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</div>
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<div class="inner-content">
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<h1>
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JSX 깊이보기
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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/02.1-jsx-in-depth.ko-KR.md" target="_blank">Edit on GitHub</a>
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</h1>
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<div class="subHeader"></div>
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<p><a href="https://facebook.github.io/jsx/">JSX</a>는 XML과 비슷한 JavaScript문법 확장입니다. React에서 변환되는 간단한 JSX 구문을 사용하실 수 있습니다.</p>
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<h2><a class="anchor" name="-jsx"></a>왜 JSX인가? <a class="hash-link" href="#-jsx">#</a></h2>
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<p>React를 위해 꼭 JSX를 사용할 필요는 없고, 그냥 일반 JS를 사용할 수도 있습니만 JSX를 사용하기를 추천합니다. 왜냐하면, 어트리뷰트를 가진 트리 구조로 정의할 수 있는 간결하고 익숙한 문법이기 때문입니다.</p>
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<p>이것은 디자이너 같은 케쥬얼 개발자에게 더 익숙합니다.</p>
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<p>XML에는 여닫는 태그의 장점이 있습니다. 태그는 큰 트리일 때 함수 호출이나 객체 리터럴보다 읽기 쉬워 집니다.</p>
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<p>JSX는 JavaScript의 시맨틱을 변경하지 않습니다.</p>
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<h2><a class="anchor" name="html--vs.-react-"></a>HTML 태그 vs. React 컴포넌트 <a class="hash-link" href="#html--vs.-react-">#</a></h2>
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<p>React는 렌더 HTML 태그(문자열)이나 React 컴포넌트(클래스)일 수 있습니다.</p>
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<p>HTML 태그를 렌더하려면, 그냥 JSX에 소문자 태그를 사용하세요.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">myDivElement</span> <span class="o">=</span> <span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="s2">"foo"</span> <span class="o">/></span><span class="p">;</span>
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<span class="nx">ReactDOM</span><span class="p">.</span><span class="nx">render</span><span class="p">(</span><span class="nx">myDivElement</span><span class="p">,</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'example'</span><span class="p">));</span>
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</code></pre></div>
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<p>React 컴포넌트를 렌더하려면, 대문자로 시작하는 로컬 변수를 만드세요.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">MyComponent</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span><span class="cm">/*...*/</span><span class="p">});</span>
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<span class="kd">var</span> <span class="nx">myElement</span> <span class="o">=</span> <span class="o"><</span><span class="nx">MyComponent</span> <span class="nx">someProperty</span><span class="o">=</span><span class="p">{</span><span class="kc">true</span><span class="p">}</span> <span class="o">/></span><span class="p">;</span>
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<span class="nx">ReactDOM</span><span class="p">.</span><span class="nx">render</span><span class="p">(</span><span class="nx">myElement</span><span class="p">,</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'example'</span><span class="p">));</span>
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</code></pre></div>
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<p>React JSX는 대소문자를 로컬 컴포넌트 클래스와 HTML 태그를 구별하는 컨벤션으로 사용합니다.</p>
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<blockquote>
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<p>주의:</p>
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<p>JSX가 JavaScript기 때문에, <code>class</code>, <code>for</code>같은 식별자는 XML 어트리뷰트 이름으로
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권장하지 않습니다. 대신, React DOM 컴포넌트는 각각 <code>className</code>, <code>htmlFor</code>같은
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DOM 프로퍼티 이름을 기대합니다.</p>
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</blockquote>
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<p><a name="the-transform"></a></p>
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<h2><a class="anchor" name=""></a>변환 <a class="hash-link" href="#">#</a></h2>
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<p>React JSX는 XML같은 문법에서 네이티브 JavaScript로 변환됩니다. XML 엘리먼트, 어트리뷰트, 자식은 <code>React.createElement</code>에 넘겨지는 인자로 변환됩니다.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">Nav</span><span class="p">;</span>
|
|
<span class="c1">// 입력 (JSX):</span>
|
|
<span class="kd">var</span> <span class="nx">app</span> <span class="o">=</span> <span class="o"><</span><span class="nx">Nav</span> <span class="nx">color</span><span class="o">=</span><span class="s2">"blue"</span> <span class="o">/></span><span class="p">;</span>
|
|
<span class="c1">// 출력 (JS):</span>
|
|
<span class="kd">var</span> <span class="nx">app</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="nx">Nav</span><span class="p">,</span> <span class="p">{</span><span class="nx">color</span><span class="o">:</span><span class="s2">"blue"</span><span class="p">});</span>
|
|
</code></pre></div>
|
|
<p><code><Nav /></code>를 사용하려면, <code>Nav</code>변수는 스코프에 있어야 합니다.</p>
|
|
|
|
<p>JSX에서는 XML 구문으로 자식을 지정할 수도 있습니다.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">Nav</span><span class="p">,</span> <span class="nx">Profile</span><span class="p">;</span>
|
|
<span class="c1">// 입력 (JSX):</span>
|
|
<span class="kd">var</span> <span class="nx">app</span> <span class="o">=</span> <span class="o"><</span><span class="nx">Nav</span> <span class="nx">color</span><span class="o">=</span><span class="s2">"blue"</span><span class="o">><</span><span class="nx">Profile</span><span class="o">></span><span class="nx">click</span><span class="o"><</span><span class="err">/Profile></Nav>;</span>
|
|
<span class="c1">// 출력 (JS):</span>
|
|
<span class="kd">var</span> <span class="nx">app</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span>
|
|
<span class="nx">Nav</span><span class="p">,</span>
|
|
<span class="p">{</span><span class="nx">color</span><span class="o">:</span><span class="s2">"blue"</span><span class="p">},</span>
|
|
<span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="nx">Profile</span><span class="p">,</span> <span class="kc">null</span><span class="p">,</span> <span class="s2">"click"</span><span class="p">)</span>
|
|
<span class="p">);</span>
|
|
</code></pre></div>
|
|
<p>클래스에 <a href="/react/docs/component-specs-ko-KR.html#displayName">displayName</a>이 정의되어 있지 않으면 JSX는 변수명을 displayName으로 간주할 것입니다:</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="c1">// 입력 (JSX):</span>
|
|
<span class="kd">var</span> <span class="nx">Nav</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span> <span class="p">});</span>
|
|
<span class="c1">// 출력 (JS):</span>
|
|
<span class="kd">var</span> <span class="nx">Nav</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span><span class="nx">displayName</span><span class="o">:</span> <span class="s2">"Nav"</span><span class="p">,</span> <span class="p">});</span>
|
|
</code></pre></div>
|
|
<p><a href="https://babeljs.io/repl/">바벨 REPL</a>를 보면 JSX에서 어떻게 네이티브 JavaScript로 변환(desugars)하는지 볼 수 있고, <a href="/react/html-jsx.html">HTML-JSX 변환기</a>는 이미 있는 HTML을 JSX로 변환해 줍니다.</p>
|
|
|
|
<p>JSX를 사용 하시려면, <a href="/react/docs/getting-started-ko-KR.html">시작하기</a> 가이드에서 어떻게 컴파일을 하기 위해 설정하는지 보실 수 있습니다.</p>
|
|
|
|
<blockquote>
|
|
<p>주의:</p>
|
|
|
|
<p>JSX 표현식은 언제나 ReactElement로 변환됩니다. 실제 구현의 세부사항은 많이
|
|
다를 수 있습니다. 최적화 모드는 ReactElement를 <code>React.createElement</code>에서 검증
|
|
코드를 우회하는 객체 리터럴로 ReactElement를 인라인으로 만들 수 있습니다.</p>
|
|
</blockquote>
|
|
<h2><a class="anchor" name="--"></a>네임스페이스를 사용한 컴포넌트 <a class="hash-link" href="#--">#</a></h2>
|
|
<p>폼같은 자식을 많이 가지는 컴포넌트를 만든다면, 많은 변수 선언을 하게 될 것입니다.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="c1">// 변수 선언의 어색한 블록</span>
|
|
<span class="kd">var</span> <span class="nx">Form</span> <span class="o">=</span> <span class="nx">MyFormComponent</span><span class="p">;</span>
|
|
<span class="kd">var</span> <span class="nx">FormRow</span> <span class="o">=</span> <span class="nx">Form</span><span class="p">.</span><span class="nx">Row</span><span class="p">;</span>
|
|
<span class="kd">var</span> <span class="nx">FormLabel</span> <span class="o">=</span> <span class="nx">Form</span><span class="p">.</span><span class="nx">Label</span><span class="p">;</span>
|
|
<span class="kd">var</span> <span class="nx">FormInput</span> <span class="o">=</span> <span class="nx">Form</span><span class="p">.</span><span class="nx">Input</span><span class="p">;</span>
|
|
|
|
<span class="kd">var</span> <span class="nx">App</span> <span class="o">=</span> <span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">Form</span><span class="o">></span>
|
|
<span class="o"><</span><span class="nx">FormRow</span><span class="o">></span>
|
|
<span class="o"><</span><span class="nx">FormLabel</span> <span class="o">/></span>
|
|
<span class="o"><</span><span class="nx">FormInput</span> <span class="o">/></span>
|
|
<span class="o"><</span><span class="err">/FormRow></span>
|
|
<span class="o"><</span><span class="err">/Form></span>
|
|
<span class="p">);</span>
|
|
</code></pre></div>
|
|
<p>더 간단하고 쉽게 <em>네임스페이스를 사용한 컴포넌트</em>를 사용해서, 다른 컴포넌트를 어트리뷰트로 가지는 하나의 컴포넌트만 쓸 수 있습니다.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">Form</span> <span class="o">=</span> <span class="nx">MyFormComponent</span><span class="p">;</span>
|
|
|
|
<span class="kd">var</span> <span class="nx">App</span> <span class="o">=</span> <span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">Form</span><span class="o">></span>
|
|
<span class="o"><</span><span class="nx">Form</span><span class="p">.</span><span class="nx">Row</span><span class="o">></span>
|
|
<span class="o"><</span><span class="nx">Form</span><span class="p">.</span><span class="nx">Label</span> <span class="o">/></span>
|
|
<span class="o"><</span><span class="nx">Form</span><span class="p">.</span><span class="nx">Input</span> <span class="o">/></span>
|
|
<span class="o"><</span><span class="err">/Form.Row></span>
|
|
<span class="o"><</span><span class="err">/Form></span>
|
|
<span class="p">);</span>
|
|
</code></pre></div>
|
|
<p>이렇게 하려면, <em>"sub-components"</em>를 메인 컴포넌트의 어트리뷰트로 만들 필요가 있습니다.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">MyFormComponent</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span> <span class="p">...</span> <span class="p">});</span>
|
|
|
|
<span class="nx">MyFormComponent</span><span class="p">.</span><span class="nx">Row</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span> <span class="p">...</span> <span class="p">});</span>
|
|
<span class="nx">MyFormComponent</span><span class="p">.</span><span class="nx">Label</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span> <span class="p">...</span> <span class="p">});</span>
|
|
<span class="nx">MyFormComponent</span><span class="p">.</span><span class="nx">Input</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span> <span class="p">...</span> <span class="p">});</span>
|
|
</code></pre></div>
|
|
<p>코드를 컴파일할 때 JSX는 이것을 제대로 처리해 줍니다.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">App</span> <span class="o">=</span> <span class="p">(</span>
|
|
<span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="nx">Form</span><span class="p">,</span> <span class="kc">null</span><span class="p">,</span>
|
|
<span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="nx">Form</span><span class="p">.</span><span class="nx">Row</span><span class="p">,</span> <span class="kc">null</span><span class="p">,</span>
|
|
<span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="nx">Form</span><span class="p">.</span><span class="nx">Label</span><span class="p">,</span> <span class="kc">null</span><span class="p">),</span>
|
|
<span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="nx">Form</span><span class="p">.</span><span class="nx">Input</span><span class="p">,</span> <span class="kc">null</span><span class="p">)</span>
|
|
<span class="p">)</span>
|
|
<span class="p">)</span>
|
|
<span class="p">);</span>
|
|
</code></pre></div>
|
|
<blockquote>
|
|
<p>주의:</p>
|
|
|
|
<p>이 기능은 <a href="/react/blog/2014/07/17/react-v0.11.html#jsx">v0.11</a> 이상에만 있습니다.</p>
|
|
</blockquote>
|
|
<h2><a class="anchor" name="javascript-"></a>JavaScript 표현식 <a class="hash-link" href="#javascript-">#</a></h2><h3><a class="anchor" name="-"></a>어트리뷰트 표현식 <a class="hash-link" href="#-">#</a></h3>
|
|
<p>JavaScript 표현식을 어트리뷰트 값으로 사용하려면, 표현식을 쌍따옴표(<code>""</code>)대신 중괄호(<code>{}</code>)로 감싸야 합니다.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="c1">// 입력 (JSX):</span>
|
|
<span class="kd">var</span> <span class="nx">person</span> <span class="o">=</span> <span class="o"><</span><span class="nx">Person</span> <span class="nx">name</span><span class="o">=</span><span class="p">{</span><span class="nb">window</span><span class="p">.</span><span class="nx">isLoggedIn</span> <span class="o">?</span> <span class="nb">window</span><span class="p">.</span><span class="nx">name</span> <span class="o">:</span> <span class="s1">''</span><span class="p">}</span> <span class="o">/></span><span class="p">;</span>
|
|
<span class="c1">// 출력 (JS):</span>
|
|
<span class="kd">var</span> <span class="nx">person</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span>
|
|
<span class="nx">Person</span><span class="p">,</span>
|
|
<span class="p">{</span><span class="nx">name</span><span class="o">:</span> <span class="nb">window</span><span class="p">.</span><span class="nx">isLoggedIn</span> <span class="o">?</span> <span class="nb">window</span><span class="p">.</span><span class="nx">name</span> <span class="o">:</span> <span class="s1">''</span><span class="p">}</span>
|
|
<span class="p">);</span>
|
|
</code></pre></div><h3><a class="anchor" name="-"></a>불린 어트리뷰트 <a class="hash-link" href="#-">#</a></h3>
|
|
<p>어트리뷰트의 값을 생략하면 JSX는 값을 <code>true</code>로 취급합니다. 어트리뷰트 표현식에 <code>false</code>를 넘기려면 사용해야만 합니다. HTML 폼 엘리먼트에 <code>disabled</code>, <code>required</code>, <code>checked</code>, <code>readOnly</code>같은 어트리뷰트를 사용할 일이 자주 있습니다.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="c1">// JSX에서 이 두 줄은 똑같이 버튼을 비활성화합니다.</span>
|
|
<span class="o"><</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">"button"</span> <span class="nx">disabled</span> <span class="o">/></span><span class="p">;</span>
|
|
<span class="o"><</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">"button"</span> <span class="nx">disabled</span><span class="o">=</span><span class="p">{</span><span class="kc">true</span><span class="p">}</span> <span class="o">/></span><span class="p">;</span>
|
|
|
|
<span class="c1">// 그리고 JSX에서 이 두 줄은 똑같이 버튼을 비활성화하지 않습니다.</span>
|
|
<span class="o"><</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">"button"</span> <span class="o">/></span><span class="p">;</span>
|
|
<span class="o"><</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">"button"</span> <span class="nx">disabled</span><span class="o">=</span><span class="p">{</span><span class="kc">false</span><span class="p">}</span> <span class="o">/></span><span class="p">;</span>
|
|
</code></pre></div><h3><a class="anchor" name="-"></a>자식 표현식 <a class="hash-link" href="#-">#</a></h3>
|
|
<p>비슷하게, JavaScript 표현식을 자식을 표현하는 데 사용할 수 있습니다.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="c1">// 입력 (JSX):</span>
|
|
<span class="kd">var</span> <span class="nx">content</span> <span class="o">=</span> <span class="o"><</span><span class="nx">Container</span><span class="o">></span><span class="p">{</span><span class="nb">window</span><span class="p">.</span><span class="nx">isLoggedIn</span> <span class="o">?</span> <span class="o"><</span><span class="nx">Nav</span> <span class="o">/></span> <span class="o">:</span> <span class="o"><</span><span class="nx">Login</span> <span class="o">/></span><span class="p">}</span><span class="o"><</span><span class="err">/Container>;</span>
|
|
<span class="c1">// 출력 (JS):</span>
|
|
<span class="kd">var</span> <span class="nx">content</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span>
|
|
<span class="nx">Container</span><span class="p">,</span>
|
|
<span class="kc">null</span><span class="p">,</span>
|
|
<span class="nb">window</span><span class="p">.</span><span class="nx">isLoggedIn</span> <span class="o">?</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="nx">Nav</span><span class="p">)</span> <span class="o">:</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="nx">Login</span><span class="p">)</span>
|
|
<span class="p">);</span>
|
|
</code></pre></div><h3><a class="anchor" name=""></a>주석 <a class="hash-link" href="#">#</a></h3>
|
|
<p>JSX에 주석을 넣기는 쉽습니다. 그냥 JS 표현식과 같습니다. 그냥 태그의 자식 섹션에서만 조심하시면 됩니다. 이럴 땐 주석 주변에 <code>{}</code>를 감싸야 합니다.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">content</span> <span class="o">=</span> <span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">Nav</span><span class="o">></span>
|
|
<span class="p">{</span><span class="cm">/* 자식 주석, {}로 감싼다 */</span><span class="p">}</span>
|
|
<span class="o"><</span><span class="nx">Person</span>
|
|
<span class="cm">/* 여러</span>
|
|
<span class="cm"> 줄</span>
|
|
<span class="cm"> 주석 */</span>
|
|
<span class="nx">name</span><span class="o">=</span><span class="p">{</span><span class="nb">window</span><span class="p">.</span><span class="nx">isLoggedIn</span> <span class="o">?</span> <span class="nb">window</span><span class="p">.</span><span class="nx">name</span> <span class="o">:</span> <span class="s1">''</span><span class="p">}</span> <span class="c1">// 줄 끝부분 주석</span>
|
|
<span class="o">/></span>
|
|
<span class="o"><</span><span class="err">/Nav></span>
|
|
<span class="p">);</span>
|
|
</code></pre></div>
|
|
<blockquote>
|
|
<p>주의:</p>
|
|
|
|
<p>JSX 는 HTML과 비슷하지만 완전히 같지는 않습니다. 중요한 차이점을 보시려면 <a href="/react/docs/jsx-gotchas-ko-KR.html">JSX gotchas</a>를 보세요.</p>
|
|
</blockquote>
|
|
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<div class="docs-prevnext">
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<a class="docs-prev" href="/react/docs/displaying-data-ko-KR.html">← Prev</a>
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<a class="docs-next" href="/react/docs/jsx-spread-ko-KR.html">Next →</a>
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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">
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© 2013–2016 Facebook Inc.<br>
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Documentation licensed under <a href="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>.
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