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                                <h1 id="state">State</h1>
<h3 id="&#x5355;&#x4E00;&#x72B6;&#x6001;&#x6811;">&#x5355;&#x4E00;&#x72B6;&#x6001;&#x6811;</h3>
<p>Vuex &#x4F7F;&#x7528;<strong>&#x5355;&#x4E00;&#x72B6;&#x6001;&#x6811;</strong>&#x2014;&#x2014;&#x662F;&#x7684;&#xFF0C;&#x7528;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x5C31;&#x5305;&#x542B;&#x4E86;&#x5168;&#x90E8;&#x7684;&#x5E94;&#x7528;&#x5C42;&#x7EA7;&#x72B6;&#x6001;&#x3002;&#x81F3;&#x6B64;&#x5B83;&#x4FBF;&#x4F5C;&#x4E3A;&#x4E00;&#x4E2A;&#x201C;&#x552F;&#x4E00;&#x6570;&#x636E;&#x6E90; (<a href="https://en.wikipedia.org/wiki/Single_source_of_truth" target="_blank">SSOT</a>)&#x201D;&#x800C;&#x5B58;&#x5728;&#x3002;&#x8FD9;&#x4E5F;&#x610F;&#x5473;&#x7740;&#xFF0C;&#x6BCF;&#x4E2A;&#x5E94;&#x7528;&#x5C06;&#x4EC5;&#x4EC5;&#x5305;&#x542B;&#x4E00;&#x4E2A; store &#x5B9E;&#x4F8B;&#x3002;&#x5355;&#x4E00;&#x72B6;&#x6001;&#x6811;&#x8BA9;&#x6211;&#x4EEC;&#x80FD;&#x591F;&#x76F4;&#x63A5;&#x5730;&#x5B9A;&#x4F4D;&#x4EFB;&#x4E00;&#x7279;&#x5B9A;&#x7684;&#x72B6;&#x6001;&#x7247;&#x6BB5;&#xFF0C;&#x5728;&#x8C03;&#x8BD5;&#x7684;&#x8FC7;&#x7A0B;&#x4E2D;&#x4E5F;&#x80FD;&#x8F7B;&#x6613;&#x5730;&#x53D6;&#x5F97;&#x6574;&#x4E2A;&#x5F53;&#x524D;&#x5E94;&#x7528;&#x72B6;&#x6001;&#x7684;&#x5FEB;&#x7167;&#x3002;</p>
<p>&#x5355;&#x72B6;&#x6001;&#x6811;&#x548C;&#x6A21;&#x5757;&#x5316;&#x5E76;&#x4E0D;&#x51B2;&#x7A81;&#x2014;&#x2014;&#x5728;&#x540E;&#x9762;&#x7684;&#x7AE0;&#x8282;&#x91CC;&#x6211;&#x4EEC;&#x4F1A;&#x8BA8;&#x8BBA;&#x5982;&#x4F55;&#x5C06;&#x72B6;&#x6001;&#x548C;&#x72B6;&#x6001;&#x53D8;&#x66F4;&#x4E8B;&#x4EF6;&#x5206;&#x5E03;&#x5230;&#x5404;&#x4E2A;&#x5B50;&#x6A21;&#x5757;&#x4E2D;&#x3002;</p>
<h3 id="&#x5728;-vue-&#x7EC4;&#x4EF6;&#x4E2D;&#x83B7;&#x5F97;-vuex-&#x72B6;&#x6001;">&#x5728; Vue &#x7EC4;&#x4EF6;&#x4E2D;&#x83B7;&#x5F97; Vuex &#x72B6;&#x6001;</h3>
<p>&#x90A3;&#x4E48;&#x6211;&#x4EEC;&#x5982;&#x4F55;&#x5728; Vue &#x7EC4;&#x4EF6;&#x4E2D;&#x5C55;&#x793A;&#x72B6;&#x6001;&#x5462;&#xFF1F;&#x7531;&#x4E8E; Vuex &#x7684;&#x72B6;&#x6001;&#x5B58;&#x50A8;&#x662F;&#x54CD;&#x5E94;&#x5F0F;&#x7684;&#xFF0C;&#x4ECE; store &#x5B9E;&#x4F8B;&#x4E2D;&#x8BFB;&#x53D6;&#x72B6;&#x6001;&#x6700;&#x7B80;&#x5355;&#x7684;&#x65B9;&#x6CD5;&#x5C31;&#x662F;&#x5728;<a href="https://cn.vuejs.org/guide/computed.html" target="_blank">&#x8BA1;&#x7B97;&#x5C5E;&#x6027;</a>&#x4E2D;&#x8FD4;&#x56DE;&#x67D0;&#x4E2A;&#x72B6;&#x6001;&#xFF1A;</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// &#x521B;&#x5EFA;&#x4E00;&#x4E2A; Counter &#x7EC4;&#x4EF6;</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">`&lt;div&gt;{{ count }}&lt;/div&gt;`</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>&#x6BCF;&#x5F53; <code>store.state.count</code> &#x53D8;&#x5316;&#x7684;&#x65F6;&#x5019;, &#x90FD;&#x4F1A;&#x91CD;&#x65B0;&#x6C42;&#x53D6;&#x8BA1;&#x7B97;&#x5C5E;&#x6027;&#xFF0C;&#x5E76;&#x4E14;&#x89E6;&#x53D1;&#x66F4;&#x65B0;&#x76F8;&#x5173;&#x8054;&#x7684; DOM&#x3002;</p>
<p>&#x7136;&#x800C;&#xFF0C;&#x8FD9;&#x79CD;&#x6A21;&#x5F0F;&#x5BFC;&#x81F4;&#x7EC4;&#x4EF6;&#x4F9D;&#x8D56;&#x5168;&#x5C40;&#x72B6;&#x6001;&#x5355;&#x4F8B;&#x3002;&#x5728;&#x6A21;&#x5757;&#x5316;&#x7684;&#x6784;&#x5EFA;&#x7CFB;&#x7EDF;&#x4E2D;&#xFF0C;&#x5728;&#x6BCF;&#x4E2A;&#x9700;&#x8981;&#x4F7F;&#x7528; state &#x7684;&#x7EC4;&#x4EF6;&#x4E2D;&#x9700;&#x8981;&#x9891;&#x7E41;&#x5730;&#x5BFC;&#x5165;&#xFF0C;&#x5E76;&#x4E14;&#x5728;&#x6D4B;&#x8BD5;&#x7EC4;&#x4EF6;&#x65F6;&#x9700;&#x8981;&#x6A21;&#x62DF;&#x72B6;&#x6001;&#x3002;</p>
<p>Vuex &#x901A;&#x8FC7; <code>store</code> &#x9009;&#x9879;&#xFF0C;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x79CD;&#x673A;&#x5236;&#x5C06;&#x72B6;&#x6001;&#x4ECE;&#x6839;&#x7EC4;&#x4EF6;&#x201C;&#x6CE8;&#x5165;&#x201D;&#x5230;&#x6BCF;&#x4E00;&#x4E2A;&#x5B50;&#x7EC4;&#x4EF6;&#x4E2D;&#xFF08;&#x9700;&#x8C03;&#x7528; <code>Vue.use(Vuex)</code>&#xFF09;&#xFF1A;</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">&apos;#app&apos;</span><span class="token punctuation">,</span>
  <span class="token comment" spellcheck="true">// &#x628A; store &#x5BF9;&#x8C61;&#x63D0;&#x4F9B;&#x7ED9; &#x201C;store&#x201D; &#x9009;&#x9879;&#xFF0C;&#x8FD9;&#x53EF;&#x4EE5;&#x628A; store &#x7684;&#x5B9E;&#x4F8B;&#x6CE8;&#x5165;&#x6240;&#x6709;&#x7684;&#x5B50;&#x7EC4;&#x4EF6;</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">`
    &lt;div class=&quot;app&quot;&gt;
      &lt;counter&gt;&lt;/counter&gt;
    &lt;/div&gt;
  `</span></span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>&#x901A;&#x8FC7;&#x5728;&#x6839;&#x5B9E;&#x4F8B;&#x4E2D;&#x6CE8;&#x518C; <code>store</code> &#x9009;&#x9879;&#xFF0C;&#x8BE5; store &#x5B9E;&#x4F8B;&#x4F1A;&#x6CE8;&#x5165;&#x5230;&#x6839;&#x7EC4;&#x4EF6;&#x4E0B;&#x7684;&#x6240;&#x6709;&#x5B50;&#x7EC4;&#x4EF6;&#x4E2D;&#xFF0C;&#x4E14;&#x5B50;&#x7EC4;&#x4EF6;&#x80FD;&#x901A;&#x8FC7; <code>this.$store</code> &#x8BBF;&#x95EE;&#x5230;&#x3002;&#x8BA9;&#x6211;&#x4EEC;&#x66F4;&#x65B0;&#x4E0B; <code>Counter</code> &#x7684;&#x5B9E;&#x73B0;&#xFF1A;</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> Counter <span class="token operator">=</span> <span class="token punctuation">{</span>
  template<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`&lt;div&gt;{{ count }}&lt;/div&gt;`</span></span><span class="token punctuation">,</span>
  computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    count <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>$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-&#x8F85;&#x52A9;&#x51FD;&#x6570;"><code>mapState</code> &#x8F85;&#x52A9;&#x51FD;&#x6570;</h3>
<p>&#x5F53;&#x4E00;&#x4E2A;&#x7EC4;&#x4EF6;&#x9700;&#x8981;&#x83B7;&#x53D6;&#x591A;&#x4E2A;&#x72B6;&#x6001;&#x65F6;&#x5019;&#xFF0C;&#x5C06;&#x8FD9;&#x4E9B;&#x72B6;&#x6001;&#x90FD;&#x58F0;&#x660E;&#x4E3A;&#x8BA1;&#x7B97;&#x5C5E;&#x6027;&#x4F1A;&#x6709;&#x4E9B;&#x91CD;&#x590D;&#x548C;&#x5197;&#x4F59;&#x3002;&#x4E3A;&#x4E86;&#x89E3;&#x51B3;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x4F7F;&#x7528; <code>mapState</code> &#x8F85;&#x52A9;&#x51FD;&#x6570;&#x5E2E;&#x52A9;&#x6211;&#x4EEC;&#x751F;&#x6210;&#x8BA1;&#x7B97;&#x5C5E;&#x6027;&#xFF0C;&#x8BA9;&#x4F60;&#x5C11;&#x6309;&#x51E0;&#x6B21;&#x952E;&#xFF1A;</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// &#x5728;&#x5355;&#x72EC;&#x6784;&#x5EFA;&#x7684;&#x7248;&#x672C;&#x4E2D;&#x8F85;&#x52A9;&#x51FD;&#x6570;&#x4E3A; Vuex.mapState</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">&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 function">mapState</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// &#x7BAD;&#x5934;&#x51FD;&#x6570;&#x53EF;&#x4F7F;&#x4EE3;&#x7801;&#x66F4;&#x7B80;&#x7EC3;</span>
    count<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">&gt;</span> state<span class="token punctuation">.</span>count<span class="token punctuation">,</span>

    <span class="token comment" spellcheck="true">// &#x4F20;&#x5B57;&#x7B26;&#x4E32;&#x53C2;&#x6570; &apos;count&apos; &#x7B49;&#x540C;&#x4E8E; `state =&gt; state.count`</span>
    countAlias<span class="token punctuation">:</span> <span class="token string">&apos;count&apos;</span><span class="token punctuation">,</span>

    <span class="token comment" spellcheck="true">// &#x4E3A;&#x4E86;&#x80FD;&#x591F;&#x4F7F;&#x7528; `this` &#x83B7;&#x53D6;&#x5C40;&#x90E8;&#x72B6;&#x6001;&#xFF0C;&#x5FC5;&#x987B;&#x4F7F;&#x7528;&#x5E38;&#x89C4;&#x51FD;&#x6570;</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>&#x5F53;&#x6620;&#x5C04;&#x7684;&#x8BA1;&#x7B97;&#x5C5E;&#x6027;&#x7684;&#x540D;&#x79F0;&#x4E0E; state &#x7684;&#x5B50;&#x8282;&#x70B9;&#x540D;&#x79F0;&#x76F8;&#x540C;&#x65F6;&#xFF0C;&#x6211;&#x4EEC;&#x4E5F;&#x53EF;&#x4EE5;&#x7ED9; <code>mapState</code> &#x4F20;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x6570;&#x7EC4;&#x3002;</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">// &#x6620;&#x5C04; this.count &#x4E3A; store.state.count</span>
  <span class="token string">&apos;count&apos;</span>
<span class="token punctuation">]</span><span class="token punctuation">)</span>
</code></pre>
<h3 id="&#x5BF9;&#x8C61;&#x5C55;&#x5F00;&#x8FD0;&#x7B97;&#x7B26;">&#x5BF9;&#x8C61;&#x5C55;&#x5F00;&#x8FD0;&#x7B97;&#x7B26;</h3>
<p><code>mapState</code> &#x51FD;&#x6570;&#x8FD4;&#x56DE;&#x7684;&#x662F;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x3002;&#x6211;&#x4EEC;&#x5982;&#x4F55;&#x5C06;&#x5B83;&#x4E0E;&#x5C40;&#x90E8;&#x8BA1;&#x7B97;&#x5C5E;&#x6027;&#x6DF7;&#x5408;&#x4F7F;&#x7528;&#x5462;&#xFF1F;&#x901A;&#x5E38;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x4F7F;&#x7528;&#x4E00;&#x4E2A;&#x5DE5;&#x5177;&#x51FD;&#x6570;&#x5C06;&#x591A;&#x4E2A;&#x5BF9;&#x8C61;&#x5408;&#x5E76;&#x4E3A;&#x4E00;&#x4E2A;&#xFF0C;&#x4EE5;&#x4F7F;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x5C06;&#x6700;&#x7EC8;&#x5BF9;&#x8C61;&#x4F20;&#x7ED9; <code>computed</code> &#x5C5E;&#x6027;&#x3002;&#x4F46;&#x662F;&#x81EA;&#x4ECE;&#x6709;&#x4E86;<a href="https://github.com/sebmarkbage/ecmascript-rest-spread" target="_blank">&#x5BF9;&#x8C61;&#x5C55;&#x5F00;&#x8FD0;&#x7B97;&#x7B26;</a>&#xFF08;&#x73B0;&#x5904;&#x4E8E; ECMASCript &#x63D0;&#x6848; stage-4 &#x9636;&#x6BB5;&#xFF09;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x6781;&#x5927;&#x5730;&#x7B80;&#x5316;&#x5199;&#x6CD5;&#xFF1A;</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">// &#x4F7F;&#x7528;&#x5BF9;&#x8C61;&#x5C55;&#x5F00;&#x8FD0;&#x7B97;&#x7B26;&#x5C06;&#x6B64;&#x5BF9;&#x8C61;&#x6DF7;&#x5165;&#x5230;&#x5916;&#x90E8;&#x5BF9;&#x8C61;&#x4E2D;</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="&#x7EC4;&#x4EF6;&#x4ECD;&#x7136;&#x4FDD;&#x6709;&#x5C40;&#x90E8;&#x72B6;&#x6001;">&#x7EC4;&#x4EF6;&#x4ECD;&#x7136;&#x4FDD;&#x6709;&#x5C40;&#x90E8;&#x72B6;&#x6001;</h3>
<p>&#x4F7F;&#x7528; Vuex &#x5E76;&#x4E0D;&#x610F;&#x5473;&#x7740;&#x4F60;&#x9700;&#x8981;&#x5C06;<strong>&#x6240;&#x6709;&#x7684;</strong>&#x72B6;&#x6001;&#x653E;&#x5165; Vuex&#x3002;&#x867D;&#x7136;&#x5C06;&#x6240;&#x6709;&#x7684;&#x72B6;&#x6001;&#x653E;&#x5230; Vuex &#x4F1A;&#x4F7F;&#x72B6;&#x6001;&#x53D8;&#x5316;&#x66F4;&#x663E;&#x5F0F;&#x548C;&#x6613;&#x8C03;&#x8BD5;&#xFF0C;&#x4F46;&#x4E5F;&#x4F1A;&#x4F7F;&#x4EE3;&#x7801;&#x53D8;&#x5F97;&#x5197;&#x957F;&#x548C;&#x4E0D;&#x76F4;&#x89C2;&#x3002;&#x5982;&#x679C;&#x6709;&#x4E9B;&#x72B6;&#x6001;&#x4E25;&#x683C;&#x5C5E;&#x4E8E;&#x5355;&#x4E2A;&#x7EC4;&#x4EF6;&#xFF0C;&#x6700;&#x597D;&#x8FD8;&#x662F;&#x4F5C;&#x4E3A;&#x7EC4;&#x4EF6;&#x7684;&#x5C40;&#x90E8;&#x72B6;&#x6001;&#x3002;&#x4F60;&#x5E94;&#x8BE5;&#x6839;&#x636E;&#x4F60;&#x7684;&#x5E94;&#x7528;&#x5F00;&#x53D1;&#x9700;&#x8981;&#x8FDB;&#x884C;&#x6743;&#x8861;&#x548C;&#x786E;&#x5B9A;&#x3002;</p>

                                
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