setstate 回调后 useState 没有改变？

Question

我只想在错误状态下添加错误信息。但是当错误发生时，setError does not changing 意味着不添加错误信息。后端以 json 格式提供错误消息 { "error": "error message" } 并且如果我控制台记录该错误但工作正常但错误状态未更新。

import { useState, useCallback, useRef, useEffect } from 'react';

export const useHttpClient = () => {
    const [ isLoading, setIsLoading ] = useState(false);
    const [ error, setError ] = useState();

    const activeHttpRequests = useRef([]);

    const sendRequest = useCallback(async (url, method = 'GET', body = null, headers = {}) => {
        setIsLoading(true);
        const httpAbortCtrl = new AbortController();
        activeHttpRequests.current.push(httpAbortCtrl);
         try {
            const response = await fetch(url, {
                method,
                body,
                headers,
                signal: httpAbortCtrl.signal
            });
            const responseData = await response.json();
            activeHttpRequests.current = activeHttpRequests.current.filter(
                reqCtrl => reqCtrl !== httpAbortCtrl
            );

            if(!response.ok) {
                throw new Error(responseData.error);
            }

            setIsLoading(false);
            return responseData;
        } catch (e) {
            setError(e.message);
            setIsLoading(false);
            throw e;
        }
    }, []);

     const clearError = () => {
         setError(null);
     };

    useEffect(() => {
        //this runs as cleanup function before next time useEffect run or also when an component use useEffect unmount
        return () => {
            activeHttpRequests.current.forEach(aboutCtr => aboutCtr.abort());
        }
    }, []);

     return { isLoading, error, sendRequest, clearError };
}

Answer 1

由于您的后端正在响应 JSON，这意味着响应状态代码可能是 200（成功）。这使得“response.ok”为真。

您必须查看返回的 JSON 字符串以获取有效数据或错误消息。

setstate 回调后 useState 没有改变？

useState does not changing after setstate callback?

javascript

fetch

reactjs

react-hooks

react-state