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Mac环境下关闭指定端口进程
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<p>一次Webapck打包进度卡在70%,<code>Ctrl+C</code>退出后,重启Webpack发现一直提示端口被占用.</p>
</blockquote>
<h3 id="查看指定端口进程"><a href="#查看指定端口进程" class="headerlink" title="查看指定端口进程"></a>查看指定端口进程</h3><p>查找<code>8001</code>端口被哪个进程占用:<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><span class="comment"># lsof -i:8001</span></div></pre></td></tr></table></figure></p>
<p>结果显示<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME</div><div class="line">node 1577 relign 24u IPv4 0xf4c52151f2395907 0t0 TCP *:vcom-tunnel (LISTEN)</div></pre></td></tr></table></figure></p>
<p>我们可以看到一个node进程占用了<code>8001</code>端口.<br>输出各列信息的意义如下:</p>
<ul>
<li><code>COMMAND</code> 进程的名称,也就是启动的程序名</li>
<li><code>PID</code> 进程的ID</li>
<li><code>USER</code> 进程属主的名字</li>
<li><code>FD</code> 文件描述符,应用程序通过文件描述符识别该文件.如<code>CWD</code>,<code>txt</code>等</li>
<li><code>TYPE</code> 文件的类型,如<code>DIR</code>、<code>REG</code>等</li>
<li><code>DEVICE</code> 指定磁盘的名称</li>
<li><code>SIZE</code> 文件的大小</li>
<li><code>NODE</code> 索引节点(文件在磁盘上的标识)</li>
<li><code>NAME</code> 打开文件的确切名称</li>
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CORS跨域资源共享总结
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<p>使用<code>XMLHttpRequest</code>对象和<code>Fetch</code>发起HTTP请求就必须遵守<a href="https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy">同源策略</a>.<br>而CORS就是W3C推出的一个标准,用来解决跨域问题.</p>
<h3 id="CORS"><a href="#CORS" class="headerlink" title="CORS"></a>CORS</h3><p>CORS,全称是”跨域资源共享”(Cross-origin resource sharing).这种方式让Web应用服务器能支持跨站访问控制,从而使得安全地进行跨站数据传输成为可能.</p>
<p>跨源资源共享标准通过新增一系列 HTTP 头,让服务器能声明哪些来源可以通过浏览器访问该服务器上的资源.另外,对那些会对服务器数据造成破坏性影响的 HTTP 请求方法(特别是 GET 以外的 HTTP 方法,或者搭配某些MIME类型的POST请求),标准强烈要求浏览器必须先以 OPTIONS 请求方式发送一个预请求(preflight request),从而获知服务器端对跨源请求所支持 HTTP 方法.在确认服务器允许该跨源请求的情况下,以实际的 HTTP 请求方法发送那个真正的请求.服务器端也可以通知客户端,是不是需要随同请求一起发送信用信息(包括 Cookies 和 HTTP 认证相关数据).</p>
<p>浏览器将CORS请求分成两类: 简单请求(simple request) 和非简单请求(not-so-simple request);</p>
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Angular小坑之ngIf和ngModel
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<p>Angular项目需求开发中偶遇小坑,发现利用<code>ngModel</code>绑定值后,监测不到值的变化.<br>于是简单写了个demo复现了这种情况:</p>
<iframe height='437' scrolling='no' title='WogMpK' src='//codepen.io/relign/embed/WogMpK/?height=437&theme-id=0&default-tab=html,result&embed-version=2' frameborder='no' allowtransparency='true' allowfullscreen='true' style='width: 100%;'>See the Pen <a href='http://codepen.io/relign/pen/WogMpK/'>WogMpK</a> by songruigang (<a href='http://codepen.io/relign'>@relign</a>) on <a href='http://codepen.io'>CodePen</a>.<br></iframe>
<p>这种情况发生在<code>ng-if</code>中嵌套一个<code>ng-model</code>,<code>ng-model</code>就会无效.</p>
<p>AngularJS中<code>ng-show</code>,<code>ng-hide</code>,<code>ng-if</code>用来控制DOM元素的显示和隐藏,<br>不同的是<code>ng-show</code>和<code>ng-hide</code>是通过计算表达式的值来控制增加还是删除DOM元素的类名(<code>ng-hide</code>),详细见源码:<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// ngHide</span></div><div class="line"><span class="keyword">var</span> ngHideDirective = [<span class="string">'$animate'</span>, <span class="function"><span class="keyword">function</span>(<span class="params">$animate</span>) </span>{</div><div class="line"> <span class="keyword">return</span> <span class="function"><span class="keyword">function</span>(<span class="params">scope, element, attr</span>) </span>{</div><div class="line"> scope.$watch(attr.ngHide, <span class="function"><span class="keyword">function</span> <span class="title">ngHideWatchAction</span>(<span class="params">value</span>)</span>{</div><div class="line"> $animate[toBoolean(value) ? <span class="string">'addClass'</span> : <span class="string">'removeClass'</span>](element, <span class="string">'ng-hide'</span>);</div><div class="line"> });</div><div class="line"> };</div><div class="line">}];</div><div class="line"><span class="comment">// ngShow</span></div><div class="line"><span class="keyword">var</span> ngShowDirective = [<span class="string">'$animate'</span>, <span class="function"><span class="keyword">function</span>(<span class="params">$animate</span>) </span>{</div><div class="line"> <span class="keyword">return</span> <span class="function"><span class="keyword">function</span>(<span class="params">scope, element, attr</span>) </span>{</div><div class="line"> scope.$watch(attr.ngShow, <span class="function"><span class="keyword">function</span> <span class="title">ngShowWatchAction</span>(<span class="params">value</span>)</span>{</div><div class="line"> $animate[toBoolean(value) ? <span class="string">'removeClass'</span> : <span class="string">'addClass'</span>](element, <span class="string">'ng-hide'</span>);</div><div class="line"> });</div><div class="line"> };</div><div class="line">}];</div></pre></td></tr></table></figure></p>
<p><code>ng-hide</code>类名是控制CSS的<code>display</code>属性值.</p>
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【总结】调研实现高性能动画
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<p>本文是调研如何实现高性能动画,提升用户体验的总结,文章内容来源于对看过的相关技术文章的总结,相关技术文章已列到文章末尾,如有遗漏,敬请谅解.</p>
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<p>快速响应和高度交互的页面往往能够吸引大量的用户群体.相反,如果页面存在性能低下的动画,动画不流畅,动画过程中页面闪烁等等,如此粗糙的交互体验必然丧失用户量. </p>
<p>对于大多数的设备而言,屏幕以 60 次每秒的频率刷新,即<code>60HZ</code>.如果一个动画中的某些帧超过了这个时间,就会导致浏览器的刷新频率跟不上设备的刷新频率（跳帧现象）,出现页面闪烁.因此,高性能的动画都应该保持在<code>60fps</code>左右. </p>
<p>接下来我们看几种动画的实现方式.</p>
<h3 id="基于setTimeout或者setInterval实现的动画"><a href="#基于setTimeout或者setInterval实现的动画" class="headerlink" title="基于setTimeout或者setInterval实现的动画"></a>基于<code>setTimeout</code>或者<code>setInterval</code>实现的动画</h3><h4 id="基于帧算法实现的动画"><a href="#基于帧算法实现的动画" class="headerlink" title="基于帧算法实现的动画"></a>基于帧算法实现的动画</h4>
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