完整程式碼，請洽: https://github.com/Zrn-code/Node-js-tutorial/tree/node-08

# 什麼是 Middleware

app.js

	app.use((req,res)=>{
	console.log('new request made:');
	console.log('host: ', req.hostname);
	console.log('host: ', req.path);
	console.log('host: ', req.method);
	});

# 使用 `next()` 函式

app.js

	app.use((req,res,next)=>{
	console.log('new request made:');
	console.log('host: ', req.hostname);
	console.log('host: ', req.path);
	console.log('host: ', req.method);
	next();
	});
	app.use((req,res,next)=>{
	console.log('in the next middleware.');
	next();
	});

終端機

npm install morgan

app.js

	const morgan = require('morgan');
	app.use(morgan('dev'));

app.use(express.static('public'));

head.ejs

	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width-device-width, intital-scale-1.0">
	<title>Blogs \|<%= title %></title>
	<link rel="stylesheet" href="/style.css">
	</head>