from flask import Flask, request, jsonify

app = Flask(__name__)

users = []

@app.route('/register', methods=['POST'])

def register():

data = request.get_json()

username = data['username']

password = data['password']

if not any(user['username'] == username for user in users):

users.append({'username': username, 'password': password})

return jsonify({"message": "User registered successfully!"}), 201

else:

return jsonify({"message": "Username already exists."}), 409

if __name__ == '__main__':

app.run(debug=True)

]]>

import React, { useState, useEffect } from 'react';

統(tǒng)一消息管理平臺(tái)

const UserList = () => {

const [users, setUsers] = useState([]);

useEffect(() => {

fetch('http://localhost:5000/users')

.then(response => response.json())

.then(data => setUsers(data));

}, []);

return (

{users.map(user => (