August 2017
Intermediate to advanced
500 pages
12h 3m
Japanese
Content preview from PythonとJavaScriptではじめるデータビジュアライゼーション
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73
4
章
Web
開発の基本
本章では、データスクレイピングの対象となる
Web
ページを理解し、
JavaScript
可視化のスケ
ルトンとして提供する構造にするために必要となる
Web
開発の知識を紹介します。すぐにわかる
ように、特に
Web
サイト全体ではなく自己完結型の可視化の構築に重点を置いているときには
（詳細は「
4.2
シングルページアプリケーション」を参照）、ちょっとした知識が最近の
Web
開発
に有効となります。
これまでと同じく、本章もリファレンスとチュートリアルを兼ねています。既にご存知のことも
あるでしょうが、知っていることは遠慮なく飛ばして新しい題材に取りかかってください。
4.1
全体像
ワールドワイドウェブ（
WWW
）の基本構成要素であるシンプルな
Web
ページ（人類が利用
するインターネットのほんの一部）は、さまざまな種類のファイルで構成されています。マル
チメディアファイル（画像、ビデオ、音声など）を別にすると、主な要素はハイパーテキスト
マークアップ言語（
HTML
：
Hypertext Markup Language
）、
CSS
（
Cascading Style Sheets
）、
JavaScript
からなるテキストです。この
3
つと必要なデータファイルはハイパーテキスト転送プロ
トコル（
HTTP
：
Hypertext Transfer Protocol
）で配信し、表示ページを構築してブラウザウィン
ドウでやり取りします。これは、コンテンツを表す階層ツリーである
DOM
（
Document Object ...
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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.