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<a class="post-title-link" href="/2020/09/09/leetcode-128/" itemprop="url">128. 最长连续序列</a></h1>
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<h3 id="说明"><a href="#说明" class="headerlink" title="说明"></a><a href="https://leetcode-cn.com/problems/longest-consecutive-sequence/" target="_blank" rel="noopener">说明</a></h3><p>给定一个未排序的整数数组，找出最长连续序列的长度。<br>要求算法的时间复杂度为 O(n)。<br>示例:<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">输入: [100, 4, 200, 1, 3, 2]</span><br><span class="line">输出: 4</span><br><span class="line">解释: 最长连续序列是 [1, 2, 3, 4]。它的长度为 4。</span><br></pre></td></tr></table></figure></p>
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<a class="post-title-link" href="/2020/08/08/react-context-1/" itemprop="url">react中context无法阻止渲染问题</a></h1>
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<p>使用react的context之后，会导致组件被刷新。很多时候为了减少render的次数，我们不得不使用shouldUpdate或memo等方法，但是当组件使用了context上下文之后，无论你的反回值是true或false,只要context里的值发生了改变，都无法阻止组件的render，这也是因为组件需要监听context值的变化，但有时，我们并不需要所有变化都被更新。<a href="https://zh-hans.reactjs.org/docs/context.html" target="_blank" rel="noopener">参考</a></p>
<h3 id="解决思路"><a href="#解决思路" class="headerlink" title="解决思路"></a>解决思路</h3><ul>
<li>更新时不使用扩展符{…}，context就不会生成新的对象，但明显不合理。</li>
<li>把值存在顶层的state中，不存context中，这样又有点绕，得不偿失</li>
<li>使用EventEmitter这种发布式模式，不在本次讨论范围内，包括使用redux的方案</li>
<li>使用不同颗粒度的context</li>
<li>既然使用了useContext的组件一定会被render，只要把useContext进行上移即可，移到父组件上去调用，相当于一种折中的方式，把大量子组件的更新context的方法移交到父组件中去，这样就可以变相的优化了。<br> 在以上几点中，我最后选择了使用第五点，也就是把context的使用提升到了父级，这就有点类似于redux中的connect组件了，在这里可以把context转化成props传入子组件，然后在子组件中判断props的变化。</li>
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