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<article id="post-创建一个精准又具有矫正能力的倒计时" class="article article-type-post" itemscope itemprop="blogPost">
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<a class="article-title" href="/2016/11/25/创建一个精准又具有矫正能力的倒计时/">创建一个精准又具有矫正能力的倒计时</a>
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<h3 id="倒计时如果既精确又可以避免各种bug"><a href="#倒计时如果既精确又可以避免各种bug" class="headerlink" title="倒计时如果既精确又可以避免各种bug"></a>倒计时如果既精确又可以避免各种bug</h3><p>本demo依赖moment库处理时间计算（时间计算不是本文章重点）</p>
<p>下面先简单介绍一下moment在本文章用的地方，如果有兴趣自行百度看文档</p>
<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></pre></td><td class="code"><pre><div class="line"><span class="keyword">let</span> nowTime = <span class="keyword">new</span> <span class="built_in">Date</span>();<span class="comment">//获取当前时间</span></div><div class="line"><span class="keyword">let</span> targetTime = moment(nowTime).add(<span class="number">90</span>,<span class="string">'seconds'</span>);<span class="comment">//获取90秒后的时间</span></div><div class="line"><span class="built_in">console</span>.info(moment(targetTime).diff(moment(),<span class="string">'seconds'</span>));<span class="comment">//89</span></div></pre></td></tr></table></figure>
<p>下面开始正题</p>
<p>比如现在我们想要做一个获取验证码的按钮，下面给这个按钮写点击事件，在最早以前我写计时器都是这样写的</p>
<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></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">getCode</span>(<span class="params"></span>)</span>{</div><div class="line"> <span class="keyword">let</span> beginNum = <span class="number">90</span>;</div><div class="line"> <span class="keyword">let</span> showCount = <span class="literal">true</span>;<span class="comment">//用来判断是否显示点击获取验证码按钮</span></div><div class="line"> <span class="keyword">var</span> timer = setInterval(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>{</div><div class="line"> <span class="keyword">if</span>(beginNum <= <span class="number">0</span>){</div><div class="line"> showCount = <span class="literal">false</span>;</div><div class="line"> clearInterval(timer);</div><div class="line"> <span class="keyword">return</span>;</div><div class="line"> }</div><div class="line"> beginNum = beginNum - <span class="number">1</span>;</div><div class="line"> },<span class="number">1000</span>)</div><div class="line">}</div></pre></td></tr></table></figure>
<p>这样写会有很多很多问题，比如如果你的浏览器开启过多页面或者其他应用占内存太多，就会出现js的卡顿，当js卡顿时计算就会不精准，难以达到跟服务器的过期时间相匹配；还有在移动端的时候你会发现另一个有趣的bug，就是如果你点击获取验证码之后，后台这个程序，js会休眠，你过一个小时回到这个应用里面（假设没有被后台杀掉），你会发现计时器还停留在你后台这个app的时间，因为js休眠了，很尴尬的一个问题不是吗</p>
<p>后来经过启发，我做了另一版倒计时</p>
<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></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">getCode</span>(<span class="params"></span>)</span>{</div><div class="line"> <span class="keyword">let</span> beginNum;</div><div class="line"> <span class="keyword">let</span> showCount = <span class="literal">true</span>;</div><div class="line"> <span class="keyword">var</span> timer = setInterval(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>{</div><div class="line"> <span class="keyword">if</span>(beginNum <= <span class="number">0</span>){</div><div class="line"> showCount = <span class="literal">false</span>;</div><div class="line"> clearInterval(timer);</div><div class="line"> <span class="keyword">return</span>;</div><div class="line"> }</div><div class="line"> beginNum = moment(targetTime).diff(moment(),<span class="string">'seconds'</span>);</div><div class="line"> },<span class="number">1000</span>)</div><div class="line">}</div></pre></td></tr></table></figure>
<p>这个写法的好处就是，获取到了启动倒计时终点的时间，每隔一秒都会重新获取当前时间进行比对，获取差值，就算后台js被休眠了，当你回到这个应用，很快就会被矫正过来。</p>
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<time datetime="2016-11-25T11:17:12.000Z" itemprop="datePublished"><i class="icon-clock"></i>2016-11-25</time>
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<article id="post-es6-Destructuring" class="article article-type-post" itemscope itemprop="blogPost">
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<a class="article-title" href="/2016/11/24/es6-Destructuring/">es6-Destructuring</a>
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<h3 id="es6解构赋值的一些解析"><a href="#es6解构赋值的一些解析" class="headerlink" title="es6解构赋值的一些解析"></a>es6解构赋值的一些解析</h3><p>es6正式推出已经有一段时间了，相信大家也看了很多的文档。这里有一些曾经困惑我的小疑问，我来解释一下。</p>
<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></pre></td><td class="code"><pre><div class="line"><span class="keyword">var</span> obj = {</div><div class="line"> <span class="attr">a</span>:<span class="number">215</span>,</div><div class="line"> <span class="attr">b</span>:<span class="number">34</span></div><div class="line">};</div><div class="line"><span class="keyword">var</span> {a,b} = obj;</div><div class="line"><span class="built_in">console</span>.info(a); <span class="comment">//215</span></div></pre></td></tr></table></figure>
<p>相信大家如果看过es6文档，对这个应该不陌生，那么这里有一个问题，解构出来的这个a是不是全局变量呢？来，我们继续往下看</p>
<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></pre></td><td class="code"><pre><div class="line"><span class="keyword">let</span> a = <span class="number">1</span>;</div><div class="line"><span class="keyword">var</span> obj = {</div><div class="line"> <span class="attr">a</span>:<span class="number">215</span>,</div><div class="line"> <span class="attr">b</span>:<span class="number">34</span></div><div class="line">};</div><div class="line"><span class="keyword">var</span> {a,b} = obj;</div><div class="line"><span class="built_in">console</span>.info(a); <span class="comment">//215</span></div></pre></td></tr></table></figure>
<p>我一开始一直不太理解，这里面到底发生了什么事后来我发现</p>
<p><code>var {a,b} = obj</code>可以解释为这样<code>let a = obj.a;let b=obj.b</code>不难看出，a的值最终是被重新定义并赋值了</p>
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<time datetime="2016-11-24T14:38:33.000Z" itemprop="datePublished"><i class="icon-clock"></i>2016-11-24</time>
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<a class="article-title" href="/2016/05/24/firstpage/">第一次搭建博客随便写写</a>
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<h3 id="第一次自己搭建博客"><a href="#第一次自己搭建博客" class="headerlink" title="第一次自己搭建博客"></a>第一次自己搭建博客</h3><p>一个经验不怎么丰富的前端，按照我们leader的对我的评价就是不求甚解。我也很承认这句话啊，，只是表面会用，但是并不懂其中原理，没有深层次的掌握理解。</p>
<p>一开始做这行主要是大学毕业后，对人生的迷茫，在大学舍友的带领下，走上了前端这一条不归路。老实讲，我以为随便干个三四年就能成为一个全栈工程师，后来发现我想多了。首先，前端这条路是走不到头的，或者说再怎么样经验丰富的前端也不会能够独当一面，前端转全栈的学习曲线过于陡峭；其次，随着这几年移动端的蓬勃发展，前端也越来越抢手，然而前端框架和新知识的更新速度更是日新月异，简直是像飞一样，，在我刚从事前端的那年，熟练掌握jqery就能叫做大神了，到处都抢着，，到现在你要是没有个mvc、mvvm 的框架的项目经验都很难找到工作了。几个月一个大版本，以前的东西全都推翻重来，着实看不到头。</p>
<p>人生还是要有自己的规划，当然了，除了富二代以外，其他跟我一样的普通人做程序员运气占百分之七十，剩下的三十看你的能力了。碰到一个好的团队，半年带你飞黄腾达也不是什么不能想的事。没有点儿拿的出手的本事，缺乏学习能力跟不上时代步伐的人也是走不远的。</p>
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