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Copy file name to clipboardExpand all lines: content/docs/getting-started.md
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This page is an overview of the React documentation and related resources.
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このページは React のドキュメント、および関連する資料の概要となります。
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**React**is a JavaScript library for building user interfaces. Learn what React is all about on [our homepage](/) or [in the tutorial](/tutorial/tutorial.html).
React has been designed from the start for gradual adoption, and **you can use as little or as much React as you need.**Whether you want to get a taste of React, add some interactivity to a simple HTML page, or start a complex React-powered app, the links in this section will help you get started.
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React は初めから既存のプロジェクトに徐々に追加していけるようなデザインとなっています。 **あなたは React をどれだけ使っても問題ありません。**触りだけやってみるもよし、シンプルな HTML のページにインタラクティブな機能を追加するのに使うもよし、React をフル活用した複雑なアプリを作成するもよし。どのような目的にしても、このページにあるリンクが役に立つでしょう。
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### Online Playgrounds {#online-playgrounds}
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### Web 上で試せるオンラインエディタ {#online-playgrounds}
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If you're interested in playing around with React, you can use an online code playground. Try a Hello World template on [CodePen](codepen://hello-world)or[CodeSandbox](https://codesandbox.io/s/new).
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React をちょっと試してみたい場合、Web 上のコードエディタが使えます。[CodePen](codepen://hello-world)や[CodeSandbox](https://codesandbox.io/s/new) で Hello World のテンプレートを使って試してみましょう。
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If you prefer to use your own text editor, you can also [download this HTML file](https://raw.githubusercontent.com/reactjs/reactjs.org/master/static/html/single-file-example.html), edit it, and open it from the local filesystem in your browser. It does a slow runtime code transformation, so we'd only recommend using this for simple demos.
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自前のテキストエディタを使いたい場合は、[この HTML ファイル](https://raw.githubusercontent.com/reactjs/reactjs.org/master/static/html/single-file-example.html)をダウンロード・編集して、ブラウザを使ってからローカルファイルシステムから開くことができます。ランタイムでの遅いコード変換が行われる為、簡単なデモに留めておくことをおすすめします。
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### Add React to a Website {#add-react-to-a-website}
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### React を Web サイトに追加する {#add-react-to-a-website}
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You can [add React to an HTML page in one minute](/docs/add-react-to-a-website.html). You can then either gradually expand its presence, or keep it contained to a few dynamic widgets.
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[React は HTML ページにすぐに追加することができます](/docs/add-react-to-a-website.html)。そのあと徐々に全体に反映させていくか、少数のダイナミックなウィジェットに留めるかはあなたの自由です。
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### Create a New React App {#create-a-new-react-app}
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### 新規 React アプリの作成 {#create-a-new-react-app}
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When starting a React project, [a simple HTML page with script tags](/docs/add-react-to-a-website.html) might still be the best option. It only takes a minute to set up!
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新しく React のプロジェクトを始めたい場合でも、まずは[シンプルな HTML ページに script タグを追加](/docs/add-react-to-a-website.html)するのがおすすめです。数分でセットアップできます！
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As your application grows, you might want to consider a more integrated setup. There are [several JavaScript toolchains](/docs/create-a-new-react-app.html) we recommend for larger applications. Each of them can work with little to no configuration and lets you take full advantage of the rich React ecosystem.
People come to React from different backgrounds and with different learning styles. Whether you prefer a more theoretical or a practical approach, we hope you'll find this section helpful.
The [React homepage](/) contains a few small React examples with a live editor. Even if you don't know anything about React yet, try changing their code and see how it affects the result.
If you feel that the React documentation goes at a faster pace than you're comfortable with, check out [this overview of React by Tania Rascia](https://www.taniarascia.com/getting-started-with-react/). It introduces the most important React concepts in a detailed, beginner-friendly way. Once you're done, give the documentation another try!
The React documentation assumes some familiarity with programming in the JavaScript language. You don't have to be an expert, but it's harder to learn both React and JavaScript at the same time.
We recommend going through [this JavaScript overview](https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript) to check your knowledge level. It will take you between 30 minutes and an hour but you will feel more confident learning React.
>Whenever you get confused by something in JavaScript, [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript)and[javascript.info](http://javascript.info/)are great websites to check. There are also [community support forums](/community/support.html) where you can ask for help.
If you prefer to **learn by doing,** check out our [practical tutorial](/tutorial/tutorial.html). In this tutorial, we build a tic-tac-toe game in React. You might be tempted to skip it because you're not building games -- but give it a chance. The techniques you'll learn in the tutorial are fundamental to building *any* React apps, and mastering it will give you a much deeper understanding.
If you prefer to **learn concepts step by step,** our [guide to main concepts](/docs/hello-world.html) is the best place to start. Every next chapter in it builds on the knowledge introduced in the previous chapters so you won't miss anything as you go along.
Many React users credit reading [Thinking in React](/docs/thinking-in-react.html) as the moment React finally "clicked" for them. It's probably the oldest React walkthrough but it's still just as relevant.
Sometimes people find third-party books and video courses more helpful than the official documentation. We maintain [a list of commonly recommended resources](/community/courses.html), some of which are free.
Once you're comfortable with the [main concepts](#main-concepts) and played with React a little bit, you might be interested in more advanced topics. This section will introduce you to the powerful, but less commonly used React features like [context](/docs/context.html)and [refs](/docs/refs-and-the-dom.html).
This documentation section is useful when you want to learn more details about a particular React API. For example, [`React.Component` API reference](/docs/react-component.html) can provide you with details on how `setState()`works, and what different lifecycle methods are useful for.
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この資料は特定の React API の詳細について学びたいときに役に立つでしょう。例えば、[`React.Component` API リファレンス](/docs/react-component.html)では `setState()`がどう機能しているかについてより詳細に記載されていたり、種々のライフサイクルメソッドがどのように役に立つかについて書かれています。
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### Glossary and FAQ {#glossary-and-faq}
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### 用語集と FAQ {#glossary-and-faq}
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The [glossary](/docs/glossary.html) contains an overview of the most common terms you'll see in the React documentation. There is also a FAQ section dedicated to short questions and answers about common topics, including [making AJAX requests](/docs/faq-ajax.html), [component state](/docs/faq-state.html), and [file structure](/docs/faq-structure.html).
The [React blog](/blog/) is the official source for the updates from the React team. Anything important, including release notes or deprecation notices, will be posted there first.
Not every React release deserves its own blog post, but you can find a detailed changelog for every release [in the`CHANGELOG.md` file in the React repository](https://github.com/facebook/react/blob/master/CHANGELOG.md), as well as on the [Releases](https://github.com/facebook/react) page.
This documentation always reflects the latest stable version of React. Since React 16, you can find older versions of the documentation [on a separate page](/versions). Note that documentation for past versions is snapshotted at the time of the release, and isn't being continuously updated.
If something is missing in the documentation or if you found some part confusing, please [file an issue for the documentation repository](https://github.com/reactjs/reactjs.org/issues/new) with your suggestions for improvement, or tweet at the [@reactjs account](https://twitter.com/reactjs). We love hearing from you!
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