const app = require('./app'); require('dotenv').config(); // 从.env读取端口,若没配置则用3000默认值 const PORT = process.env.PORT || 3000; // 启动服务,监听指定端口 app.listen(PORT, () => { console.log(`后端服务已启动!地址:http://localhost:${PORT}`); console.log(`登录接口地址:http://localhost:${PORT}/api/login`); });