纯小白从前端跨域发起axios get请求获取数据

如果有兴趣欢迎往下看：

//nodejs部分

const express = require('express')
const app = express()
const mysql = require('mysql2')
// 创建一个数据库连接
const connection = mysql.createConnection({
    host: 'localhost',
    user: 'root',
    database: 'users',
    password: '203827'
});
connection.connect((err) => {
    if (err) {
        console.error('Error connecting to the database:', err.message);
        return;
    }
    console.log('Connected to the MySQL database.');
});
app.get('/user', (req, res) => {
    const query = 'SELECT * FROM inf';
    connection.query(query, (err, results) => {
        if (err) {
            console.error('Error fetching posts:', err);
            return res.status(500).json({ message: 'Error fetching posts' });
        }
        res.json(results);
    });
    // res.send('test')
})
app.listen('8000', () => {
    console.log('8000启动')
})
//关闭数据库
// connection.end((err) => {
//     if (err) {
//         console.error('Error closing the connection:', err.message);
//         return;
//     }
//     console.log('Database connection closed.');
// });

//前端部分 

import './App.css'
import axios from 'axios'
function App() {
const test=()=>{
axios({
  method:'get',
  url:'api/user/'
}).then(res=>{
  console.log(res)
})
}
  return (
    <>
    <button onClick={test}>测试</button>
    </>
  )
}

export default App