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    <h1>
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        <a href="." >Action</a>
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                                <h1 id="action">Action</h1>
<p>Action &#x7C7B;&#x4F3C;&#x4E8E; mutation&#xFF0C;&#x4E0D;&#x540C;&#x5728;&#x4E8E;&#xFF1A;</p>
<ul>
<li>Action &#x63D0;&#x4EA4;&#x7684;&#x662F; mutation&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x76F4;&#x63A5;&#x53D8;&#x66F4;&#x72B6;&#x6001;&#x3002;</li>
<li>Action &#x53EF;&#x4EE5;&#x5305;&#x542B;&#x4EFB;&#x610F;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x3002;</li>
</ul>
<p>&#x8BA9;&#x6211;&#x4EEC;&#x6765;&#x6CE8;&#x518C;&#x4E00;&#x4E2A;&#x7B80;&#x5355;&#x7684; action&#xFF1A;</p>
<pre class="language-"><code class="lang-js"><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>
  actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    increment <span class="token punctuation">(</span>context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      context<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>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>Action &#x51FD;&#x6570;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x4E0E; store &#x5B9E;&#x4F8B;&#x5177;&#x6709;&#x76F8;&#x540C;&#x65B9;&#x6CD5;&#x548C;&#x5C5E;&#x6027;&#x7684; context &#x5BF9;&#x8C61;&#xFF0C;&#x56E0;&#x6B64;&#x4F60;&#x53EF;&#x4EE5;&#x8C03;&#x7528; <code>context.commit</code> &#x63D0;&#x4EA4;&#x4E00;&#x4E2A; mutation&#xFF0C;&#x6216;&#x8005;&#x901A;&#x8FC7; <code>context.state</code> &#x548C; <code>context.getters</code> &#x6765;&#x83B7;&#x53D6; state &#x548C; getters&#x3002;&#x5F53;&#x6211;&#x4EEC;&#x5728;&#x4E4B;&#x540E;&#x4ECB;&#x7ECD;&#x5230; <a href="modules.html">Modules</a> &#x65F6;&#xFF0C;&#x4F60;&#x5C31;&#x77E5;&#x9053; context &#x5BF9;&#x8C61;&#x4E3A;&#x4EC0;&#x4E48;&#x4E0D;&#x662F; store &#x5B9E;&#x4F8B;&#x672C;&#x8EAB;&#x4E86;&#x3002;</p>
<p>&#x5B9E;&#x8DF5;&#x4E2D;&#xFF0C;&#x6211;&#x4EEC;&#x4F1A;&#x7ECF;&#x5E38;&#x7528;&#x5230; ES2015 &#x7684; <a href="https://github.com/lukehoban/es6features#destructuring" target="_blank">&#x53C2;&#x6570;&#x89E3;&#x6784;</a> &#x6765;&#x7B80;&#x5316;&#x4EE3;&#x7801;&#xFF08;&#x7279;&#x522B;&#x662F;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x8C03;&#x7528; <code>commit</code> &#x5F88;&#x591A;&#x6B21;&#x7684;&#x65F6;&#x5019;&#xFF09;&#xFF1A;</p>
<pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  increment <span class="token punctuation">(</span><span class="token punctuation">{</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <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>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="&#x5206;&#x53D1;-action">&#x5206;&#x53D1; Action</h3>
<p>Action &#x901A;&#x8FC7; <code>store.dispatch</code> &#x65B9;&#x6CD5;&#x89E6;&#x53D1;&#xFF1A;</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span>
</code></pre>
<p>&#x4E4D;&#x4E00;&#x773C;&#x770B;&#x4E0A;&#x53BB;&#x611F;&#x89C9;&#x591A;&#x6B64;&#x4E00;&#x4E3E;&#xFF0C;&#x6211;&#x4EEC;&#x76F4;&#x63A5;&#x5206;&#x53D1; mutation &#x5C82;&#x4E0D;&#x66F4;&#x65B9;&#x4FBF;&#xFF1F;&#x5B9E;&#x9645;&#x4E0A;&#x5E76;&#x975E;&#x5982;&#x6B64;&#xFF0C;&#x8FD8;&#x8BB0;&#x5F97; <strong>mutation &#x5FC5;&#x987B;&#x540C;&#x6B65;&#x6267;&#x884C;</strong>&#x8FD9;&#x4E2A;&#x9650;&#x5236;&#x4E48;&#xFF1F;Action &#x5C31;&#x4E0D;&#x53D7;&#x7EA6;&#x675F;&#xFF01;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x5728; action &#x5185;&#x90E8;&#x6267;&#x884C;<strong>&#x5F02;&#x6B65;</strong>&#x64CD;&#x4F5C;&#xFF1A;</p>
<pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  incrementAsync <span class="token punctuation">(</span><span class="token punctuation">{</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <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>
    <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>Actions &#x652F;&#x6301;&#x540C;&#x6837;&#x7684;&#x8F7D;&#x8377;&#x65B9;&#x5F0F;&#x548C;&#x5BF9;&#x8C61;&#x65B9;&#x5F0F;&#x8FDB;&#x884C;&#x5206;&#x53D1;&#xFF1A;</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// &#x4EE5;&#x8F7D;&#x8377;&#x5F62;&#x5F0F;&#x5206;&#x53D1;</span>
store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">&apos;incrementAsync&apos;</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
  amount<span class="token punctuation">:</span> <span class="token number">10</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token comment" spellcheck="true">// &#x4EE5;&#x5BF9;&#x8C61;&#x5F62;&#x5F0F;&#x5206;&#x53D1;</span>
store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  type<span class="token punctuation">:</span> <span class="token string">&apos;incrementAsync&apos;</span><span class="token punctuation">,</span>
  amount<span class="token punctuation">:</span> <span class="token number">10</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>&#x6765;&#x770B;&#x4E00;&#x4E2A;&#x66F4;&#x52A0;&#x5B9E;&#x9645;&#x7684;&#x8D2D;&#x7269;&#x8F66;&#x793A;&#x4F8B;&#xFF0C;&#x6D89;&#x53CA;&#x5230;<strong>&#x8C03;&#x7528;&#x5F02;&#x6B65; API</strong> &#x548C;<strong>&#x5206;&#x53D1;&#x591A;&#x91CD; mutation</strong>&#xFF1A;</p>
<pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  checkout <span class="token punctuation">(</span><span class="token punctuation">{</span> commit<span class="token punctuation">,</span> state <span class="token punctuation">}</span><span class="token punctuation">,</span> products<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// &#x628A;&#x5F53;&#x524D;&#x8D2D;&#x7269;&#x8F66;&#x7684;&#x7269;&#x54C1;&#x5907;&#x4EFD;&#x8D77;&#x6765;</span>
    <span class="token keyword">const</span> savedCartItems <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token operator">...</span>state<span class="token punctuation">.</span>cart<span class="token punctuation">.</span>added<span class="token punctuation">]</span>
    <span class="token comment" spellcheck="true">// &#x53D1;&#x51FA;&#x7ED3;&#x8D26;&#x8BF7;&#x6C42;&#xFF0C;&#x7136;&#x540E;&#x4E50;&#x89C2;&#x5730;&#x6E05;&#x7A7A;&#x8D2D;&#x7269;&#x8F66;</span>
    <span class="token function">commit</span><span class="token punctuation">(</span>types<span class="token punctuation">.</span>CHECKOUT_REQUEST<span class="token punctuation">)</span>
    <span class="token comment" spellcheck="true">// &#x8D2D;&#x7269; API &#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x6210;&#x529F;&#x56DE;&#x8C03;&#x548C;&#x4E00;&#x4E2A;&#x5931;&#x8D25;&#x56DE;&#x8C03;</span>
    shop<span class="token punctuation">.</span><span class="token function">buyProducts</span><span class="token punctuation">(</span>
      products<span class="token punctuation">,</span>
      <span class="token comment" spellcheck="true">// &#x6210;&#x529F;&#x64CD;&#x4F5C;</span>
      <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">commit</span><span class="token punctuation">(</span>types<span class="token punctuation">.</span>CHECKOUT_SUCCESS<span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token comment" spellcheck="true">// &#x5931;&#x8D25;&#x64CD;&#x4F5C;</span>
      <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">commit</span><span class="token punctuation">(</span>types<span class="token punctuation">.</span>CHECKOUT_FAILURE<span class="token punctuation">,</span> savedCartItems<span class="token punctuation">)</span>
    <span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x6CE8;&#x610F;&#x6211;&#x4EEC;&#x6B63;&#x5728;&#x8FDB;&#x884C;&#x4E00;&#x7CFB;&#x5217;&#x7684;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#xFF0C;&#x5E76;&#x4E14;&#x901A;&#x8FC7;&#x63D0;&#x4EA4; mutation &#x6765;&#x8BB0;&#x5F55; action &#x4EA7;&#x751F;&#x7684;&#x526F;&#x4F5C;&#x7528;&#xFF08;&#x5373;&#x72B6;&#x6001;&#x53D8;&#x66F4;&#xFF09;&#x3002;</p>
<h3 id="&#x5728;&#x7EC4;&#x4EF6;&#x4E2D;&#x5206;&#x53D1;-action">&#x5728;&#x7EC4;&#x4EF6;&#x4E2D;&#x5206;&#x53D1; Action</h3>
<p>&#x4F60;&#x5728;&#x7EC4;&#x4EF6;&#x4E2D;&#x4F7F;&#x7528; <code>this.$store.dispatch(&apos;xxx&apos;)</code> &#x5206;&#x53D1; action&#xFF0C;&#x6216;&#x8005;&#x4F7F;&#x7528; <code>mapActions</code> &#x8F85;&#x52A9;&#x51FD;&#x6570;&#x5C06;&#x7EC4;&#x4EF6;&#x7684; methods &#x6620;&#x5C04;&#x4E3A; <code>store.dispatch</code> &#x8C03;&#x7528;&#xFF08;&#x9700;&#x8981;&#x5148;&#x5728;&#x6839;&#x8282;&#x70B9;&#x6CE8;&#x5165; <code>store</code>&#xFF09;&#xFF1A;</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> mapActions <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;vuex&apos;</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>
  methods<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    <span class="token operator">...</span><span class="token function">mapActions</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
      <span class="token string">&apos;increment&apos;</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// &#x5C06; `this.increment()` &#x6620;&#x5C04;&#x4E3A; `this.$store.dispatch(&apos;increment&apos;)`</span>

      <span class="token comment" spellcheck="true">// `mapActions` &#x4E5F;&#x652F;&#x6301;&#x8F7D;&#x8377;&#xFF1A;</span>
      <span class="token string">&apos;incrementBy&apos;</span> <span class="token comment" spellcheck="true">// &#x5C06; `this.incrementBy(amount)` &#x6620;&#x5C04;&#x4E3A; `this.$store.dispatch(&apos;incrementBy&apos;, amount)`</span>
    <span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token operator">...</span><span class="token function">mapActions</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
      add<span class="token punctuation">:</span> <span class="token string">&apos;increment&apos;</span> <span class="token comment" spellcheck="true">// &#x5C06; `this.add()` &#x6620;&#x5C04;&#x4E3A; `this.$store.dispatch(&apos;increment&apos;)`</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="&#x7EC4;&#x5408;-action">&#x7EC4;&#x5408; Action</h3>
<p>Action &#x901A;&#x5E38;&#x662F;&#x5F02;&#x6B65;&#x7684;&#xFF0C;&#x90A3;&#x4E48;&#x5982;&#x4F55;&#x77E5;&#x9053; action &#x4EC0;&#x4E48;&#x65F6;&#x5019;&#x7ED3;&#x675F;&#x5462;&#xFF1F;&#x66F4;&#x91CD;&#x8981;&#x7684;&#x662F;&#xFF0C;&#x6211;&#x4EEC;&#x5982;&#x4F55;&#x624D;&#x80FD;&#x7EC4;&#x5408;&#x591A;&#x4E2A; action&#xFF0C;&#x4EE5;&#x5904;&#x7406;&#x66F4;&#x52A0;&#x590D;&#x6742;&#x7684;&#x5F02;&#x6B65;&#x6D41;&#x7A0B;&#xFF1F;</p>
<p>&#x9996;&#x5148;&#xFF0C;&#x4F60;&#x9700;&#x8981;&#x660E;&#x767D; <code>store.dispatch</code> &#x53EF;&#x4EE5;&#x5904;&#x7406;&#x88AB;&#x89E6;&#x53D1;&#x7684; action &#x7684;&#x5904;&#x7406;&#x51FD;&#x6570;&#x8FD4;&#x56DE;&#x7684; Promise&#xFF0C;&#x5E76;&#x4E14; <code>store.dispatch</code> &#x4ECD;&#x65E7;&#x8FD4;&#x56DE; Promise&#xFF1A;</p>
<pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  actionA <span class="token punctuation">(</span><span class="token punctuation">{</span> commit <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">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span>resolve<span class="token punctuation">,</span> reject<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
        <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;someMutation&apos;</span><span class="token punctuation">)</span>
        <span class="token function">resolve</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x73B0;&#x5728;&#x4F60;&#x53EF;&#x4EE5;&#xFF1A;</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">&apos;actionA&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token comment" spellcheck="true">// ...</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>&#x5728;&#x53E6;&#x5916;&#x4E00;&#x4E2A; action &#x4E2D;&#x4E5F;&#x53EF;&#x4EE5;&#xFF1A;</p>
<pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  <span class="token comment" spellcheck="true">// ...</span>
  actionB <span class="token punctuation">(</span><span class="token punctuation">{</span> dispatch<span class="token punctuation">,</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">&apos;actionA&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;someOtherMutation&apos;</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x6700;&#x540E;&#xFF0C;&#x5982;&#x679C;&#x6211;&#x4EEC;&#x5229;&#x7528; <a href="https://tc39.github.io/ecmascript-asyncawait/" target="_blank">async / await</a>&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x5982;&#x4E0B;&#x7EC4;&#x5408; action&#xFF1A;</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// &#x5047;&#x8BBE; getData() &#x548C; getOtherData() &#x8FD4;&#x56DE;&#x7684;&#x662F; Promise</span>

actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  <span class="token keyword">async</span> actionA <span class="token punctuation">(</span><span class="token punctuation">{</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;gotData&apos;</span><span class="token punctuation">,</span> <span class="token keyword">await</span> <span class="token function">getData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  <span class="token keyword">async</span> actionB <span class="token punctuation">(</span><span class="token punctuation">{</span> dispatch<span class="token punctuation">,</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">await</span> <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">&apos;actionA&apos;</span><span class="token punctuation">)</span> <span class="token comment" spellcheck="true">// &#x7B49;&#x5F85; actionA &#x5B8C;&#x6210;</span>
    <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;gotOtherData&apos;</span><span class="token punctuation">,</span> <span class="token keyword">await</span> <span class="token function">getOtherData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>&#x4E00;&#x4E2A; <code>store.dispatch</code> &#x5728;&#x4E0D;&#x540C;&#x6A21;&#x5757;&#x4E2D;&#x53EF;&#x4EE5;&#x89E6;&#x53D1;&#x591A;&#x4E2A; action &#x51FD;&#x6570;&#x3002;&#x5728;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x53EA;&#x6709;&#x5F53;&#x6240;&#x6709;&#x89E6;&#x53D1;&#x51FD;&#x6570;&#x5B8C;&#x6210;&#x540E;&#xFF0C;&#x8FD4;&#x56DE;&#x7684; Promise &#x624D;&#x4F1A;&#x6267;&#x884C;&#x3002;</p>
</blockquote>

                                
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