February 2014
Intermediate to advanced
372 pages
7h
Japanese
Content preview from Backbone.jsアプリケーション開発ガイド
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8.1
RequireJS
と
AMD
によるモジュール管理
183
JavaScript
のコードをすべて読み込んでしまうのではなく、必要なときに必要なコードだけを動
的に読み込むという優れたアプローチが取り入れられています。こうすることによって、初期状態
で読み込まれるコードが減少し、初回読み込みの時間を短縮できます。
ここで例として
Gmail
の
Web
クライアントを取り上げます。ページの初回読み込み時には、
チャットモジュールなどのウィジェットは非表示です。ユーザーがメニューを開くなどの意思表示
をして初めて、依存先のモジュールが動的に読み込まれます。こうすることによって、すべての
ユーザーに対してページの初期化時にチャットモジュールの読み込みを強制せずに済むようになり
ます。その結果として、アプリケーションの読み込み時間やパフォーマンスを向上させることがで
きます。これは大規模なアプリケーションで特に効果的です。
スクリプトローダーを使って読み込みを行わなかったとしても、アプリケーションの中で
RequireJS
のようなツールを利用すると多くのメリットを得られます。
8.1.3
AMD
（
Asynchronous Module Definition
）
AMD
（
https://github.com/amdjs/amdjs-api/wiki/AMD
）はモジュール形式のコードを作成した
り依存関係を管理したりするための手法を定義しており、この仕様を実装したのが
RequireJS
で
す。
RequireJS
の
Web
サイトには、 ...
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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.