最近开发了一个React18的后台管理系统，登录界面如下：

如果登录成功了则提示并跳转到首页：

点击注销按钮则提示退出系统成功：

没有登录就访问首页则提示请先登录。

这些功能是怎么实现的呢？

先看看登录功能使用FastAPI是怎么开发的。

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from fastapi.middleware.cors import CORSMiddleware

app = FastAPI()
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


class LoginSchema(BaseModel):
    username: str
    password: str


@app.post("/login")
async def login(user: LoginSchema):
    if user.username == "admin" and user.password == "123456":
        return {"token": "xxx"}
    raise HTTPException(400, "用户名或密码错误")


if __name__ == '__main__':
    import uvicorn

    uvicorn.run(app, host='0.0.0.0', port=8888)

再来看看登录功能的前端代码是怎么写的：

import "./login.css"
import {Button, Checkbox, Form, Input, message} from 'antd';
import req from "../utils/request.js"
import {useNavigate} from "react-router-dom";
import storage from "../utils/storage.js";

function Login() {
    const navigate = useNavigate();
    // 点击登录
    const onFinish = (values) => {
        const data = {
            username: values.username,
            password: values.password,
        }
        req.post("/login", data).then(res => {
            message.success("登录成功");
            storage.set("token", res.token)
            navigate("/")
        }).catch(err => {
            console.log("登录失败", err)
        })
    };

    return <div className="login">
        <div className="login-form">
            <Form
                name="basic"
                onFinish={onFinish}
            >
                <Form.Item
                    label="账号"
                    name="username"
                    rules={[
                        {
                            required: true,
                            message: '账号不能为空',
                        },
                    ]}
                >
                    <Input/>
                </Form.Item>

                <Form.Item
                    label="密码"
                    name="password"
                    rules={[
                        {
                            required: true,
                            message: '密码不能为空',
                        },
                    ]}
                >
                    <Input.Password/>
                </Form.Item>

                <Form.Item
                    name="remember"
                    valuePropName="checked"
                    style={{marginLeft: '50px'}}
                >
                    <Checkbox>记住我</Checkbox>
                </Form.Item>

                <Form.Item style={{marginLeft: '50px'}}>
                    <Button type="primary" htmlType="submit">
                        立即登录
                    </Button>
                </Form.Item>
            </Form>
        </div>

    </div>
}

export default Login

首页的代码则相对比较简单：

import {useEffect} from "react";
import req from "../utils/request"
import money from "../utils/money"
import date from "../utils/date"
import {useNavigate} from "react-router-dom";
import storage from "../utils/storage.js";
import {message} from "antd";

function Index() {
    const navigate = useNavigate();
    useEffect(() => {
        if (!storage.get("token")) {
            message.error("请先登录！")
            navigate("/login")
        }
    }, [])

    useEffect(() => {
        req.get("/").then(resp => {
            console.log("xxx", resp)
        }).catch(err => {
            console.log("错误了", err)
        })
    }, [])

    // 用户注销
    const logout = () => {
        storage.delete("token")
        navigate("/login")
        message.success("退出系统成功！")
    }

    return (
        <div className="container">
            <h1>首页</h1>
            <h3>格式化金额：{money.formatYuan(333444555)}</h3>
            <h3>格式化日期：{date.format()}</h3>
            <button onClick={logout}>注销</button>
        </div>
    )
}

export default Index

当然，想要实现完整的功能肯定远不止这些代码，这里录制了完整的视频教程如下。

如果你想要完整的代码，或者完整的视频教程，或者一对一的私教课，欢迎留言或者私信。