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<!DOCTYPE html>
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fancybox: false,
fastclick: false,
lazyload: false,
tabs: true,
motion: {"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},
algolia: {
applicationID: '',
apiKey: '',
indexName: '',
hits: {"per_page":10},
labels: {"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}
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<h1 id="正则表达式"><a href="#正则表达式" class="headerlink" title="正则表达式"></a>正则表达式</h1><p>本次分享，帮助大家整体过一遍正则表达式的常用基础知识点，能够在以后的工作中，举一反三，不必害怕。</p>
<h2 id="从最简单开始——尽可能严谨的给出匹配规则"><a href="#从最简单开始——尽可能严谨的给出匹配规则" class="headerlink" title="从最简单开始——尽可能严谨的给出匹配规则"></a>从最简单开始——尽可能严谨的给出匹配规则</h2><p>现在有一串<code>坚果pro</code>在微信下的useragent信息，通过大量的观察，可以发现，所有的<code>坚果pro</code>都有一个<code>OD</code>标识，且后面紧跟一串数字作为他的具体型号。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Mozilla/5.0 (Linux; U; Android 7.1.1; zh-CN; OD105 Build/NMF26F) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.108 UCBrowser/12.1.3.993 Mobile Safari/537.36</span><br></pre></td></tr></table></figure></p>
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<a class="post-title-link" href="/2019/01/28/Promise/" itemprop="url">Promise</a></h1>
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<h2 id="一、最简单Promnise"><a href="#一、最简单Promnise" class="headerlink" title="一、最简单Promnise"></a>一、最简单Promnise</h2><p>根据定义可知，<code>promise</code>是一个规范，规范并不在意<code>promise</code>是怎样<code>create</code>、<code>reject</code>，<code>fulfill</code>。规范只在意有木有一个<code>then</code>方法。<br>根据我们下面的使用方式<br><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> p = <span class="keyword">new</span> MyPromise(<span class="function"><span class="keyword">function</span> (<span class="params">resolve, reject</span>) </span>{</span><br><span class="line"> setTimeout(<span class="function"><span class="params">()</span> =></span> {</span><br><span class="line"> resolve(<span class="number">100</span>);</span><br><span class="line"> }, <span class="number">5000</span>);</span><br><span class="line">});</span><br><span class="line"></span><br><span class="line">p.then(<span class="function"><span class="keyword">function</span> (<span class="params">data</span>) </span>{</span><br><span class="line"> <span class="built_in">console</span>.log(data);</span><br><span class="line">});</span><br></pre></td></tr></table></figure></p>
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<a class="post-title-link" href="/2018/04/11/自适应照片墙布局/" itemprop="url">自适应照片墙布局</a></h1>
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<p>最近，业务上对照片处理的需求比较多，其中有一个照片瀑布流的效果，类似于<a href="https://500px.com/" target="_blank" rel="noopener">500px</a>，实现图片自适应的等高、无拉伸、无剪裁显示。大概效果如下图所示。</p>
<p>开始以为会有点好玩的算法，通过<code>js</code>简单控制图片的排列，后来发现，在已知每幅图的宽高的情况下，只需<code>css</code>即可实现这样的效果。<br><img src="/assets/201804/cssphotolayout.png" alt="cssphotolayout"></p>
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<p>在这一节中，我们将给<code>Feact</code>增加<code>setState</code>方法，这个方法非常有趣，端起饮料好好享受吧。</p>
<h3 id="给Feact添加state"><a href="#给Feact添加state" class="headerlink" title="给Feact添加state"></a>给<code>Feact</code>添加<code>state</code></h3><p><code>state</code>和<code>props</code>非常相似，他们都是组件在渲染的时候，流动在内部的数据。不同的是<code>props</code>来自于外部，<code>state</code>是内部的。到目前为止，<code>Feact</code>只支持<code>props</code>，所以，在我们搞出<code>setState</code>之前，我们得先给这个小框架增加个<code>state</code>这个概念。</p>
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<p>上两篇中，<code>React</code>具有了基本的渲染能力。但是，一旦渲染发生，就不能再改变了。这一篇中，我们将在<code>render</code>中，添加更新功能,并且，将简单的展示<code>虚拟dom</code>的<code>diff</code>过程。</p>
<h3 id="简单更新"><a href="#简单更新" class="headerlink" title="简单更新"></a>简单更新</h3><p>让React应用实现更新，最普通的办法就是调用组件的<code>setState()</code>方法。但是，<code>React</code>也支持通过<code>React.render()</code>来实现更新。就像如下所示：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">React.render(<h1>hello</h1>, root);</span><br><span class="line"></span><br><span class="line">setTimeout(<span class="function"><span class="params">()</span> =></span> {</span><br><span class="line"> React.render(<h1>hello again</h1>, root);</span><br><span class="line">}, <span class="number">2000</span>)</span><br></pre></td></tr></table></figure>
<p>本篇中，我们暂时忽略<code>setState()</code>，先通过<code>Feact.render()</code>来实现更新。说实话，这就是最屌丝的『<code>props</code>改变，所以更新』的模型，即如果你又<code>render</code>了，并且传入了不同的<code>props</code>给子组件，那么就更新呗。</p>
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