March 2017
Intermediate to advanced
248 pages
3h 10m
Japanese
Content preview from Reactビギナーズガイド ―コンポーネントベースのフロントエンド開発入門
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4章JSX
ここまでのコードでは、render()関数の中で定義されるユーザーインタフェースはReact.createElement()やReact.DOM.*のメソッド群（React.DOM.span()など）を使って定義されていました。メソッド呼び出しの構造が複雑になり、閉じカッコを正しく記述するのが面倒という問題がありました。そこで、よりシンプルな記法としてJSXが用意されています。
JSXはReactとは独立したしくみのため、使わなくてもまったく問題ありません。実際に、3章までのコードではJSXを使っていません。JSXを一切使わないということも可能です。ただし、一度便利さを知るとメソッド呼び出しの世界には戻りにくくなるでしょう。
![[注記]](/api/v2/epubs/urn:orm:book:9784873117881/files/images/note.png) |
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JSXが何の略かは定かではありませんが、JavaScriptXMLまたはJavaScript Syntax eXtensionの略だとされることがよくあります。JSXはオープンソースプロジェクトで、ホームページはhttp://facebook.github.io/jsx/にあります。 |
4.1 ハロー、JSX
1章で取り上げたHello worldの例を思い出してみましょう。
<script src="react/build/react.js"></script> <script src="react/build/react-dom.js"></script> <script> ReactDOM.render( React.DOM.h1( {id: ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.