Morgan Logger + Express.js：写入文件并在控制台中显示

使用Morgan Logger和Express.js可以方便地将日志信息写入文件并在控制台中显示。这为开发人员提供了一种简单但强大的方式来记录和追踪应用程序的行为。在本文中，我们将介绍如何使用这两个工具，并提供一个案例代码来说明其用法。

npm install morgan express

javascript
const express = require('express');
const morgan = require('morgan');
const app = express();

javascript
const fs = require('fs');
const path = require('path');
const accessLogStream = fs.createWriteStream(path.join(__dirname, 'access.log'), { flags: 'a' });
app.use(morgan('combined', { stream: accessLogStream }));
app.use(morgan('combined'));

javascript
app.get('/', (req, res) => {
  res.send('Hello World!');
});
app.listen(3000, () => {
  console.log('App listening on port 3000');
});

javascript
const express = require('express');
const morgan = require('morgan');
const fs = require('fs');
const path = require('path');
const app = express();
const accessLogStream = fs.createWriteStream(path.join(__dirname, 'access.log'), { flags: 'a' });
app.use(morgan('combined', { stream: accessLogStream }));
app.use(morgan('combined'));
app.get('/', (req, res) => {
  res.send('Hello World!');
});
app.listen(3000, () => {
  console.log('App listening on port 3000');
});