July 2017
Beginner to intermediate
256 pages
2h 50m
Japanese
Content preview from アイソモーフィックJavaScript
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1章アイソモーフィックJavaScriptが求められる理由
Jason Strimpel, Maxime Najim
2010年に、Twitterは刷新されたWebサイトを公開しました。これは#NewTwitterと呼ばれ、UIの描画やロジックがユーザーのブラウザ上のJavaScriptへと移されていました。当時としては画期的なアーキテクチャーでした。しかしその2年後に、Twitterはサイトを再び設計し直して描画処理をサーバー側に戻しました。その結果、ページの初期読み込み時間を以前の5分の1にできました（http://bit.ly/twitterwebspeed）。このサーバー側への揺り戻しは、JavaScriptコミュニティーに衝撃を与えました。開発者もそうでない人々も、クライアント側での描画がもたらすパフォーマンスへの大きな影響をすぐに悟りました。
![[注記]](/api/v2/epubs/urn:orm:book:9784873118079/files/images/note.png) |
クライアント側のWebアプリケーションでの最大の弱みは、最初に大きなJavaScriptファイルをダウンロードしなければならないという点です。インターネットでの通信にはTCP（Transmission Control Protocol）という方式が一般的に採用されており、ここでは混雑を避けるためにスロースタートというしくみが取り入れられています。初めは少量ずつデータが送られ、徐々に増えてゆきます。『ハイパフォーマンス ブラウザネットワーキング』（オライリー・ジャパン）でIlya Grigorikは、「クライアントとサーバー間のスループットが64キロバイトに到達するまでには、4往復の通信と数百ミリ秒の遅延が必要」と述べています。よいユーザーエクスペリエンスとページの応答性にとって、最初の数キロバイトのデータはきわめて重要です。 ... |
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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.