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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5
1.4 データベース
JavaScript
ライブラリは
CDN
（
Content Delivery Network
：コンテンツ配信ネットワーク）経由
で入手できるからです。ローカルマシンにライブラリをインストールするのではなく、ブラウザか
ら
Web
経由で利用可能な最も近いサーバから
JavaScript
を取得します。非常に高速です（コンテ
ンツを自分で提供するより高速になります）。
CDN
を使ってライブラリを含めるには通常の
<script>
を使い、一般的には
HTML
ページの下
端に配置します。例えば、次の呼び出しは
D3
の最新バージョンを追加します。
<script
src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.9.1/d3.min.js"
charset="utf-8">
</script>
1.3.2
ローカルへのライブラリのインストール
例えばオフラインでの開発作業が予想されたりインターネット接続を保証できないなどの理由か
ら、
JavaScript
ライブラリをローカルにインストールする必要がある場合には、かなり簡単な方法
がいくつかあります。
まず、単にライブラリを個別にダウンロードしてローカルサーバの
static
フォルダに入れてお
きます。次に示すのが一般的なフォルダ構造です。サードパーティライブラリは、ルート配下の
static/libs
ディレクトリに置きます。
nobel_viz/
└──
static
├──
css
├──
data
├──
libs ...
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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.