constexpress = require('express');

constapp = express();

constPORT = process.env.PORT || 3000;

app.use(express.json());

app.use(express.urlencoded({ extended: true }));

app.get('/', (req, res) => {

res.send('Hello World!');

});

app.get('/api/users', (req, res) => {

res.json({ users: [] });

});

app.listen(PORT, () => {

console.log(`服务器运行在端口 ${PORT}`);

});

module.exports = app;