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<h1 itemprop="name">
<a class="article-title" href="/2018/05/28/文件拓展名截取、选取今天是周几写法/">文件拓展名截取、选取今天是周几写法</a>
</h1>
<a href="/2018/05/28/文件拓展名截取、选取今天是周几写法/" class="archive-article-date">
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<h3 id="文件拓展名截取"><a href="#文件拓展名截取" class="headerlink" title="文件拓展名截取"></a>文件拓展名截取</h3><h4 id="之前的方案"><a href="#之前的方案" class="headerlink" title="之前的方案"></a>之前的方案</h4><pre><code class="JavaScript"><span class="keyword">const</span> extname = <span class="function">(<span class="params">filename</span>) =></span> {
<span class="keyword">let</span> arr = filename.split(<span class="string">"."</span>);
<span class="keyword">let</span> len = arr.length;
<span class="keyword">let</span> extname=<span class="string">''</span>
<span class="keyword">if</span>(len > <span class="number">1</span>){
extname = arr[len<span class="number">-1</span>];
extname = arr[len<span class="number">-2</span>]==<span class="string">''</span>?<span class="string">''</span>: <span class="string">`.<span class="subst">${extname}</span>`</span>;
<span class="keyword">return</span> extname
}
<span class="keyword">return</span> extname
}
</code></pre>
<h4 id="改进后的方案：增加几种情况"><a href="#改进后的方案：增加几种情况" class="headerlink" title="改进后的方案：增加几种情况"></a>改进后的方案：增加几种情况</h4><ol>
<li>点后无后缀</li>
<li>无点</li>
<li>有点，前面无文件名</li>
</ol>
<pre><code class="JavaScript"><span class="keyword">const</span> extname2 = <span class="function">(<span class="params">filename</span>) =></span> {
<span class="keyword">let</span> index = filename.lastIndexOf(<span class="string">"."</span>);
<span class="keyword">let</span> len = filename.length
<span class="keyword">if</span>(index <= <span class="number">0</span>||index == len<span class="number">-1</span>){
<span class="keyword">return</span> <span class="string">''</span>
}<span class="keyword">else</span>{
<span class="keyword">return</span> filename.substring(index,len)
}
}
</code></pre>
<a class="article-more-a" href="/2018/05/28/文件拓展名截取、选取今天是周几写法/#more">more >></a>
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<a href="javascript:void(0)" class="js-tag article-tag-list-link color5">js优化</a>
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<a class="article-more-a" href="/2018/05/28/文件拓展名截取、选取今天是周几写法/">展开全文 >></a>
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<article id="post-ES6总结（二）" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2018/05/25/ES6总结（二）/">ES6总结（二）</a>
</h1>
<a href="/2018/05/25/ES6总结（二）/" class="archive-article-date">
<time datetime="2018-05-25T02:28:50.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-05-25</time>
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<ul class="article-tag-list">
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag article-tag-list-link color4">ES6</a>
</li>
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<a class="article-more-a" href="/2018/05/25/ES6总结（二）/">展开全文 >></a>
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<article id="post-ES6总结（一）" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2018/05/24/ES6总结（一）/">ES6总结（一）</a>
</h1>
<a href="/2018/05/24/ES6总结（一）/" class="archive-article-date">
<time datetime="2018-05-24T02:28:43.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-05-24</time>
</a>
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<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><p>这篇是个人总结的ES6用法，可能是不全面，但项目开发中用到的ES6语法基本都有。</p>
<h3 id="let和const命令"><a href="#let和const命令" class="headerlink" title="let和const命令"></a>let和const命令</h3><h4 id="作用域的概念"><a href="#作用域的概念" class="headerlink" title="作用域的概念"></a>作用域的概念</h4><p>ES5：全局作用域和函数作用域<br>ES6：块级作用域；严格模式</p>
<h4 id="如何使用let和const"><a href="#如何使用let和const" class="headerlink" title="如何使用let和const"></a>如何使用let和const</h4><ol>
<li>let声明的变量只在自己的作用域内有效；</li>
<li>let不能重复定义变量；</li>
<li>const声明一个常量，不能修改；</li>
<li>const声明的时候必须赋值；</li>
<li>const可以修改一个对象的数值，因为const保存的是对象的指针，并不保存对象本身；</li>
</ol>
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<a class="article-title" href="/2018/05/23/技术人员如何规划职业道路/">技术人员如何规划职业道路</a>
</h1>
<a href="/2018/05/23/技术人员如何规划职业道路/" class="archive-article-date">
<time datetime="2018-05-23T01:44:10.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-05-23</time>
</a>
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<h1 id="前言："><a href="#前言：" class="headerlink" title="前言："></a>前言：</h1><p> 前段时间在微信直播群里听到了前阿里钉钉技术总监、现准上市公司技术合伙人/副总裁武彻老师的技术分享：如何从小白成长为技术合伙人。刚听完觉得就是一些假大空的套话，将一些不痛不痒的理论并不能对实际开发做什么指导。<br>但是，这段时间我一直在想，既然是成功者的分享也是有一定的借鉴之处，只靠一场技术分享就能有很多收获或进步是不可能的，开发经验的累积和思考，一步步的积累才会有所进步。真正让人感到“痛苦”的成长，才会有收获。<br>下面是关于直播的一些分享：</p>
<h2 id="1-技术的价值"><a href="#1-技术的价值" class="headerlink" title="1.技术的价值"></a>1.技术的价值</h2><h3 id="先进生产力"><a href="#先进生产力" class="headerlink" title="先进生产力"></a>先进生产力</h3><p>一个公司技术团队的稳健是实现一切需求的基石，尤其需求在不同阶段对产品质量以及响应方面的高要求。</p>
<h3 id="实现需求三步曲"><a href="#实现需求三步曲" class="headerlink" title="实现需求三步曲"></a>实现需求三步曲</h3><ol>
<li>勉强做出来 </li>
<li>独挡一面 </li>
<li>成为tl</li>
</ol>
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<h2 id="TypeScript是什么？"><a href="#TypeScript是什么？" class="headerlink" title="TypeScript是什么？"></a>TypeScript是什么？</h2><ol>
<li>TypeScript是由微软开发的自由和开源的编程语言。它是JavaScript的一个超集，而且本质上向这个语言添加了可选的静态类型和基于类的面向对象编程。</li>
<li>TypeScript 扩展了 JavaScript 的句法，所以任何现有的 JavaScript 程序可以不加改变的在 TypeScript 下工作。TypeScript 是为大型应用之开发而设计，而编译时它产生 JavaScript 以确保兼容性。</li>
</ol>
<p>安装：npm install -g typescript<br>编译：tsc app.ts # app.ts => app.js</p>
<h2 id="TypeScript数据类型"><a href="#TypeScript数据类型" class="headerlink" title="TypeScript数据类型"></a>TypeScript数据类型</h2><ul>
<li>Boolean类型：</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">let</span> isDone: boolean = <span class="literal">false</span>; <span class="comment">// tsc => var isDone = false;</span></div></pre></td></tr></table></figure>
<ul>
<li>Number类型：</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">let</span> count: number = <span class="number">10</span>; <span class="comment">// tsc => var count = 10;</span></div></pre></td></tr></table></figure>
<ul>
<li>String类型：</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">let</span> name: string = <span class="string">'Semliker'</span>; <span class="comment">// tsc => var name = 'Semliker';</span></div></pre></td></tr></table></figure>
<ul>
<li>Array类型：</li>
</ul>
<figure class="highlight javascript"><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"><span class="keyword">let</span> list: number[] = [<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>]; <span class="comment">// tsc => var list = [1,2,3];</span></div><div class="line"><span class="keyword">let</span> list: <span class="built_in">Array</span><number> = [<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>]; <span class="comment">// tsc => var list = [1,2,3];</span></div></pre></td></tr></table></figure>
<ul>
<li>Enum类型：</li>
</ul>
<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">enum Direction {</div><div class="line"> NORTH，</div><div class="line"> SOUTH，</div><div class="line"> EAST，</div><div class="line"> WEST</div><div class="line">};</div><div class="line"><span class="keyword">let</span> dir: Direction = Direction.NORTH;</div></pre></td></tr></table></figure>
<ul>
<li>Any（动态类型）：</li>
</ul>
<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> notSure: any = <span class="number">4</span>;</div><div class="line">notSure = <span class="string">"maybe a string instead"</span>;</div><div class="line">notSure = <span class="literal">false</span>;</div><div class="line">=> <span class="function"><span class="params">tsc</span> =></span></div><div class="line"><span class="keyword">var</span> notSure = <span class="number">4</span>;</div><div class="line">notSure = <span class="string">"maybe a string instead"</span>;</div><div class="line">notSure = <span class="literal">false</span>;</div></pre></td></tr></table></figure>
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<a class="article-title" href="/2018/04/09/Angular2入门/">Angular2入门</a>
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<a href="/2018/04/09/Angular2入门/" class="archive-article-date">
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<h2 id="Angular起源"><a href="#Angular起源" class="headerlink" title="Angular起源"></a>Angular起源</h2><p>2009年，Misko hevery和Adam Abrons在业务时间创造了GetAngular</p>
<h2 id="迭代之路"><a href="#迭代之路" class="headerlink" title="迭代之路"></a>迭代之路</h2><ol>
<li>12年6月，AngularJS1.0.0正式版推出：亮点功能基本齐备，如双向绑定、依赖注入、指令等</li>
<li>AngularJS 1.3.x放弃支持IE8浏览器：推出了单次绑定语法</li>
<li>AngularJS 1.5.x增加类似组件式书写体验：主要是为过渡Angular2做铺垫</li>
</ol>
<h2 id="AngularJS-1-x的困境"><a href="#AngularJS-1-x的困境" class="headerlink" title="AngularJS 1.x的困境"></a>AngularJS 1.x的困境</h2><ol>
<li>饱受诟病的性能问题：脏检查</li>
<li>落后于当前Web发展理念（如组件开发方式）</li>
<li>对手机端不够友好：并没有考虑移动端的适配；太笨重</li>
</ol>
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<h3 id="事件机制："><a href="#事件机制：" class="headerlink" title="事件机制："></a>事件机制：</h3><ul>
<li>在事件机制中，有3样最重要的东西：<ul>
<li>事件生产者</li>
<li>事件对象</li>
<li>事件消费者</li>
</ul>
</li>
<li>事件生产者可以产生一系列的事件对象，然后事件对象携带着必要的信息，传递给事件消费者。<ul>
<li>单向的消息传递模型：事件消息总是由事件生产者传递给事件消费者；</li>
<li>双向的消息传递模型：让两者同时作为事件生产者和事件消费者；一个事件生产者产生的事件可以对应有多个事件消费者；一个事件消费者也可以接受多个事件生产者产生的事件消息；</li>
</ul>
</li>
</ul>
<h3 id="事件流及事件绑定"><a href="#事件流及事件绑定" class="headerlink" title="事件流及事件绑定"></a>事件流及事件绑定</h3><ul>
<li>EMCAScript标准规定事件流包含三个阶段：事件捕获阶段（传递过程），处于目标阶段，事件冒泡阶段（响应过程）。</li>
</ul>
<pre><code class="javascript">target.addEventListener(type, listener, useCapture);
<span class="comment">// 标准注册事件函数 </span>
<span class="comment">// target:文档节点、document、window 或 XMLHttpRequest。 </span>
<span class="comment">// 函数的参数：注册事件类型type，事件的回调函数，事件注册在捕获期间还是冒泡期间 </span>
<span class="comment">// 例如：给button注册onclick事件，要是在捕获阶段注册，则 button.addEventListener("click",function(){},true); </span>
target.removeEventListener(type, listener, useCapture); <span class="comment">//在某一个元素上撤销已注册的事件。</span>
</code></pre>
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<pre><code class="javascript"><script>
<span class="comment">// 音乐播放</span>
<span class="function"><span class="keyword">function</span> <span class="title">autoPlayMusic</span>(<span class="params"></span>) </span>{
<span class="comment">// 自动播放音乐效果，解决浏览器或者APP自动播放问题</span>
<span class="function"><span class="keyword">function</span> <span class="title">musicInBrowserHandler</span>(<span class="params"></span>) </span>{
musicPlay(<span class="literal">true</span>);
<span class="built_in">document</span>.body.removeEventListener(<span class="string">'touchstart'</span>, musicInBrowserHandler);
}
<span class="built_in">document</span>.body.addEventListener(<span class="string">'touchstart'</span>, musicInBrowserHandler);
<span class="comment">// 自动播放音乐效果，解决微信自动播放问题</span>
<span class="function"><span class="keyword">function</span> <span class="title">musicInWeixinHandler</span>(<span class="params"></span>) </span>{
musicPlay(<span class="literal">true</span>);
<span class="built_in">document</span>.addEventListener(<span class="string">"WeixinJSBridgeReady"</span>, <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>{
musicPlay(<span class="literal">true</span>);
}, <span class="literal">false</span>);
<span class="built_in">document</span>.removeEventListener(<span class="string">'DOMContentLoaded'</span>, musicInWeixinHandler);
}
<span class="built_in">document</span>.addEventListener(<span class="string">'DOMContentLoaded'</span>, musicInWeixinHandler);
}
<span class="function"><span class="keyword">function</span> <span class="title">musicPlay</span>(<span class="params">isPlay</span>) </span>{
<span class="keyword">var</span> audio = <span class="built_in">document</span>.getElementById(<span class="string">'music'</span>);
<span class="keyword">if</span> (isPlay && audio.paused) {
audio.play();
}
<span class="keyword">if</span> (!isPlay && !audio.paused) {
audio.pause();
}
}
autoPlayMusic();
<<span class="regexp">/script></span>
</code></pre>
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<ul>
<li>301 redirect: 301 代表永久性转移(Permanently Moved)</li>
<li>302 redirect: 302 代表暂时性转移(Temporarily Moved )</li>
<li>详细来说，301和302状态码都表示重定向，就是说浏览器在拿到服务器返回的这个状态码后会自动跳转到一个新的URL地址，这个地址可以从响应的Location首部中获取（用户看到的效果就是他输入的地址A瞬间变成了另一个地址B）——这是它们的共同点。他们的不同在于。301表示旧地址A的资源已经被永久地移除了（这个资源不可访问了），搜索引擎在抓取新内容的同时也将旧的网址交换为重定向之后的网址；302表示旧地址A的资源还在（仍然可以访问），这个重定向只是临时地从旧地址A跳转到地址B，搜索引擎会抓取新的内容而保存旧的网址。</li>
</ul>
<h3 id="什么是重定向？"><a href="#什么是重定向？" class="headerlink" title="什么是重定向？"></a>什么是重定向？</h3><p>就是地址A跳转到地址B。百度百科的解释：重定向(Redirect)就是通过各种方法将各种网络请求重新定个方向转到其它位置（如：网页重定向、域名的重定向、路由选择的变化也是对数据报文经由路径的一种重定向）。</p>
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<article id="post-HTTP基本概念" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2017/09/29/HTTP基本概念/">HTTP基本概念</a>
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<a href="/2017/09/29/HTTP基本概念/" class="archive-article-date">
<time datetime="2017-09-29T06:50:06.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-09-29</time>
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<h3 id="什么是HTTP"><a href="#什么是HTTP" class="headerlink" title="什么是HTTP"></a>什么是HTTP</h3><ul>
<li>HTTP是干嘛用的？<ul>
<li>学名：超文本传输协议，是一种网络协议。它是基于TCP/IP的应用层协议。被设计用于web浏览器和web服务器之间的通信，也可以用于其他目的。</li>
<li>因为是专门用来传输诸如HTML的超媒体文档等web内容的。因为HTML本身就是超文本标记语言，HTML中包含文本、图片、音视频等内容，所以用来传输它的协议自然就叫超文本传输协议了。</li>
<li>它是web上数据交换的基础，是一种client-server协议，请求通常是由浏览器发起。一个完整的web文档由不同的子文档重新组建成的，如文本，布局描述，图片，视频，脚本等。</li>
</ul>
</li>
<li>怎么和服务器通信？<ul>
<li>HTTP遵循经典的客户端-服务端模型，客户端打开一个连接以发出请求，然后等待它收到服务器端响应。HTTP是无状态协议，意味着服务器不会在两个请求之间保留任何数据（状态）。</li>
<li>客户端和服务端通过交互各自的消息（与数据流正好相反）来进行交互。通常由浏览器这样的客户端发出的消息叫做requests，那么被服务端回应的消息就叫做response。</li>
</ul>
</li>