我的导航栏上有一个名为 Login 的导航链接(我使用了引导导航栏)。成功登录后,我想用 react-redux(不是 redux-toolkit)的用户名替换登录。请帮助我编写减速器和动作代码。由于我是 redux 的初学者,而且我不知道如何在 reducer 和 action 文件中编码,这让我很困惑。
导航栏组件 (Navbar.js)
import React from 'react';
import { Link } from 'react-router-dom';
import { useSelector } from 'react-redux';
const Navbar = () => {
const {username} = useSelector((state) => state.user);
return (
<div>
<nav className="navbar navbar-expand-lg">
<div className="container-fluid">
<Link className="navbar-brand" to="/hommepage">Ebuy</Link>
<button className="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria- expanded="false" aria-label="Toggle navigation">
<span className="navbar-toggler-icon">
<i className="fas fa-bars" style={{color: 'white', fontSize: '28px'}}></i>
</span>
</button>
<div className="collapse navbar-collapse" id="navbarSupportedContent">
<ul className="navbar-nav me-auto mb-2 mb-lg-0">
<li className="nav-item">
<Link className="nav-link" aria-current="page" to="/homepage">Home</Link>
</li>
<li className="nav-item dropdown">
<Link className="nav-link dropdown-toggle" to="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
Select Category
</Link>
<ul className="dropdown-menu" aria-labelledby="navbarDropdown">
<li><Link className="dropdown-item" to="/skincare">Skincare Products</Link></li>
<li><Link className="dropdown-item" to="/stationary">Stationary Products</Link></li>
<li><Link className="dropdown-item" to="#">Clothing</Link></li>
</ul>
</li>
</ul>
<div className="d-flex">
<ul className="navbar-nav me-auto mb-2 mb-lg-0">
<li className='nav-item'>
<Link className="nav-link" to="/">Login</Link>
</li>
</ul>
</div>
</div>
</div>
</nav>
</div>
);
};
export default Navbar;