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我正在编写一个用于车辆跟踪的应用程序。在 Google Maps API 的帮助下，我可以获取路线并提取所有需要的信息。Elevations API 响应出现了问题。从 DirectionRender 类中，我将路径和距离作为道具发送。GM Elevations 请求是通过 lift.getElevationAlongPath(option,PlotElevation) 完成的。PlotElevation (elevations,status) 是一个回调函数。但是，无论我如何尝试仅从它那里接收一个响应（使用 useMemo、useEffect，我想我都尝试了所有方法），仍然存在重新呈现响应的问题。OVER_QUERY_LIMIT 或无休止的重新渲染。有人可以帮忙吗？谢谢

const Elevation = React.memo(props =>{

const [path, setPath] = useState({...props.path})
const [distance, setDistance]=useState({...props.distance})  
const [elevationArray, setElevationArray] = useState(null)
const [stop, setStop] = useState(false)

let pathElev = JSON.parse(JSON.stringify(path))

React.useEffect(() => {
    setPath(props.path)
}, [props.path])
React.useEffect(() => {
    setDistance(props.distance)
}, [props.distance])


let elevator = new window.google.maps.ElevationService;
let numberSamples = parseInt( distance/40)

let options = {
    'path':path,
    'samples':numberSamples 
}

//The problem starts here
const  PlotElevation  = (elevations, status) => {
    if (stop === false){
        console.log('status',status)             
        console.log(JSON.parse(JSON.stringify(elevations)))
        setElevationArray(elevations)  
        //setStop(true)
        console.log(elevations[19].elevation)    
        return         
    }
} 
const Memo = React.useMemo(
    ()=>{
    elevator.getElevationAlongPath(
        options,PlotElevation                
        )
},[elevator.getElevationAlongPath(
    options,PlotElevation                
    )])

// elevator.getElevationAlongPath(
//     {
//       path: path,
//       samples: 100
//     },  elevations =>{      
//       setElevationArray({            
//         // We’ll probably want to massage the data shape later:
//        // elevationArray: elevations
//       })
//     }
//   ) 
return (
    <div>
        {Memo}
        {console.log('path is received ', pathElev)}
        {console.log('number of samples', numberSamples)}    
        {console.log('elevation check ',elevationArray)}
                              
        {/* {elevator.getElevationAlongPath(
        options,PlotElevation)} */}
           
         
    </div>
)

})

导出默认高程

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