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<time class="post-full-meta-date" datetime="30 September 2019">30 September 2019</time>
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<a href='/category/react/'>REACT</a>
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<h1 class="post-full-title">React 튜토리얼</h1>
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<h3 id="1-개요">1. 개요</h3>
<p>React는 유저 인터페이스 구현을 위한 Javascript 라이브러리중 하나입니다.</p>
<p>React는 여러 종류의 컴포넌트들을 가지고 있지만, 우리는 React.Component의 서브 클래스를 사용하여
시작 할 것입니다.</p>
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">class</span> <span class="nx">HomeCmp</span> <span class="kd">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
<span class="nx">render</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">(</span>
<span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="dl">"</span><span class="s2">homeWrp</span><span class="dl">"</span><span class="o">></span>
<span class="o"><</span><span class="nx">h1</span><span class="o">></span><span class="nx">Web</span> <span class="nx">page</span> <span class="nx">list</span> <span class="k">for</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="sr">/h1</span><span class="err">>
</span> <span class="o"><</span><span class="nx">ul</span><span class="o">></span>
<span class="o"><</span><span class="nx">li</span><span class="o">></span><span class="nx">Instagram</span><span class="o"><</span><span class="sr">/li</span><span class="err">>
</span> <span class="o"><</span><span class="nx">li</span><span class="o">></span><span class="nx">Naver</span><span class="o"><</span><span class="sr">/li</span><span class="err">>
</span> <span class="o"><</span><span class="nx">li</span><span class="o">></span><span class="nx">Google</span><span class="o"><</span><span class="sr">/li</span><span class="err">>
</span> <span class="o"><</span><span class="sr">/ul</span><span class="err">>
</span> <span class="o"><</span><span class="sr">/div</span><span class="err">>
</span> <span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div></div>
<p>XML과 비슷한 태그들을 사용하게 되는데, 작성한 컴포넌트는 React에게 무엇을 렌더링 하고싶은지 알려줍니다.
그 후 React는 데이터가 변경될때, 올바른 컴포넌트들을 업테이트 하고, 렌더링합니다.</p>
<p>여기에서 HomeCmp는 React 컴포넌트 클래스 혹은 React 컴포넌트 타입입니다.
하나의 컴포넌트는 props라 불리는 파라미터를 사용하며, render 메서드를 통해 표시할 뷰 계층 구조를 반환합니다.</p>
<p>render 메서든느 렌더링하길 원하는 내용을 반환하면 REact는 그 내용을 가져와 스크린에 렌더링 합니다.
특히 render는 React 엘리먼트를 반환하는데 이는 렌더링 할 부분에 대한 간단한 내용입니다.</p>
<p>대부분의 Rect 개발자들은 이 구조를 더 쉽게 작성할 수 있게 해주는 JSX라는 문법을 사용합니다.
<code class="language-plaintext highlighter-rouge"><div/></code> 라 쓰면 빌드시 React.createElement(‘div’)로 변환 되는데, 위의 코드는 아래의 코드와 동일합니다.</p>
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="k">return</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="dl">"</span><span class="s2">div</span><span class="dl">"</span><span class="p">,</span> <span class="p">{</span> <span class="na">className</span><span class="p">:</span> <span class="dl">"</span><span class="s2">homeWrp</span><span class="dl">"</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="dl">"</span><span class="s2">h1</span><span class="dl">"</span><span class="p">,</span> <span class="kc">null</span><span class="p">,</span> <span class="dl">"</span><span class="s2">Web page list for</span><span class="dl">"</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="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="dl">"</span><span class="s2">ul</span><span class="dl">"</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="dl">"</span><span class="s2">li</span><span class="dl">"</span><span class="p">,</span> <span class="kc">null</span><span class="p">,</span> <span class="dl">"</span><span class="s2">Instagram</span><span class="dl">"</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="dl">"</span><span class="s2">li</span><span class="dl">"</span><span class="p">,</span> <span class="kc">null</span><span class="p">,</span> <span class="dl">"</span><span class="s2">Naver</span><span class="dl">"</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="dl">"</span><span class="s2">li</span><span class="dl">"</span><span class="p">,</span> <span class="kc">null</span><span class="p">,</span> <span class="dl">"</span><span class="s2">Google</span><span class="dl">"</span><span class="p">)</span>
<span class="p">)</span>
<span class="p">);</span>
</code></pre></div></div>
<p>createdElement()에 대해 더 많은 내용이 궁금하면 <a href="https://reactjs-kr.firebaseapp.com/docs/react-api.html#createelement" target="_blank">API reference</a> 에 자세한 설명이 있습니다.</p>
<p>튜토리얼에서는, createdElement()를 직접적으로 사용하지 않고 JSX를 사용하겠습니다.</p>
<p>JSX에서는 중괄호 안에 Javascript 문법을 사용할수 있습니다. 각 React 엘리먼트는 변수에 저장하거나
프로그램 여기저기에 전달할 수 있는 실제 Javascript 객체입니다.</p>
<p>HomeCmp 컴포넌트는 내장된 DOM 컴포넌트만 랜더링하지만 <code class="language-plaintext highlighter-rouge"><HomeCmp /></code> 코드를 작성하여 커스텀 React 컴포넌트를 쉽게 구성할 수 있습니다.
각 컴포넌트는 캡슐화되어 독립적으로 동작할 수 있기 때문에 간단한 컴포넌트들로 복잡한 UI를 구현할 수 있습니다.</p>
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