为空"ci_name": ""}]const changeData=(arrData)=>{let newArr = []arrData.forEach(item => {const parent = newArr.find(c => c.ci_id=== item.ci_id)if (parent) {parent.dataInfo.push(item)} else {const obj = {index: item.index,model_id:item.model_id,ci_id: item.ci_id,ci_name:item.ci_name,dataInfo:[item]}newArr.push(obj)}})newArr.map(obj => {  obj.height = obj.dataInfo.length*20+"px";  return obj;  });  return newArr}useEffect(()=>{let arrObj= changeData(arrData);//  console.log(heightRef.style)console.log(arrObj)setShowDom(arrObj)},[])return (<div>{showDom.map(item=>{return <div key={item.index} className="box1" style={{ height:item.height }} ref={heightRef}>{item.ci_name}</div>})}</div>)
}