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HTML
561 lines
25 KiB
HTML
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<!DOCTYPE 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 Top-Level API - React</title>
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React
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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/reference-react.md" target="_blank">Edit on GitHub</a>
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<h1>
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React Top-Level API
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</h1>
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<div class="subHeader"></div>
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<p><code>React</code> is the entry point to the React library. If you load React from a <code><script></code> tag, these top-level APIs are available on the <code>React</code> global. If you use ES6 with npm, you can write <code>import React from 'react'</code>. If you use ES5 with npm, you can write <code>var React = require('react')</code>.</p>
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<h2>Overview</h2>
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<h3>Components</h3>
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<p>React components let you split the UI into independent, reusable pieces, and think about each piece in isolation. React components can be defined by subclassing <code>React.Component</code> or <code>React.PureComponent</code>.</p>
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<ul>
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<li><a href="#react.component"><code>React.Component</code></a></li>
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<li><a href="#react.purecomponent"><code>React.PureComponent</code></a></li>
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</ul>
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<p>If you don't use ES6 classes, you may use the <code>create-react-class</code> module instead. See <a href="/react/docs/react-without-es6.html">Using React without ES6</a> for more information.</p>
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<h3>Creating React Elements</h3>
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<p>We recommend <a href="/react/docs/introducing-jsx.html">using JSX</a> to describe what your UI should look like. Each JSX element is just syntactic sugar for calling <a href="#createelement"><code>React.createElement()</code></a>. You will not typically invoke the following methods directly if you are using JSX.</p>
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<ul>
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<li><a href="#createelement"><code>createElement()</code></a></li>
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<li><a href="#createfactory"><code>createFactory()</code></a></li>
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</ul>
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<p>See <a href="/react/docs/react-without-jsx.html">Using React without JSX</a> for more information.</p>
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<h3>Transforming Elements</h3>
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<p><code>React</code> also provides some other APIs:</p>
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<ul>
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<li><a href="#cloneelement"><code>cloneElement()</code></a></li>
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<li><a href="#isvalidelement"><code>isValidElement()</code></a></li>
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<li><a href="#react.children"><code>React.Children</code></a></li>
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</ul>
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<hr>
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<h2>Reference</h2>
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<h3><code>React.Component</code></h3>
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<p><code>React.Component</code> is the base class for React components when they are defined using <a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Classes">ES6 classes</a>.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">class</span> <span class="nx">Greeting</span> <span class="kr">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
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<span class="nx">render</span><span class="p">()</span> <span class="p">{</span>
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<span class="k">return</span> <span class="o"><</span><span class="nx">h1</span><span class="o">></span><span class="nx">Hello</span><span class="p">,</span> <span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">name</span><span class="p">}</span><span class="o"><</span><span class="err">/h1>;</span>
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<span class="p">}</span>
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<span class="p">}</span>
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</code></pre></div>
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<p>See the <a href="/react/docs/react-component.html">React.Component API Reference</a> for a list of methods and properties related to the base <code>React.Component</code> class.</p>
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<hr>
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<h3><code>React.PureComponent</code></h3>
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<p><code>React.PureComponent</code> is exactly like <a href="#react.component"><code>React.Component</code></a> but implements <a href="/react/docs/react-component.html#shouldcomponentupdate"><code>shouldComponentUpdate()</code></a> with a shallow prop and state comparison.</p>
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<p>If your React component's <code>render()</code> function renders the same result given the same props and state, you can use <code>React.PureComponent</code> for a performance boost in some cases.</p>
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<blockquote>
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<p>Note</p>
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<p><code>React.PureComponent</code>'s <code>shouldComponentUpdate()</code> only shallowly compares the objects. If these contain complex data structures, it may produce false-negatives for deeper differences. Only extend <code>PureComponent</code> when you expect to have simple props and state, or use <a href="/react/docs/react-component.html#forceupdate"><code>forceUpdate()</code></a> when you know deep data structures have changed. Or, consider using <a href="https://facebook.github.io/immutable-js/">immutable objects</a> to facilitate fast comparisons of nested data.</p>
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<p>Furthermore, <code>React.PureComponent</code>'s <code>shouldComponentUpdate()</code> skips prop updates for the whole component subtree. Make sure all the children components are also "pure".</p>
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</blockquote>
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<hr>
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<h3><code>createElement()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span>
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<span class="nx">type</span><span class="p">,</span>
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<span class="p">[</span><span class="nx">props</span><span class="p">],</span>
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<span class="p">[...</span><span class="nx">children</span><span class="p">]</span>
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<span class="p">)</span>
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</code></pre></div>
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<p>Create and return a new <a href="/react/docs/rendering-elements.html">React element</a> of the given type. The type argument can be either a tag name string (such as <code>'div'</code> or <code>'span'</code>), or a <a href="/react/docs/components-and-props.html">React component</a> type (a class or a function).</p>
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<p>Convenience wrappers around <code>React.createElement()</code> for DOM components are provided by <code>React.DOM</code>. For example, <code>React.DOM.a(...)</code> is a convenience wrapper for <code>React.createElement('a', ...)</code>. They are considered legacy, and we encourage you to either use JSX or use <code>React.createElement()</code> directly instead.</p>
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<p>Code written with <a href="/react/docs/introducing-jsx.html">JSX</a> will be converted to use <code>React.createElement()</code>. You will not typically invoke <code>React.createElement()</code> directly if you are using JSX. See <a href="/react/docs/react-without-jsx.html">React Without JSX</a> to learn more.</p>
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<hr>
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<h3><code>cloneElement()</code></h3>
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<div class="highlight"><pre><code class="language-text" data-lang="text">React.cloneElement(
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element,
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[props],
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[...children]
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)
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</code></pre></div>
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<p>Clone and return a new React element using <code>element</code> as the starting point. The resulting element will have the original element's props with the new props merged in shallowly. New children will replace existing children. <code>key</code> and <code>ref</code> from the original element will be preserved.</p>
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<p><code>React.cloneElement()</code> is almost equivalent to:</p>
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<div class="highlight"><pre><code class="language-js" data-lang="js"><span class="o"><</span><span class="nx">element</span><span class="p">.</span><span class="nx">type</span> <span class="p">{...</span><span class="nx">element</span><span class="p">.</span><span class="nx">props</span><span class="p">}</span> <span class="p">{...</span><span class="nx">props</span><span class="p">}</span><span class="o">></span><span class="p">{</span><span class="nx">children</span><span class="p">}</span><span class="o"><</span><span class="err">/element.type></span>
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</code></pre></div>
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<p>However, it also preserves <code>ref</code>s. This means that if you get a child with a <code>ref</code> on it, you won't accidentally steal it from your ancestor. You will get the same <code>ref</code> attached to your new element.</p>
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<p>This API was introduced as a replacement of the deprecated <code>React.addons.cloneWithProps()</code>.</p>
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<hr>
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<h3><code>createFactory()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">React</span><span class="p">.</span><span class="nx">createFactory</span><span class="p">(</span><span class="nx">type</span><span class="p">)</span>
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</code></pre></div>
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<p>Return a function that produces React elements of a given type. Like <a href="#createElement"><code>React.createElement()</code></a>, the type argument can be either a tag name string (such as <code>'div'</code> or <code>'span'</code>), or a <a href="/react/docs/components-and-props.html">React component</a> type (a class or a function).</p>
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<p>This helper is considered legacy, and we encourage you to either use JSX or use <code>React.createElement()</code> directly instead.</p>
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<p>You will not typically invoke <code>React.createFactory()</code> directly if you are using JSX. See <a href="/react/docs/react-without-jsx.html">React Without JSX</a> to learn more.</p>
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<hr>
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<h3><code>isValidElement()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">React</span><span class="p">.</span><span class="nx">isValidElement</span><span class="p">(</span><span class="nx">object</span><span class="p">)</span>
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</code></pre></div>
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<p>Verifies the object is a React element. Returns <code>true</code> or <code>false</code>.</p>
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<hr>
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<h3><code>React.Children</code></h3>
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<p><code>React.Children</code> provides utilities for dealing with the <code>this.props.children</code> opaque data structure.</p>
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<h4><code>React.Children.map</code></h4>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">React</span><span class="p">.</span><span class="nx">Children</span><span class="p">.</span><span class="nx">map</span><span class="p">(</span><span class="nx">children</span><span class="p">,</span> <span class="kd">function</span><span class="p">[(</span><span class="nx">thisArg</span><span class="p">)])</span>
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</code></pre></div>
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<p>Invokes a function on every immediate child contained within <code>children</code> with <code>this</code> set to <code>thisArg</code>. If <code>children</code> is a keyed fragment or array it will be traversed: the function will never be passed the container objects. If children is <code>null</code> or <code>undefined</code>, returns <code>null</code> or <code>undefined</code> rather than an array.</p>
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<h4><code>React.Children.forEach</code></h4>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">React</span><span class="p">.</span><span class="nx">Children</span><span class="p">.</span><span class="nx">forEach</span><span class="p">(</span><span class="nx">children</span><span class="p">,</span> <span class="kd">function</span><span class="p">[(</span><span class="nx">thisArg</span><span class="p">)])</span>
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</code></pre></div>
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<p>Like <a href="#react.children.map"><code>React.Children.map()</code></a> but does not return an array.</p>
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<h4><code>React.Children.count</code></h4>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">React</span><span class="p">.</span><span class="nx">Children</span><span class="p">.</span><span class="nx">count</span><span class="p">(</span><span class="nx">children</span><span class="p">)</span>
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</code></pre></div>
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<p>Returns the total number of components in <code>children</code>, equal to the number of times that a callback passed to <code>map</code> or <code>forEach</code> would be invoked.</p>
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<h4><code>React.Children.only</code></h4>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">React</span><span class="p">.</span><span class="nx">Children</span><span class="p">.</span><span class="nx">only</span><span class="p">(</span><span class="nx">children</span><span class="p">)</span>
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</code></pre></div>
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<p>Returns the only child in <code>children</code>. Throws otherwise.</p>
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<h4><code>React.Children.toArray</code></h4>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">React</span><span class="p">.</span><span class="nx">Children</span><span class="p">.</span><span class="nx">toArray</span><span class="p">(</span><span class="nx">children</span><span class="p">)</span>
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</code></pre></div>
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<p>Returns the <code>children</code> opaque data structure as a flat array with keys assigned to each child. Useful if you want to manipulate collections of children in your render methods, especially if you want to reorder or slice <code>this.props.children</code> before passing it down.</p>
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<blockquote>
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<p>Note:</p>
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<p><code>React.Children.toArray()</code> changes keys to preserve the semantics of nested arrays when flattening lists of children. That is, <code>toArray</code> prefixes each key in the returned array so that each element's key is scoped to the input array containing it.</p>
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</blockquote>
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<div class="docs-prevnext">
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</div>
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</div>
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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/installation.html">Installation</a>
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</li>
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<li>
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<a href="/react/docs/hello-world.html">Hello World</a>
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</li>
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<li>
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<a href="/react/docs/introducing-jsx.html">Introducing JSX</a>
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</li>
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<li>
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<a href="/react/docs/rendering-elements.html">Rendering Elements</a>
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</li>
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<li>
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<a href="/react/docs/components-and-props.html">Components and Props</a>
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</li>
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<li>
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<a href="/react/docs/state-and-lifecycle.html">State and Lifecycle</a>
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<li>
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<a href="/react/docs/handling-events.html">Handling Events</a>
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<li>
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<a href="/react/docs/conditional-rendering.html">Conditional Rendering</a>
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</li>
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<li>
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<a href="/react/docs/lists-and-keys.html">Lists and Keys</a>
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</li>
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<li>
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<a href="/react/docs/forms.html">Forms</a>
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</li>
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<li>
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<a href="/react/docs/lifting-state-up.html">Lifting State Up</a>
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</li>
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<li>
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<a href="/react/docs/composition-vs-inheritance.html">Composition vs Inheritance</a>
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</li>
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<li>
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<a href="/react/docs/thinking-in-react.html">Thinking In React</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>Advanced Guides</h3>
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<ul>
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<li>
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<a href="/react/docs/jsx-in-depth.html">JSX In Depth</a>
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</li>
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<li>
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<a href="/react/docs/typechecking-with-proptypes.html">Typechecking With PropTypes</a>
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</li>
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<li>
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<a href="/react/docs/refs-and-the-dom.html">Refs and the DOM</a>
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</li>
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<li>
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<a href="/react/docs/uncontrolled-components.html">Uncontrolled Components</a>
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</li>
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<li>
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<a href="/react/docs/optimizing-performance.html">Optimizing Performance</a>
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