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- <h1 id="상태">상태</h1>
- <h3 id="단일-상태-트리">단일 상태 트리</h3>
- <p>Vuex는 <strong>단일 상태 트리</strong> 를 사용합니다. 즉, 이 단일 객체는 모든 애플리케이션 수준의 상태를 포함하며 "원본 소스" 역할을 합니다. 이는 각 애플리케이션마다 하나의 저장소만 갖게 된다는 것을 의미합니다. 단일 상태 트리를 사용하면 특정 상태를 쉽게 찾을 수 있으므로 디버깅을 위해 현재 앱 상태의 스냅 샷을 쉽게 가져올 수 있습니다.</p>
- <p>단일 상태 트리는 모듈성과 충돌하지 않습니다. 나중에 상태와 변이를 하위 모듈로 분할하는 방법에 대해 설명합니다.</p>
- <h3 id="vuex-상태를-vue-컴포넌트에서-가져오기">Vuex 상태를 Vue 컴포넌트에서 가져오기</h3>
- <p>그러면 Vue 컴포넌트에서 저장소 내부의 상태를 어떻게 표시하나요? Vuex 저장소는 반응적이기 때문에 저장소에서 상태를 "검색"하는 가장 간단한 방법은 <a href="http://kr.vuejs.org/guide/computed.html" target="_blank">계산된 속성</a>내에서 일부 저장소 상태를 가져오는 것입니다.</p>
- <pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// Counter 컴포넌트를 만듭니다</span>
- <span class="token keyword">const</span> Counter <span class="token operator">=</span> <span class="token punctuation">{</span>
- template<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`<div>{{ count }}</div>`</span></span><span class="token punctuation">,</span>
- computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- count <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
- <span class="token keyword">return</span> store<span class="token punctuation">.</span>state<span class="token punctuation">.</span>count
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <p><code>store.state.count</code>가 변경되면 계산된 속성이 다시 변경되고 관련 DOM 업데이트가 트리거됩니다.</p>
- <p>그러나 이 패턴은 컴포넌트가 전역 저장소 단독 항목에 의존하게합니다. 모듈 시스템을 사용할 때는 저장소 상태를 사용하는 모든 컴포넌트에서 저장소를 가져와야하며 컴포넌트를 테스트 할 때는 가짜데이터가 필요합니다.</p>
- <p>Vuex는 <code>store</code> 옵션(<code>Vue.use(Vuex)</code>에 의해 가능)으로 루트 컴포넌트의 모든 자식 컴포넌트에 저장소를 "주입"하는 메커니즘을 제공합니다.</p>
- <pre class="language-"><code class="lang-js"><span class="token keyword">const</span> app <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Vue</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
- el<span class="token punctuation">:</span> <span class="token string">'#app'</span><span class="token punctuation">,</span>
- <span class="token comment" spellcheck="true">// "store" 옵션을 사용하여 저장소를 제공하십시오.</span>
- <span class="token comment" spellcheck="true">// 그러면 모든 하위 컴포넌트에 저장소 인스턴스가 삽입됩니다.</span>
- store<span class="token punctuation">,</span>
- components<span class="token punctuation">:</span> <span class="token punctuation">{</span> Counter <span class="token punctuation">}</span><span class="token punctuation">,</span>
- template<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`
- <div class="app">
- <counter></counter>
- </div>
- `</span></span>
- <span class="token punctuation">}</span><span class="token punctuation">)</span>
- </code></pre>
- <p>루트 인스턴스에 <code>store</code> 옵션을 제공함으로써 저장소는 루트의 모든 하위 컴포넌트에 주입되고 <code>this.$store</code>로 사용할 수 있습니다. <code>Counter</code> 구현을 수정해야 합니다.</p>
- <pre class="language-"><code class="lang-js"><span class="token keyword">const</span> Counter <span class="token operator">=</span> <span class="token punctuation">{</span>
- template<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`<div>{{ count }}</div>`</span></span><span class="token punctuation">,</span>
- computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- count <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
- <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>$store<span class="token punctuation">.</span>state<span class="token punctuation">.</span>count
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <h3 id="mapstate-헬퍼"><code>mapState</code> 헬퍼</h3>
- <p>컴포넌트가 여러 저장소 상태 속성이나 getter를 사용해야하는 경우 계산된 속성을 모두 선언하면 반복적이고 장황해집니다. 이를 처리하기 위해 우리는 계산된 getter 함수를 생성하는 <code>mapState</code> 헬퍼를 사용하여 키 입력을 줄일 수 있습니다.</p>
- <pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// 독립 실행 형 빌드에서 헬퍼가 Vuex.mapState로 노출됩니다.</span>
- <span class="token keyword">import</span> <span class="token punctuation">{</span> mapState <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'vuex'</span>
- <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// ...</span>
- computed<span class="token punctuation">:</span> <span class="token function">mapState</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// 화살표 함수는 코드를 매우 간결하게 만들어 줍니다!</span>
- count<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">></span> state<span class="token punctuation">.</span>count<span class="token punctuation">,</span>
- <span class="token comment" spellcheck="true">// 문자열 값 'count'를 전달하는 것은 `state => state.count`와 같습니다.</span>
- countAlias<span class="token punctuation">:</span> <span class="token string">'count'</span><span class="token punctuation">,</span>
- <span class="token comment" spellcheck="true">// `this`를 사용하여 로컬 상태에 액세스하려면 일반적인 함수를 사용해야합니다</span>
- countPlusLocalState <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
- <span class="token keyword">return</span> state<span class="token punctuation">.</span>count <span class="token operator">+</span> <span class="token keyword">this</span><span class="token punctuation">.</span>localCount
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span><span class="token punctuation">)</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <p>또한 매핑 된 계산된 속성의 이름이 상태 하위 트리 이름과 같을 때 문자열 배열을 <code>mapState</code>에 전달할 수 있습니다.</p>
- <pre class="language-"><code class="lang-js">computed<span class="token punctuation">:</span> <span class="token function">mapState</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
- <span class="token comment" spellcheck="true">// this.count를 store.state.count에 매핑 합니다.</span>
- <span class="token string">'count'</span>
- <span class="token punctuation">]</span><span class="token punctuation">)</span>
- </code></pre>
- <h3 id="객체-전개-연산자-object-spread-operator">객체 전개 연산자 (Object Spread Operator)</h3>
- <p><code>mapState</code>는 객체를 반환합니다. 다른 로컬 영역의 계산된 속성과 함께 사용하려면 어떻게 해야 하나요? 일반적으로, 최종 객체를 <code>computed</code>에 전달할 수 있도록 여러 객체를 하나로 병합하는 유틸리티를 사용해야합니다. 그러나 (3 단계 ECMAScript 스펙) <a href="https://github.com/sebmarkbage/ecmascript-rest-spread" target="_blank">객체 전개 연산자 (Object Spread Operator)</a>을 사용하면 문법을 매우 단순화 할 수 있습니다.</p>
- <pre class="language-"><code class="lang-js">computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- localComputed <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment" spellcheck="true">/* ... */</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
- <span class="token comment" spellcheck="true">// 이것을 객체 전개 연산자(Object Spread Operator)를 사용하여 외부 객체에 추가 하십시오.</span>
- <span class="token operator">...</span><span class="token function">mapState</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// ...</span>
- <span class="token punctuation">}</span><span class="token punctuation">)</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <h3 id="컴포넌트에는-여전히-로컬-상태가-있을-수-있습니다">컴포넌트에는 여전히 로컬 상태가 있을 수 있습니다.</h3>
- <p>Vuex를 사용한다고해서 Vuex에 <strong>모든</strong> 상태를 넣어야하는 것은 아닙니다. Vuex에 더 많은 상태를 넣으면 상태 변이가 더 명확하고 디버그 가능하지만, 때로는 코드를 보다 장황하고 간접적으로 만들 수 있습니다. 상태 조각이 단일 컴포넌트에 엄격하게 속한 경우 로컬 상태로 남겨 둘 수 있습니다. 기회비용을 판단하고 앱의 개발 요구에 맞는 결정을 내려야 합니다.</p>
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