received this error "Error: Too many re-renders. React limits the number of renders to prevent an infinite loop."

Question

我是 reactjs 的新手，我收到此错误："Error: Too many re-renders. React limits the number of renders to prevent an infinite loop." 我不确定如何解决它。

const MAPBOX_TOKEN = ''; ///add token here

export default function MapHooks(){
    const [mapping, setMapping] = useState({
        width: 800,
        height: 600,
        longitude: -122.45,
        latitude: 37.78,
        zoom: 14
      });

    function _onViewportChange(mapping){
        setMapping({mapping})
    }

    function _goToNYC() {
        const viewport = {
            ...mapping,
            longitude: 101.7412,
            latitude: 3.1549,
            zoom: 14,
            transitionDuration: 5000,
            transitionInterpolator: new FlyToInterpolator(),
            transitionEasing: d3.easeCubic
        };
        setMapping({viewport}) 

    }

    return (
        <div>
            <button onClick={_goToNYC()}>New York City</button>
            <MapGL
            {...mapping}
            mapStyle="mapbox://styles/mapbox/dark-v10"
            onViewportChange={_onViewportChange()}
            mapboxApiAccessToken={MAPBOX_TOKEN}
            ></MapGL>
        </div>
    );
}

请帮忙，谢谢:)

Answer 1

将函数分配给 onClick 时不应该执行该函数，您应该像这样传递它：

<button onClick={_goToNYC}>New York City</button>

如果你在赋值的时候真的调用了它，那么这个函数就会执行。在该执行中，您调用 setMapping(...)，这将触发重新渲染。这将导致该函数在按钮呈现时再次执行，依此类推 -> 无限循环

Answer 2

这是最新的源代码。谢谢:)

const MAPBOX_TOKEN = ''

export default function MapHooks(){
    const [mapping, setMapping] = useState({
        width: 800,
        height: 600,
        longitude: -122.45,
        latitude: 37.78,
        zoom: 14
      });

    function _goToNYC() {
        const viewport = {
            ...mapping,
            longitude: 101.7412,
            latitude: 3.1549,
            zoom: 14,
            transitionDuration: 5000,
            transitionInterpolator: new FlyToInterpolator(),
            transitionEasing: d3.easeCubic
        };
        setMapping(viewport)            
    }

    return (
        <div style={{borderStyle: "solid"}}>
            <button onClick={_goToNYC}>2BF53E</button>
            <button>406C01</button>
            <MapGL
            {...mapping}
            mapStyle="mapbox://styles/mapbox/dark-v10"
            onViewportChange={setMapping}
            mapboxApiAccessToken={MAPBOX_TOKEN}
            ></MapGL>
        </div>
    );
}

received this error "Error: Too many re-renders. React limits the number of renders to prevent an infinite loop."

received this error "Error: Too many re-renders. React limits the number of renders to prevent an infinite loop."

reactjs

react-hooks

react-map-gl