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vjeux Document the Diff algorithm …8f24fcavjeux Add video at the bottom of the front page0993b61bricooke Update highlighted lines in tutorial …38d68fdjaredly rename this tip to be less confusing …9686487jaredly fixing capitalization1a9b213nicholasbs Fix typo (ot -> to)18410bfjaredly adding note about initializing state w/ props4f71ddfjaredly changes as requestedcb0cbccjaredly one linercd2fd80squidsoup Tutorial template markup needs a reference to jquery for the ajax calls …37e544dchenglou docs add input attrs for Dom Differences7eae8d3chenglou docs make all link start with /react/docsdbc8563Daniel15 Simple HTML to JSX converter, built during Hackathon 40 at Facebook. …2308f95
394 lines
13 KiB
HTML
394 lines
13 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
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<title>React | Why React?</title>
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<meta name="viewport" content="width=device-width">
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<meta property="og:title" content="React | Why React?" />
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<meta property="og:type" content="website" />
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<meta property="og:url" content="http://facebook.github.io/react/docs/why-react.html" />
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<meta property="og:image" content="http://facebook.github.io/react/img/logo_og.png" />
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<meta property="og:description" content="A JavaScript library for building user interfaces" />
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<meta property="fb:app_id" content="623268441017527" />
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<link rel="shortcut icon" href="/react/favicon.ico">
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<link rel="alternate" type="application/rss+xml" title="React" href="http://facebook.github.io/react/feed.xml">
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<link rel="stylesheet" href="/react/css/react.css">
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<link rel="stylesheet" href="/react/css/syntax.css">
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<link rel="stylesheet" href="/react/css/codemirror.css">
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<script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script>
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<script type="text/javascript">try{Typekit.load();}catch(e){}</script>
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<script type="text/javascript" src="/react/js/codemirror.js"></script>
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<script type="text/javascript" src="/react/js/javascript.js"></script>
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<script type="text/javascript" src="/react/js/react.min.js"></script>
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<script type="text/javascript" src="/react/js/JSXTransformer.js"></script>
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<script type="text/javascript" src="/react/js/live_editor.js"></script>
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<script type="text/javascript" src="/react/js/showdown.js"></script>
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</head>
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<body>
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<div class="container">
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<div class="nav-main">
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<div class="wrap">
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<a class="nav-home" href="/react/index.html">
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<img class="nav-logo" alt="" src="/react/img/logo_small.png" width="38" height="38">
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React
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</a>
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<ul class="nav-site">
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<li><a href="/react/docs/getting-started.html" class="active">docs</a></li>
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<li><a href="/react/support.html">support</a></li>
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<li><a href="/react/downloads.html">download</a></li>
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<li><a href="/react/blog/">blog</a></li>
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<li><a href="http://github.com/facebook/react">github</a>
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</ul>
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<!-- <iframe src="http://ghbtns.com/github-btn.html?user=facebook&repo=react.js&type=fork"allowtransparency="true" frameborder="0" scrolling="0" width="62" height="20"></iframe> -->
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</div>
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</div>
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<section class="content wrap documentationContent">
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<div class="nav-docs">
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<!-- Docs Nav -->
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<div class="nav-docs-section">
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<h3>Quick Start</h3>
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<ul>
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<li>
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<a href="/react/docs/getting-started.html">
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Getting Started
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</a>
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</li>
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<li>
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<a href="/react/docs/tutorial.html">
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Tutorial
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</a>
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</li>
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</ul>
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</div>
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<div class="nav-docs-section">
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<h3>Guides</h3>
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<ul>
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<li>
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<a href="/react/docs/why-react.html" class="active">
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Why React?
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</a>
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</li>
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<li>
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<a href="/react/docs/displaying-data.html">
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Displaying Data
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</a>
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<ul>
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<li>
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<a href="/react/docs/jsx-in-depth.html">
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JSX in Depth
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</a>
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</li>
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<li>
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<a href="/react/docs/jsx-gotchas.html">
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JSX Gotchas
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</a>
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</li>
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</ul>
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</li>
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<li>
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<a href="/react/docs/interactivity-and-dynamic-uis.html">
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Interactivity and Dynamic UIs
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</a>
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</li>
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<li>
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<a href="/react/docs/multiple-components.html">
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Multiple Components
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</a>
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</li>
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<li>
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<a href="/react/docs/reusable-components.html">
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Reusable Components
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</a>
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</li>
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<li>
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<a href="/react/docs/forms.html">
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Forms
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</a>
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</li>
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<li>
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<a href="/react/docs/working-with-the-browser.html">
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Working With the Browser
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</a>
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<ul>
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<li>
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<a href="/react/docs/more-about-refs.html">
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More About Refs
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</a>
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</li>
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</ul>
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</li>
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<li>
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<a href="/react/docs/tooling-integration.html">
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Tooling Integration
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</a>
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</li>
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<li>
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<a href="/react/docs/addons.html">
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Add-Ons
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</a>
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<ul>
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<li>
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<a href="/react/docs/animation.html">
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Animation
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</a>
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</li>
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<li>
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<a href="/react/docs/two-way-binding-helpers.html">
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Two-Way Binding Helpers
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</a>
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</li>
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<li>
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<a href="/react/docs/class-name-manipulation.html">
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Class Name Manipulation
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</a>
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</li>
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</ul>
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</li>
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<li>
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<a href="/react/docs/examples.html">
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Examples
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</a>
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</li>
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</ul>
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</div>
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<div class="nav-docs-section">
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<h3>Reference</h3>
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<ul>
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<li>
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<a href="/react/docs/top-level-api.html">
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Top-Level API
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</a>
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</li>
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<li>
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<a href="/react/docs/component-api.html">
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Component API
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</a>
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</li>
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<li>
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<a href="/react/docs/component-specs.html">
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Component Specs and Lifecycle
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</a>
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</li>
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<li>
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<a href="/react/docs/tags-and-attributes.html">
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Supported Tags and Attributes
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</a>
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</li>
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<li>
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<a href="/react/docs/events.html">
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Event System
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</a>
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</li>
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<li>
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<a href="/react/docs/dom-differences.html">
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DOM Differences
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</a>
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</li>
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<li>
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<a href="/react/docs/special-non-dom-attributes.html">
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Special Non-DOM attributes
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</a>
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</li>
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<li>
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<a href="/react/docs/reconciliation.html">
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Reconciliation
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</a>
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</li>
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</ul>
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</div>
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<!-- Tips Nav -->
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<div class="nav-docs-section">
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<h3>Tips</h3>
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<ul>
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<li>
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<a href="/react/tips/introduction.html">Introduction</a>
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</li>
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<li>
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<a href="/react/tips/inline-styles.html">Inline Styles</a>
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</li>
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<li>
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<a href="/react/tips/if-else-in-JSX.html">If-Else in JSX</a>
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</li>
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<li>
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<a href="/react/tips/self-closing-tag.html">Self-Closing Tag</a>
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</li>
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<li>
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<a href="/react/tips/maximum-number-of-jsx-root-nodes.html">Maximum Number of JSX Root Nodes</a>
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</li>
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<li>
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<a href="/react/tips/style-props-value-px.html">Shorthand for Specifying Pixel Values in style props</a>
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</li>
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<li>
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<a href="/react/tips/children-props-type.html">Type of the Children props</a>
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</li>
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<li>
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<a href="/react/tips/controlled-input-null-value.html">Value of null for Controlled Input</a>
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</li>
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<li>
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<a href="/react/tips/componentWillReceiveProps-not-triggered-after-mounting.html">componentWillReceiveProps Not Triggered After Mounting</a>
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</li>
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<li>
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<a href="/react/tips/props-in-getInitialState-as-anti-pattern.html">Props in getInitialState Is an Anti-Pattern</a>
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</li>
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<li>
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<a href="/react/tips/dom-event-listeners.html">DOM Event Listeners in a Component</a>
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</li>
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<li>
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<a href="/react/tips/initial-ajax.html">Load Initial Data via AJAX</a>
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</li>
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<li>
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<a href="/react/tips/false-in-jsx.html">False in JSX</a>
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</li>
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<li>
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<a href="/react/tips/communicate-between-components.html">Communicate Between Components</a>
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</li>
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</ul>
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</div>
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</div>
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<div class="inner-content">
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<h1>Why React?</h1>
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<div class="subHeader"></div>
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<p>React is a JavaScript library for creating user interfaces by Facebook and Instagram. Many people choose to think of React as the <strong>V</strong> in <strong><a href="http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller">MVC</a></strong>.</p>
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<p>We built React to solve one problem: <strong>building large applications with data that changes over time</strong>. To do this, React uses two main ideas.</p>
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<h3><a class="anchor" name="simple"></a>Simple <a class="hash-link" href="#simple">#</a></h3>
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<p>Simply express how your app should look at any given point in time, and React will automatically manage all UI updates when your underlying data changes.</p>
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<h3><a class="anchor" name="declarative"></a>Declarative <a class="hash-link" href="#declarative">#</a></h3>
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<p>When the data changes, React conceptually hits the "refresh" button, and knows to only update the changed parts.</p>
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<h2><a class="anchor" name="build-composable-components"></a>Build Composable Components <a class="hash-link" href="#build-composable-components">#</a></h2>
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<p>React is all about building reusable components. In fact, with React the <em>only</em> thing you do is build components. Since they're so encapsulated, components make code reuse, testing, and separation of concerns easy.</p>
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<h2><a class="anchor" name="give-it-five-minutes"></a>Give It Five Minutes <a class="hash-link" href="#give-it-five-minutes">#</a></h2>
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<p>React challenges a lot of conventional wisdom, and at first glance some of the ideas may seem crazy. <a href="http://37signals.com/svn/posts/3124-give-it-five-minutes">Give it five minutes</a> while reading this guide; those crazy ideas have worked for building thousands of components both inside and outside of Facebook and Instagram.</p>
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<h2><a class="anchor" name="learn-more"></a>Learn More <a class="hash-link" href="#learn-more">#</a></h2>
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<p>You can learn more about our motivations behind building React in <a href="http://facebook.github.io/react/blog/2013/06/05/why-react.html">this blog post</a>.</p>
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<div class="docs-prevnext">
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<a class="docs-next" href="/react/docs/displaying-data.html">Next →</a>
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</div>
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<div class="fb-comments" data-width="650" data-num-posts="10" data-href="http://facebook.github.io/react/docs/why-react.html"></div>
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</div>
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</section>
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<footer class="wrap">
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<div class="left">A Facebook & Instagram collaboration.</div>
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<div class="right">© 2013 Facebook Inc.</div>
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