条件渲染问题：登录/注销按钮在 React 中无法正常工作

Question

我正在开发一个 React 应用程序，我需要根据用户当前的身份验证状态有条件地呈现“登录”或“注销”按钮。但是，我遇到了条件语句未按预期工作的问题。即使用户登录后，也只显示登录按钮，除非同时显示两个按钮，否则我无法注销，这不是所需的行为。

<div className="auth">
                    {
                        isAuthenticated ?
                        (<button onClick={() => loginWithRedirect()}><CiLogin /></button>)
                        :
                        (<button onClick={() => logout({ logoutParams: { returnTo: window.location.origin }          })}><CiLogout /></button>)
                    }
                    
                </div>

import React from 'react'
import { FaTruckMoving } from 'react-icons/fa';
import { AiOutlineHeart, AiOutlineUser } from 'react-icons/ai'
import { BsBagCheck } from 'react-icons/bs'
import { CiLogin, CiLogout } from 'react-icons/ci'
import './Nav.css'
import { Link } from 'react-router-dom';
import { useAuth0 } from "@auth0/auth0-react";

const Nav = () => {
    const { loginWithRedirect, logout, user, isAuthenticated  } = useAuth0();
    let authButton;

  if (isAuthenticated) {
    authButton = (
      <button onClick={() => loginWithRedirect()}><CiLogin /></button>
    );
  } else {
    authButton = (
      <button onClick={() => logout({ logoutParams: { returnTo: window.location.origin } })}><CiLogout /></button>
    );
  }
return (
    <>
        <div className="free">
            <div className='icon'>
                    <FaTruckMoving /> 
            </div>
            <p> 
                Free Shipping for Orders upto Rs.1000 
            </p>
        </div>

        <div className="main_header">
            <div className="container">
                <div className="logo">
                    <img src="./img/logo.svg" alt="Logo" style={{width:'120px'}}/>
                </div>
                <div className="search_box">
                    <input type="text" defaultValue="" placeholder="Enter the Product Name" autoComplete='off' />
                    <button>Search</button>
                </div>
                <div className="icon">
                    {
                        isAuthenticated && 
                        (
                            <div className="account">
                                <div className="user_icon">
                                    <AiOutlineUser />
                                </div>
                                <p>Hello, {user.name}</p>
                            </div>
                        )
                    }
                    <div className="second_icon">
                        <Link to="/" className='link'><AiOutlineHeart /></Link>
                        <Link to="/cart" className='link'><BsBagCheck /></Link>
                    </div>
                </div>
            </div>
        </div>

        <div className="header">
            <div className="container">
                <div className="nav">
                    <ul>
                        <li>
                            <Link to='/' className='link'>Home</Link>
                        </li>
                        <li>
                            <Link to='/product' className='link'>Product</Link>
                        </li>
                        <li>
                            <Link to='/about' className='link'>About</Link>
                        </li>
                        <li>
                            <Link to='/contact' className='link'>Contact</Link>
                        </li>
                    </ul>
                </div>

                <div className="auth">
                    {authButton}
                </div>
            </div>
        </div>
    </>
)
}

export default Nav

我尝试了上述方法，但结果仍然相同

Answer 1

您没有使用 isAuthenticated 的好方法，如果 isAuthenticated 为 True，则需要显示注销按钮，否则如果 isAuthenticated 为 False您需要显示登录按钮。

试试这个：

{ isAuthenticated ?
  (<button onClick={() => logout({ logoutParams: { returnTo: window.location.origin }          })}><CiLogout /></button>)
 :
  (<button onClick={() => loginWithRedirect()}><CiLogin /></button>)
}