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a utilies library reduce boilerplate for vuex
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<a href="." >表单处理</a>
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<h1 id="表单处理">表单处理</h1>
<p>当在严格模式中使用 Vuex 时，在属于 Vuex 的 state 上使用 <code>v-model</code> 会比较棘手：</p>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">v-model</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>obj.message<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
</code></pre>
<p>假设这里的 <code>obj</code> 是在计算属性中返回的一个属于 Vuex store 的对象，在用户输入时，<code>v-model</code> 会试图直接修改 <code>obj.message</code>。在严格模式中，由于这个修改不是在 mutation 函数中执行的, 这里会抛出一个错误。</p>
<p>用“Vuex 的思维”去解决这个问题的方法是：给 <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span><span class="token punctuation">></span></span></code> 中绑定 value，然后侦听 <code>input</code> 或者 <code>change</code> 事件，在事件回调中调用 action:</p>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">:value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>message<span class="token punctuation">"</span></span> <span class="token attr-name">@input</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>updateMessage<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
</code></pre>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// ...</span>
computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token operator">...</span><span class="token function">mapState</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
message<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">></span> state<span class="token punctuation">.</span>obj<span class="token punctuation">.</span>message
<span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
methods<span class="token punctuation">:</span> <span class="token punctuation">{</span>
updateMessage <span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>$store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">'updateMessage'</span><span class="token punctuation">,</span> e<span class="token punctuation">.</span>target<span class="token punctuation">.</span>value<span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>下面是 mutation 函数：</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// ...</span>
mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
updateMessage <span class="token punctuation">(</span>state<span class="token punctuation">,</span> message<span class="token punctuation">)</span> <span class="token punctuation">{</span>
state<span class="token punctuation">.</span>obj<span class="token punctuation">.</span>message <span class="token operator">=</span> message
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="双向绑定的计算属性">双向绑定的计算属性</h3>
<p>必须承认，这样做比简单地使用“<code>v-model</code> + 局部状态”要啰嗦得多，并且也损失了一些 <code>v-model</code> 中很有用的特性。另一个方法是使用带有 setter 的双向绑定计算属性：</p>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">v-model</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>message<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
</code></pre>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// ...</span>
computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
message<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token keyword">get</span> <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>obj<span class="token punctuation">.</span>message
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token keyword">set</span> <span class="token punctuation">(</span>value<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>$store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">'updateMessage'</span><span class="token punctuation">,</span> value<span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
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