expressjs.com/zh-tw/starter/basic-routing.md

layout, title, description, menu, order, redirect_from

layout	title	description	menu	order	redirect_from
page	Express 基本路由	Learn the fundamentals of routing in Express.js applications, including how to define routes, handle HTTP methods, and create route handlers for your web server.	starter	4

基本路由

Routing refers to determining how an application responds to a client request to a particular endpoint, which is a URI (or path) and a specific HTTP request method (GET, POST, and so on).

Each route can have one or more handler functions, which are executed when the route is matched.

路由定義的結構如下：

app.METHOD(PATH, HANDLER)

Where:

• app 是 express 的實例。
• METHOD is an HTTP request method, in lowercase.
• PATH 是伺服器上的路徑。
• HANDLER 是當路由相符時要執行的函數。

This tutorial assumes that an instance of `express` named `app` is created and the server is running. 這項指導教學假設已建立名稱為 `app` 的 `express` 實例，且伺服器正在執行。如果您不熟悉如何建立和啟動應用程式，請參閱 [Hello world 範例](/{{ page.lang }}/starter/hello-world.html)。

下列範例說明如何定義簡單的路由。

首頁中以 Hello World! 回應。

app.get('/', (req, res) => {
  res.send('Hello World!')
})

Respond to a POST request on the root route (/), the application's home page:

app.post('/', (req, res) => {
  res.send('Got a POST request')
})

對 /user 路由發出 PUT 要求時的回應：

app.put('/user', (req, res) => {
  res.send('Got a PUT request at /user')
})

對 /user 路由發出 DELETE 要求時的回應：

app.delete('/user', (req, res) => {
  res.send('Got a DELETE request at /user')
})

如需路由的詳細資料，請參閱[路由手冊](/{{ page.lang }}/guide/routing.html)。