Question

我不明白为什么这个错误不是每次都出现，有时代码工作有时不工作

const dispatch = useDispatch()

const userDetails = useSelector(state => state.userDetails)
const { error, loading, user } = userDetails

const userLogin = useSelector(state => state.userLogin)
const { userInfo } = userLogin

const userUpdateProfile = useSelector(state => state.userUpdateProfile)
const { success } = userUpdateProfile


useEffect(() => {
        if (!userInfo) {
            **history.push**(`/login`)
        }
        else{
            if(!user || !user.name || success){
                dispatch({ type: USER_UPDATE_DETAILS_RESET })
                dispatch(getUserDetails('profile'))
            }
            else{
                setName(user.name)
                setEmail(user.email) 
            }
        }
    }, [dispatch, history, userInfo, user, success ])

Answer 1

在顶部添加 const history = useHistory();。之后，您可以检查其值是否未定义。

Answer 2

import { useHistory } from "react-router-dom";

const history = useHistory();

history.push(/login)

TypeError: history.push is not a function 为什么这有时会显示

2 个答案: