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                    Pour commencer
            
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        <a href="." >Pour commencer</a>
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                                <h1 id="pour-commencer">Pour commencer</h1>
<p>Au c&#x153;ur de chaque application Vuex, il y a la <strong>zone de stockage (&#xAB; store &#xBB;)</strong>. Un &#xAB; store &#xBB; est tout simplement un conteneur avec l&apos;<strong>&#xE9;tat (&#xAB; state &#xBB;)</strong> de votre application. Il y a deux choses qui diff&#xE9;rencient un store Vuex d&apos;un simple objet global :</p>
<ol>
<li><p>Les stores Vuex sont r&#xE9;actifs. Quand les composants Vue y r&#xE9;cup&#xE8;rent l&apos;&#xE9;tat, ils se mettront &#xE0; jour de fa&#xE7;on r&#xE9;active et efficace si l&apos;&#xE9;tat du store a chang&#xE9;.</p>
</li>
<li><p>Vous ne pouvez pas muter directement l&apos;&#xE9;tat du store. La seule fa&#xE7;on de modifier l&apos;&#xE9;tat d&apos;un store est d&apos;<strong>acter (&#xAB; commit &#xBB;)</strong> explicitement des <strong>mutations</strong>. Cela assure que chaque &#xE9;tat laisse un enregistrement tra&#xE7;able, et permet &#xE0; des outils de nous aider &#xE0; mieux appr&#xE9;hender nos applications.</p>
</li>
</ol>
<h3 id="le-store-le-plus-simple">Le store le plus simple</h3>
<blockquote>
<p><strong>NOTE:</strong> Nous allons utiliser la syntaxe ES2015 dans les exemples de code pour le reste de la documentation. Si vous ne vous &#xEA;tes pas encore pench&#xE9; dessus, <a href="https://babeljs.io/docs/learn-es2015/" target="_blank">vous devriez</a> !</p>
</blockquote>
<p>Apr&#xE8;s <a href="installation.html">avoir install&#xE9;</a> Vuex, nous allons cr&#xE9;er un store. C&apos;est assez simple ; d&#xE9;finissez juste un objet d&apos;&#xE9;tat initial et quelques mutations :</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// Assurez vous d&apos;appeler `Vue.use(Vuex)` en premier lieu si vous utilisez un syst&#xE8;me de module</span>

<span class="token keyword">const</span> store <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Vuex<span class="token punctuation">.</span>Store</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  state<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    count<span class="token punctuation">:</span> <span class="token number">0</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    increment <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      state<span class="token punctuation">.</span>count<span class="token operator">++</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>Maintenant, vous pouvez acc&#xE9;der &#xE0; l&apos;objet d&apos;&#xE9;tat avec <code>store.state</code>, et d&#xE9;clencher un changement d&apos;&#xE9;tat avec la m&#xE9;thode <code>store.commit</code> :</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span>

console<span class="token punctuation">.</span><span class="token function">log</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 comment" spellcheck="true">// -&gt; 1</span>
</code></pre>
<p>Encore une fois, la raison pour laquelle nous actons une mutation au lieu de modifier <code>store.state.count</code> directement, c&apos;est parce que nous voulons le tracer explicitement. Cette simple convention rend votre intention plus explicite, ainsi vous pouvez raisonner plus facilement les changements d&apos;&#xE9;tat en lisant votre code. De plus, cela nous donne l&apos;opportunit&#xE9; d&apos;impl&#xE9;menter des outils qui peuvent enregistrer chaque mutation, prendre des instantan&#xE9;s de l&apos;&#xE9;tat, ou m&#xEA;me proc&#xE9;der &#xE0; de la visualisation d&apos;&#xE9;tat dans le temps.</p>
<p>Utiliser l&apos;&#xE9;tat du store dans un composant implique simplement de retourner l&apos;&#xE9;tat dans une <em>propri&#xE9;t&#xE9; calcul&#xE9;e</em>, car l&apos;&#xE9;tat du store est r&#xE9;actif. D&#xE9;clencher des changements signifie simplement d&apos;acter des mutations dans les m&#xE9;thodes du composant.</p>
<p>Voici un exemple de l&apos;<a href="https://jsfiddle.net/n9jmu5v7/1269/" target="_blank">application de comptage Vuex la plus basique</a>.</p>
<p>Ensuite, nous allons examiner chaque concept de base plus en d&#xE9;tails, et commen&#xE7;ons avec l&apos;<a href="state.html">&#xC9;tat</a>.</p>

                                
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