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        <a href="." >Getter</a>
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                                <h1 id="getter">Getter</h1>
<p>&#x6709;&#x65F6;&#x5019;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x4ECE; store &#x4E2D;&#x7684; state &#x4E2D;&#x6D3E;&#x751F;&#x51FA;&#x4E00;&#x4E9B;&#x72B6;&#x6001;&#xFF0C;&#x4F8B;&#x5982;&#x5BF9;&#x5217;&#x8868;&#x8FDB;&#x884C;&#x8FC7;&#x6EE4;&#x5E76;&#x8BA1;&#x6570;&#xFF1A;</p>
<pre class="language-"><code class="lang-js">computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  doneTodosCount <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>todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>todo <span class="token operator">=</span><span class="token operator">&gt;</span> todo<span class="token punctuation">.</span>done<span class="token punctuation">)</span><span class="token punctuation">.</span>length
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x5982;&#x679C;&#x6709;&#x591A;&#x4E2A;&#x7EC4;&#x4EF6;&#x9700;&#x8981;&#x7528;&#x5230;&#x6B64;&#x5C5E;&#x6027;&#xFF0C;&#x6211;&#x4EEC;&#x8981;&#x4E48;&#x590D;&#x5236;&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x6216;&#x8005;&#x62BD;&#x53D6;&#x5230;&#x4E00;&#x4E2A;&#x5171;&#x4EAB;&#x51FD;&#x6570;&#x7136;&#x540E;&#x5728;&#x591A;&#x5904;&#x5BFC;&#x5165;&#x5B83;&#x2014;&#x2014;&#x65E0;&#x8BBA;&#x54EA;&#x79CD;&#x65B9;&#x5F0F;&#x90FD;&#x4E0D;&#x662F;&#x5F88;&#x7406;&#x60F3;&#x3002;</p>
<p>Vuex &#x5141;&#x8BB8;&#x6211;&#x4EEC;&#x5728; store &#x4E2D;&#x5B9A;&#x4E49;&#x201C;getter&#x201D;&#xFF08;&#x53EF;&#x4EE5;&#x8BA4;&#x4E3A;&#x662F; store &#x7684;&#x8BA1;&#x7B97;&#x5C5E;&#x6027;&#xFF09;&#x3002;&#x5C31;&#x50CF;&#x8BA1;&#x7B97;&#x5C5E;&#x6027;&#x4E00;&#x6837;&#xFF0C;getter &#x7684;&#x8FD4;&#x56DE;&#x503C;&#x4F1A;&#x6839;&#x636E;&#x5B83;&#x7684;&#x4F9D;&#x8D56;&#x88AB;&#x7F13;&#x5B58;&#x8D77;&#x6765;&#xFF0C;&#x4E14;&#x53EA;&#x6709;&#x5F53;&#x5B83;&#x7684;&#x4F9D;&#x8D56;&#x503C;&#x53D1;&#x751F;&#x4E86;&#x6539;&#x53D8;&#x624D;&#x4F1A;&#x88AB;&#x91CD;&#x65B0;&#x8BA1;&#x7B97;&#x3002;</p>
<p>Getter &#x63A5;&#x53D7; state &#x4F5C;&#x4E3A;&#x5176;&#x7B2C;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#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>
    todos<span class="token punctuation">:</span> <span class="token punctuation">[</span>
      <span class="token punctuation">{</span> id<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> text<span class="token punctuation">:</span> <span class="token string">&apos;...&apos;</span><span class="token punctuation">,</span> done<span class="token punctuation">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token punctuation">{</span> id<span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">,</span> text<span class="token punctuation">:</span> <span class="token string">&apos;...&apos;</span><span class="token punctuation">,</span> done<span class="token punctuation">:</span> <span class="token boolean">false</span> <span class="token punctuation">}</span>
    <span class="token punctuation">]</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    doneTodos<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> state<span class="token punctuation">.</span>todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>todo <span class="token operator">=</span><span class="token operator">&gt;</span> todo<span class="token punctuation">.</span>done<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>
<h3 id="&#x901A;&#x8FC7;&#x5C5E;&#x6027;&#x8BBF;&#x95EE;">&#x901A;&#x8FC7;&#x5C5E;&#x6027;&#x8BBF;&#x95EE;</h3>
<p>Getter &#x4F1A;&#x66B4;&#x9732;&#x4E3A; <code>store.getters</code> &#x5BF9;&#x8C61;&#xFF0C;&#x4F60;&#x53EF;&#x4EE5;&#x4EE5;&#x5C5E;&#x6027;&#x7684;&#x5F62;&#x5F0F;&#x8BBF;&#x95EE;&#x8FD9;&#x4E9B;&#x503C;&#xFF1A;</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span>getters<span class="token punctuation">.</span>doneTodos <span class="token comment" spellcheck="true">// -&gt; [{ id: 1, text: &apos;...&apos;, done: true }]</span>
</code></pre>
<p>Getter &#x4E5F;&#x53EF;&#x4EE5;&#x63A5;&#x53D7;&#x5176;&#x4ED6; getter &#x4F5C;&#x4E3A;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#xFF1A;</p>
<pre class="language-"><code class="lang-js">getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  <span class="token comment" spellcheck="true">// ...</span>
  doneTodosCount<span class="token punctuation">:</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> getters<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> getters<span class="token punctuation">.</span>doneTodos<span class="token punctuation">.</span>length
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span>getters<span class="token punctuation">.</span>doneTodosCount <span class="token comment" spellcheck="true">// -&gt; 1</span>
</code></pre>
<p>&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x5F88;&#x5BB9;&#x6613;&#x5730;&#x5728;&#x4EFB;&#x4F55;&#x7EC4;&#x4EF6;&#x4E2D;&#x4F7F;&#x7528;&#x5B83;&#xFF1A;</p>
<pre class="language-"><code class="lang-js">computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  doneTodosCount <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>getters<span class="token punctuation">.</span>doneTodosCount
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x6CE8;&#x610F;&#xFF0C;getter &#x5728;&#x901A;&#x8FC7;&#x5C5E;&#x6027;&#x8BBF;&#x95EE;&#x65F6;&#x662F;&#x4F5C;&#x4E3A; Vue &#x7684;&#x54CD;&#x5E94;&#x5F0F;&#x7CFB;&#x7EDF;&#x7684;&#x4E00;&#x90E8;&#x5206;&#x7F13;&#x5B58;&#x5176;&#x4E2D;&#x7684;&#x3002;</p>
<h3 id="&#x901A;&#x8FC7;&#x65B9;&#x6CD5;&#x8BBF;&#x95EE;">&#x901A;&#x8FC7;&#x65B9;&#x6CD5;&#x8BBF;&#x95EE;</h3>
<p>&#x4F60;&#x4E5F;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x8BA9; getter &#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x6765;&#x5B9E;&#x73B0;&#x7ED9; getter &#x4F20;&#x53C2;&#x3002;&#x5728;&#x4F60;&#x5BF9; store &#x91CC;&#x7684;&#x6570;&#x7EC4;&#x8FDB;&#x884C;&#x67E5;&#x8BE2;&#x65F6;&#x975E;&#x5E38;&#x6709;&#x7528;&#x3002;</p>
<pre class="language-"><code class="lang-js">getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  <span class="token comment" spellcheck="true">// ...</span>
  getTodoById<span class="token punctuation">:</span> <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">(</span>id<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> state<span class="token punctuation">.</span>todos<span class="token punctuation">.</span><span class="token function">find</span><span class="token punctuation">(</span>todo <span class="token operator">=</span><span class="token operator">&gt;</span> todo<span class="token punctuation">.</span>id <span class="token operator">===</span> id<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span>getters<span class="token punctuation">.</span><span class="token function">getTodoById</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span> <span class="token comment" spellcheck="true">// -&gt; { id: 2, text: &apos;...&apos;, done: false }</span>
</code></pre>
<p>&#x6CE8;&#x610F;&#xFF0C;getter &#x5728;&#x901A;&#x8FC7;&#x65B9;&#x6CD5;&#x8BBF;&#x95EE;&#x65F6;&#xFF0C;&#x6BCF;&#x6B21;&#x90FD;&#x4F1A;&#x53BB;&#x8FDB;&#x884C;&#x8C03;&#x7528;&#xFF0C;&#x800C;&#x4E0D;&#x4F1A;&#x7F13;&#x5B58;&#x7ED3;&#x679C;&#x3002;</p>
<h3 id="mapgetters-&#x8F85;&#x52A9;&#x51FD;&#x6570;"><code>mapGetters</code> &#x8F85;&#x52A9;&#x51FD;&#x6570;</h3>
<p><code>mapGetters</code> &#x8F85;&#x52A9;&#x51FD;&#x6570;&#x4EC5;&#x4EC5;&#x662F;&#x5C06; store &#x4E2D;&#x7684; getter &#x6620;&#x5C04;&#x5230;&#x5C40;&#x90E8;&#x8BA1;&#x7B97;&#x5C5E;&#x6027;&#xFF1A;</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> mapGetters <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>
  computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  <span class="token comment" spellcheck="true">// &#x4F7F;&#x7528;&#x5BF9;&#x8C61;&#x5C55;&#x5F00;&#x8FD0;&#x7B97;&#x7B26;&#x5C06; getter &#x6DF7;&#x5165; computed &#x5BF9;&#x8C61;&#x4E2D;</span>
    <span class="token operator">...</span><span class="token function">mapGetters</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
      <span class="token string">&apos;doneTodosCount&apos;</span><span class="token punctuation">,</span>
      <span class="token string">&apos;anotherGetter&apos;</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>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x5982;&#x679C;&#x4F60;&#x60F3;&#x5C06;&#x4E00;&#x4E2A; getter &#x5C5E;&#x6027;&#x53E6;&#x53D6;&#x4E00;&#x4E2A;&#x540D;&#x5B57;&#xFF0C;&#x4F7F;&#x7528;&#x5BF9;&#x8C61;&#x5F62;&#x5F0F;&#xFF1A;</p>
<pre class="language-"><code class="lang-js"><span class="token function">mapGetters</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  <span class="token comment" spellcheck="true">// &#x6620;&#x5C04; `this.doneCount` &#x4E3A; `store.getters.doneTodosCount`</span>
  doneCount<span class="token punctuation">:</span> <span class="token string">&apos;doneTodosCount&apos;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>

                                
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