February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
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174
6 章 Express で開発をスピードアップ
解説
app.get
を使用して、
/page
への固定ルートを設定し、このルートへのアクセスがあった場合
のサーバの処理を
app.get
のコールバックに記述します。今回は、
res.send
（
http
モジュールの
res.write
を拡張したメソッド）を使ってシンプルなテキストを出力しています。
Express
は固定ルート設定の他にも、プレースホルダを使ったフレキシブルな
URL
ルーティン
グ機能を持っています。プレースホルダの例として、コードに
:page
プレースホルダを記述して
ルーティングを行っています（
:
はプレースホルダを表し、その後に続く文字列はプレースホルダ
の名前です）。
リクエスト
URL
がプレースホルダの形にマッチすると、プレースホルダにあたる文字列が
req.
params
のパラメータとして格納されます。その際のパラメータ名は
:
を除いたプレースホルダの
名前（
page
）です。本コードの場合は、例えば
/NodeCookbook
にアクセスがあると、
req.params.
page
に
NodeCookbook
という文字列が格納されます。
ブラウザで
http://localhost:3000/page
にアクセスすると「こんにちは。
Mr. Page
です。」
と表示され、
http://localhost:3000/NodeCookbook
にアクセスすると「こんにちは。
Mr.
NodeCookbook
です。」と表示されます。
関連するレシピ
●
「レシピ
1.1
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.