5
// get state
const { inscriptions } = useSelector( state => state.user );

// flag
const instances = Object.keys(inscriptions).length;

// dispatch
const dispatch = useDispatch();

const getInscriptions = () => dispatch( getInscriptionsAction() );

useEffect( () => {
    // call api only if empty
    if(instances === 0) {
        const queryToAPI = async () => {
            getInscriptions();
        }
        
        queryToAPI();
    }
    
    // eslint-disable-next-line react-hooks/exhaustive-deps
}, [ instances, inscriptions ]);

我的问题是,每当我在 de useEffect 中调用强制存储更新的 API 时,这会使组件重新渲染,从而启动无限循环。我不能if(isntances === 0) return null;在 useEffect 下放置类似的东西,因为我的铭文数组可以是空的,我尝试添加各种标志,但它保持无限循环。有任何想法吗?

==================编辑=============================== = 好的,现在我已经实现了一些建议,但问题仍然存在,无限循环仍然存在。

// get state
const { inscriptions } = useSelector( state => state.user );

// flag
const instances = Object.keys(inscriptions).length;

// dispatch
const dispatch = useDispatch();

// const getInscriptions = () => dispatch( getInscriptionsAction() );

const getInscriptions = useCallback(
    () => dispatch( getInscriptionsAction() ),
    [ dispatch, getInscriptionsAction ]
);

useEffect( () => {
    // call api only if empty
    if(instances === 0) {
        // const queryToAPI = async () => {
            getInscriptions();
        // }
        
        // queryToAPI();
    }
    
    // eslint-disable-next-line react-hooks/exhaustive-deps
}, [ ]);
4

1 回答 1

1

好的,我想通了,我在 Reducer 中的一种类型将铭文放置在空数组中,因此它正在无限地重新渲染。

于 2020-06-26T20:05:44.610 回答