app从云服务器数据库获取数据

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

app.get('/data', (req, res) => {
  // 假设从数据库获取数据
  const data = { message: 'Hello from server!' };
  res.json(data);
});

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

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        guard let url = URL(string: "http://localhost:3000/data") else { return }
        
        let task = URLSession.shared.dataTask(with: url) { data, response, error in
            if let error = error {
                print("Error: \(error)")
                return
            }
            
            guard let data = data else { return }
            
            do {
                let json = try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
                print("Data: \(json ?? [:])")
            } catch {
                print("JSON parsing error: \(error)")
            }
        }
        
        task.resume()
    }
}