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5.3. Object api
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6.4. intercept & observe
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6.12. complete api overview
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8. 贴士与技巧
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8.3. 如何(不)使用装饰器
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8.4. 使用 trace 进行调试
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8.5. 定义数据存储
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8.6. 优化 React 组件
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8.7. 开发工具
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8.8. spy
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<a href=".." >5.3. Object api</a>
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<h2 id="直接操控-observable"><a name="直接操控-observable" class="plugin-anchor" href="#直接操控-observable"><i class="fa fa-link" aria-hidden="true"></i></a>直接操控 Observable</h2>
<p>现在有一个统一的工具 API 可以操控 observable 映射、对象和数组。这些 API 都是响应式的，这意味着如果使用 <code>set</code> 进行添加，使用 <code>values</code> 或 <code>keys</code> 进行迭代，即便是新属性的声明都可以被 MobX 检测到。</p>
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<li><strong><code>values(thing)</code></strong> 将集合中的所有值作为数组返回</li>
<li><strong><code>keys(thing)</code></strong> 将集合中的所有键作为数组返回</li>
<li><strong><code>entries(thing)</code></strong> 返回集合中的所有项的键值对数组</li>
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<p>使用 MobX 5 时, 实际上并不需要以下方法，但它们可以用来在 MobX 4 中来实现类似于 MobX 5 的行为:</p>
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<li><strong><code>set(thing, key, value)</code></strong> 或 <strong><code>set(thing, { key: value })</code></strong> 使用提供的键值对来更新给定的集合</li>
<li><strong><code>remove(thing, key)</code></strong> 从集合中移除指定的项。用于数组拼接</li>
<li><strong><code>has(thing, key)</code></strong> 如果集合中存在指定的 <em>observable</em> 属性就返回 true</li>
<li><strong><code>get(thing, key)</code></strong> 返回指定键下的子项</li>
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<pre><code class="lang-javascript"><span class="hljs-keyword">import</span> { get, set, observable, values } <span class="hljs-keyword">from</span> <span class="hljs-string">"mobx"</span>
<span class="hljs-keyword">const</span> twitterUrls = observable.object({
<span class="hljs-string">"John"</span>: <span class="hljs-string">"twitter.com/johnny"</span>
})
autorun(() => {
<span class="hljs-built_in">console</span>.log(get(twitterUrls, <span class="hljs-string">"Sara"</span>)) <span class="hljs-comment">// get 可以追踪尚未存在的属性</span>
})
autorun(() => {
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">"All urls: "</span> + values(twitterUrls).join(<span class="hljs-string">", "</span>))
})
set(twitterUrls, { <span class="hljs-string">"Sara"</span> : <span class="hljs-string">"twitter.com/horsejs"</span>})
</code></pre>
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