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a utilies library reduce boilerplate for vuex
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Introduction
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安装
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Vuex 是什么？
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开始
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核心概念
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State
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Getter
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Mutation
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Action
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Module
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<a href="." >开始</a>
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<h1 id="开始">开始</h1>
<p>每一个 Vuex 应用的核心就是 store（仓库）。“store”基本上就是一个容器，它包含着你的应用中大部分的<strong>状态 (state)</strong>。Vuex 和单纯的全局对象有以下两点不同：</p>
<ol>
<li><p>Vuex 的状态存储是响应式的。当 Vue 组件从 store 中读取状态的时候，若 store 中的状态发生变化，那么相应的组件也会相应地得到高效更新。</p>
</li>
<li><p>你不能直接改变 store 中的状态。改变 store 中的状态的唯一途径就是显式地<strong>提交 (commit) mutation</strong>。这样使得我们可以方便地跟踪每一个状态的变化，从而让我们能够实现一些工具帮助我们更好地了解我们的应用。</p>
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<h3 id="最简单的-store">最简单的 Store</h3>
<blockquote>
<p><strong>提示：</strong>我们将在后续的文档示例代码中使用 ES2015 语法。如果你还没能掌握 ES2015，<a href="https://babeljs.io/docs/learn-es2015/" target="_blank">你得抓紧了</a>！</p>
</blockquote>
<p><a href="installation.html">安装</a> Vuex 之后，让我们来创建一个 store。创建过程直截了当——仅需要提供一个初始 state 对象和一些 mutation：</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// 如果在模块化构建系统中，请确保在开头调用了 Vue.use(Vuex)</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>现在，你可以通过 <code>store.state</code> 来获取状态对象，以及通过 <code>store.commit</code> 方法触发状态变更：</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">'increment'</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">// -> 1</span>
</code></pre>
<p>再次强调，我们通过提交 mutation 的方式，而非直接改变 <code>store.state.count</code>，是因为我们想要更明确地追踪到状态的变化。这个简单的约定能够让你的意图更加明显，这样你在阅读代码的时候能更容易地解读应用内部的状态改变。此外，这样也让我们有机会去实现一些能记录每次状态改变，保存状态快照的调试工具。有了它，我们甚至可以实现如时间穿梭般的调试体验。</p>
<p>由于 store 中的状态是响应式的，在组件中调用 store 中的状态简单到仅需要在计算属性中返回即可。触发变化也仅仅是在组件的 methods 中提交 mutation。</p>
<p>这是一个<a href="https://jsfiddle.net/n9jmu5v7/1269/" target="_blank">最基本的 Vuex 记数应用</a>示例。</p>
<p>接下来，我们将会更深入地探讨一些核心概念。让我们先从 <a href="state.html">State</a> 概念开始。</p>
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