js前台调用后台方法数据库

// 使用Fetch API发送GET请求
fetch('https://example.com/api/data', {
    method: 'GET',
    headers: {
        'Content-Type': 'application/json'
    }
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

// 使用Fetch API发送POST请求
fetch('https://example.com/api/data', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({ key1: 'value1', key2: 'value2' })
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

const express = require('express');
const app = express();
const port = 3000;

app.use(express.json());

app.get('/api/data', (req, res) => {
    // 这里可以连接数据库并获取数据
    res.json({ message: 'Hello from server!' });
});

app.post('/api/data', (req, res) => {
    const data = req.body;
    // 处理数据并可能存入数据库
    res.json({ received: data });
});

app.listen(port, () => {
    console.log(`Server running at http://localhost:${port}/`);
});

const cors = require('cors');
app.use(cors());

fetch('https://example.com/api/data', {
    method: 'GET',
    headers: {
        'Content-Type': 'application/json'
    },
    timeout: 10000 // 10秒超时
})