Question

大家好，我是 React 初学者，我尝试执行一个函数来注销，但出现此错误。我认为该错误与 useHistory 函数有关，因为如果我删除它，一切正常。或者无论如何，有人知道如何以编程方式重定向到另一个页面

Error: Invalid hook call. Hooks can only be called inside of the body of a function component

这是我的代码。

import React, { Component } from 'react'
import { Link } from 'react-router-dom'
import token from '../services/token'
import api from '../services/api'
import { useHistory } from 'react-router-dom';

const noLogueado = <React.Fragment>
    <li className="nav-item">
        <Link className="nav-link" to="/login">Login</Link>
    </li>
    <li className="nav-item">
        <Link className="nav-link" to="/register">Registrarse</Link>
    </li>
</React.Fragment>;

const logueado = <li className="nav-item dropdown">
    <a className="nav-link dropdown-toggle" href="#" role="button" id="dropdownPerfil" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
        NAME USUARIO
    </a>

    <div className="dropdown-menu dropdown-menu-right" aria-labelledby="dropdownPerfil">
        <a className="dropdown-item" href="#">Mi Perfil</a>
        <a className="dropdown-item" href="#" onClick={() => Logout()}>Cerrar sesión</a>
    </div>
</li>;

const Logout = () => {
    let history = useHistory();

    api.post("logout", "").then(
        (data) => {
            // token.remove();
            history.push('/login');
        },
        (error) => {
            // token.remove();
            history.push('/login');
        }
    );
}

export class NavBar extends Component {
    
    render() {
        return (
            <nav className="navbar navbar-expand navbar-dark bg-dark">
                <Link className="navbar-brand" to="/">
                    Home</Link>
                <div className="collapse navbar-collapse">
                    <ul className="navbar-nav ml-auto">
                        {
                            token.isValid() ? logueado : noLogueado
                        }
                    </ul>
                </div>
            </nav>
        )
    }
}

export default NavBar

Answer 1

将 Logout 重命名为 useLogout（因为它是自定义钩子）：

const useLogout = () => {
  let history = useHistory();

  return useCallback(() => api.post("logout", "").then(
    (data) => {
      // token.remove();
      history.push('/login');
    },
    (error) => {
      // token.remove();
      history.push('/login');
    }
  ), [history]);
}

将 logueado 转换为函数组件（Logueado），并从 logout 中获取 useLogout 函数。在 onClick 中调用函数。

const Logueado = () => {
  cosnt logout = useLogout()

  return (
    <li className="nav-item dropdown">
        <a className="nav-link dropdown-toggle" href="#" role="button" id="dropdownPerfil" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            NAME USUARIO
        </a>

        <div className="dropdown-menu dropdown-menu-right" aria-labelledby="dropdownPerfil">
            <a className="dropdown-item" href="#">Mi Perfil</a>
            <a className="dropdown-item" href="#" onClick={logout}>Cerrar sesión</a>
        </div>
    </li>;
  )
}

由于 Logueado 现在是一个组件，所以在 NavBar 渲染方法中渲染它：

<ul className="navbar-nav ml-auto">
    {
        token.isValid() ? <Logueado /> : noLogueado
    }
</ul>

错误：无效的钩子调用，反应路由器历史

1 个答案: