mirror of
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Paul O’Shannessy
452 lines
14 KiB
HTML
452 lines
14 KiB
HTML
<!DOCTYPE html>
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<!--[if IE]><![endif]-->
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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 property="og:title" content="React | Why React?" />
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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:description" content="A JavaScript library for building user interfaces" />
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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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</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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<li>
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<a href="/react/docs/thinking-in-react.html">
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Thinking in React
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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>Community Resources</h3>
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<ul>
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<li>
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<a href="/react/docs/videos.html">
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Videos
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</a>
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</li>
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<li>
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<a href="/react/docs/complementary-tools.html">
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Complementary Tools
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</a>
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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>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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<li>
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<a href="/react/docs/test-utils.html">
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Test Utilities
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</a>
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</li>
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<li>
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<a href="/react/docs/clone-with-props.html">
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Cloning Components
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</a>
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</li>
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<li>
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<a href="/react/docs/update.html">
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Immutability Helpers
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</a>
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</li>
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</ul>
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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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<li>
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<a href="/react/tips/expose-component-functions.html">Expose Component Functions</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">
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A Facebook & Instagram collaboration.<br>
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<a href="/react/acknowledgements.html">Acknowledgements</a>
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</div>
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<div class="right">© 2014 Facebook Inc.</div>
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</footer>
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</div>
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