如何在React.js中使用Fetch API将数据投递到数据库

fetch('http://your-backend-url', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ data: yourData }),
})
  .then(response => response.json())
  .then(data => {
    // 处理响应数据
  })
  .catch(error => {
    // 处理错误
  });

const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const mongoose = require('mongoose');

// 连接到MongoDB数据库
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true });

// 定义数据模型
const DataSchema = new mongoose.Schema({
  data: String,
});

const DataModel = mongoose.model('Data', DataSchema);

// 解析请求体
app.use(bodyParser.json());

// 处理POST请求
app.post('/', (req, res) => {
  const newData = new DataModel({ data: req.body.data });
  newData.save()
    .then(() => {
      res.send('Data saved successfully');
    })
    .catch(error => {
      res.status(500).send('Error saving data');
    });
});

// 启动服务器
app.listen(3000, () => {
  console.log('Server is running on port 3000');
});