February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
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169
レシピ 6.2 環境の定義と設定
実行時に
routes/index.js
の
exports.index
が呼び出されます。
app.js
app.get('/', routes.index);
routes.index
は、基本的に
http.createServer
のコールバックと同じ構造ですが、
app.get
の
最初のパラメータに渡されたルートに対してのみ実行されます。また、リクエスト（
req
）とレス
ポンス（
res
）パラメータは
Express
によって拡張されています。これらの拡張されたパラメータ
については後のレシピで解説します。
routes.index
は
res.render
メソッドを呼び出しています。
title
プロパティで文字列を渡し
て、
views/index.jade
から読み込んだテンプレートをもとにページを生成して返します。
レシピ
6.2
環境の定義と設定
開発コードと本番コードでは、異なる設定が求められます。例えば、開発中はクライアントに対
してデバッグ用の詳細なエラーメッセージを返したいが、本番環境では公開するエラーメッセージ
の情報を最小限に抑えたい場合などが考えられます。
Express
では
app.configure
を使って、そのようなケースに対処することができます。複数の実
行環境を設定し、それぞれの環境に異なった設定を行うことができます。
準備
レシピ
6.1
で作成したプロジェクト（
cookbookapp
ディレクトリとその中身）を用意します。
手順
Express
が作成した
app.js
の中身を見てみましょう。 ...
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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.