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<!DOCTYPE html>
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<article id="post-commonjs" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2019/06/19/commonjs/" class="article-date">
<time datetime="2019-06-19T08:22:59.000Z" itemprop="datePublished">2019-06-19</time>
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<a class="article-title" href="/2019/06/19/commonjs/">CommonJS规范</a>
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<blockquote>
<p>最近做了一点环境模拟的工作,还是有点意思的,无意中发现自己其实已经在实现CommonJS规范了,那就正好去学习一下。<br>本来想上来就总结一下commonJS规范的概念,然后放一段完美的原理实现代码,perfect!其实最早也是按照这个模式去写了(一如既往的知识点搬来主义,哈哈哈),但是想了想还是从自己如何一步步实现并理解模块定义加载的角度来写,感觉这样印象更深更有助于理解。</p>
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<a href="/2019/06/19/commonjs/#more">more >></a>
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<!--
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<article id="post-puppeteer" class="article article-type-post" itemscope itemprop="blogPost">
<div class="article-meta">
<a href="/2019/04/02/puppeteer/" class="article-date">
<time datetime="2019-04-02T14:47:05.000Z" itemprop="datePublished">2019-04-02</time>
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<a class="article-title" href="/2019/04/02/puppeteer/">Puppeteer</a>
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<div class="article-entry" itemprop="articleBody">
<p><a href="https://github.com/GoogleChrome/puppeteer">Puppeteer</a>(词的原意是操纵木偶)是一个通过<a href="https://chromedevtools.github.io/devtools-protocol/">DevTools Protocol</a>控制headless chrome或chromium的node库,也可以通过配置来使用(non-headless)chrome或chromium。</p>
<blockquote>
<p>chromium是谷歌开源的web浏览器项目,chrome是基于chromium开发的。</p>
</blockquote>
<p>Puppeteer可以做什么?用户在浏览器中手动执行的大部分操作都可以通过puppeteer完成。</p>
</div>
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<a class="article-category-link" href="/categories/Front-End/">Front-End</a>
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<ul class="article-tag-list"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/NodeJS/">NodeJS</a></li></ul>
</div>
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<a href="/2019/04/02/puppeteer/#more">more >></a>
</p>
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</article>
<!--
-->
<article id="post-koa" class="article article-type-post" itemscope itemprop="blogPost">
<div class="article-meta">
<a href="/2019/03/28/koa/" class="article-date">
<time datetime="2019-03-28T13:59:07.000Z" itemprop="datePublished">2019-03-28</time>
</a>
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<h1 itemprop="name">
<a class="article-title" href="/2019/03/28/koa/">Koa</a>
</h1>
</header>
<div class="article-entry" itemprop="articleBody">
<h2 id="写在前面"><a href="#写在前面" class="headerlink" title="写在前面"></a>写在前面</h2><p>工作后很久没有更新博文了,一些事看不惯,一些事改变不了,从开始积极地想要做些什么,到现在连伪工作都算不上,让自己不得不好好想想了。回过头来看自己工作这半年多,能说道说道的也只有混淆了(ps.接触了混淆,真心觉得混淆这门艺术高大上),不过不能在这里分享,就只能在这里巩固拓展学习了~</p>
<h2 id="Koa"><a href="#Koa" class="headerlink" title="Koa"></a>Koa</h2><p><code>koa</code>由<code>express</code>的原班人马打造,和<code>express</code>相比,<code>koa</code>是一个轻量级的node框架,它的所有功能都能通过中间件实现,这种插拔式的架构设计模式,很符合<code>unix</code>哲学。</p>
<blockquote>
<p>有关unix哲学,核心是简单原则,可以看<a href="http://www.ruanyifeng.com/blog/2009/06/unix_philosophy.html">这篇</a>以及文末的评论。</p>
<p>想到最近实现的一个混淆策略,已经在实现第二版,但代码还是越写越绕,mentor在发现我第二版的混淆策略仍然有处理不了的样例时说让我改的下一版更优雅些、代码易懂一点。代码越写越绕的原因应该是写的过程中发现需要兼容到某几种特殊样例的情况,每次为了兼容这种情况都会在原有基础上改,改到后面看见那一坨坨的代码就晕。。。感觉还是自己思考时站的高度不够。</p>
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<a class="article-title" href="/2018/08/27/spider/">Spider & Anti-Spider</a>
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<p>最近沉迷爬虫无法自拔。。。做到现在也算是有点收获,总结一下。</p>
</blockquote>
<p>最开始想要爬的APP,用Charles抓包发现,抓到携带数据的包都是zip,批量解压后分析发现并没有有效的数据。猜测数据传输不是HTTP协议,抓不到包,只能通过<a href="https://mp.weixin.qq.com/s/vaqFkjj5Mg_f3JkZXhzLYQ">群控</a>来做。</p>
<p>然后想分析一些其它同类的APP,鉴于之前分析移动端APP可能抓不到包的情况,转而去看有没有对应的微信小程序。微信小程序的请求是一定能抓到包的,因为,微信小程序的项目在编译时是将wxml、wxss编译成js来压缩打包为wxapkg文件,微信小程序在微信中的运行其实就是在微信内嵌浏览器(渲染引擎:安卓端X5内核,IOS端Webkit内核)的JSCore(JS引擎)中解压执行JS代码。而浏览器中的请求一定是遵循http协议的(HTTP协议是Web浏览器和服务器之间通信一定遵循的规则)。所以比移动端APP抓到包的概率大很多。</p>
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<h2 id="Base64"><a href="#Base64" class="headerlink" title="Base64"></a>Base64</h2><p>Base64是一种基于64个可打印(可见)字符来表示二进制数据的表示方式。</p>
<p>用记事本去打开<code>exe</code>、<code>jpg</code>等文件时,会看到一大堆乱码,这是因为二进制文件中包含很多无法显示和打印的字符(计算机中任何数据都是按ascii码存储的,而ascii码的128个字符中有32个是不可见字符)。世界上存在着多种编码方式,同一个二进制数字可以被解释成不同的符号。因此,要想打开一个文本文件,就必须知道它的编码方式,否则用错误的编码方式解读,就会出现乱码。Base64是一种任意二进制到文本字符串的编码方法,常用于在URL、Cookie、网页中传输少量二进制数据。</p>
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<a class="article-title" href="/2018/05/03/sapiens/">Sapiens —— A Brief History of Humankind</a>
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<h2 id="写在前面"><a href="#写在前面" class="headerlink" title="写在前面"></a>写在前面</h2><p>这学期无脑的写论文和改论文学习生活实在是百无聊赖,尽管同时也在学习英语看英语原著,但总是感觉有些乏味没能满足我的精神需求。虽然被困在学校困在实验室里,但思想不能被束缚。之前听过《人类简史》的大名,偶然在知乎上刷推荐书单看到,就决定读了。从小看的最多都是教科书课外辅导书作文书,可能是因为反感死记硬背,一直不喜欢文科类的科目,只喜欢理科思维性的科目,所以课外阅读很少,也直接导致了我看问题肤浅不够深入。不想说这本书论点论据的正确性,因为我还不够格来评价,只是在看的过程中发现书中很多观点和诠释问题的角度是对我固有思维的冲击,第一次在看书的过程中思维有了饥渴的感觉。看前半部分内容的过程中都在惊叹作者奇特的角度和观点,看到后面慢慢地自己能通过作者独特的视角去思考看待一些问题了。这本《人类简史》应该算是我的思维启蒙书了~~</p>
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<h2 id="写在前面"><a href="#写在前面" class="headerlink" title="写在前面"></a>写在前面</h2><p>毕业🎓前的日子真是度日如年,只能看书学英语参加各种英语角活动看视频,而且除了跑实验写的那点已经很久很久没有敲代码了。。。稍微学点东西安慰自己。。。之前只是知道Git这些命令怎么用,没有更详细地了解过。看廖老师的博文学习再学一遍Git加深印象。</p>
<h2 id="Git:分布式版本控制系统"><a href="#Git:分布式版本控制系统" class="headerlink" title="Git:分布式版本控制系统"></a>Git:分布式版本控制系统</h2><p>Git自动记录每次文件改动,还可以多人协作编辑,即版本控制,Github则是为开源项目免费提供Git存储。</p>
<p>Git是Linus为了方便管理Linux内核开发而开发的一个源码版本控制软件。</p>
<p>分布式版本控制系统没有中央服务器,比集中式版本控制系统 (例如:SVN)安全性高很多。Git不仅仅是不需要联网这么简单,还有极其强大的分支管理。</p>
<p>安装成功后Git需要自报家门,<code>--global</code>参数,用了这个参数,表示你这台机器上所有的Git仓库都会使用这个配置,当然也可以对某个仓库指定不同的用户名和Email地址。</p>
<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">$ git config --global user.name "Your Name"</div><div class="line">$ git config --global user.email "email@example.com"</div></pre></td></tr></table></figure>
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<p>以前都没有总结过去一年的习惯,2017年感觉是我成长到现在最充实最有成就感的一年,想记录下来,当未来某天回首这一年能够为自己这一年的奋斗付出成长而热泪盈眶。</p>
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<p>2017年,我24周岁,研三,在大连上学已经是第七年。</p>
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<a class="article-title" href="/2017/11/26/reduction/">Nonlinear Dimensionality Reduction —— LE & LLE</a>
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<h2 id="写在前面"><a href="#写在前面" class="headerlink" title="写在前面"></a>写在前面</h2><p>最近恶补了线性代数的知识,大一时《线性代数》的课本居然一直留着,惊讶到我了,因为本科毕业时把所有课本都卖了,不知怎么想的唯独没卖《线性代数》这本书,当时居然知道三年后自己会用到,感觉好神奇😄。特别推荐一下<a href="https://mp.weixin.qq.com/mp/profile_ext?action=home&__biz=MzIyMTU0NDMyNA==&scene=124&#wechat_redirect">马同学高等数学</a>公众号以及感谢<a href="https://github.com/dovebaby">@大壮学长</a>的讲解。</p>
<h2 id="降维"><a href="#降维" class="headerlink" title="降维"></a>降维</h2><p>高维数据意味着需要超过两个或三个维度来表示数据,在高维情形下出现的数据样本稀疏、距离计算困难等问题,是所有机器学习方法共同面对的严重障碍,称为“维数灾难”。</p>
<p>缓解维数灾难的重要途径是降维,即通过某种数学变换将原始高维属性空间转为一个低维子空间,在这个子空间中样本密度大幅提高,距离计算也变得更为容易。为什么能降维呢?因为很多时候,观测或收集到数据样本虽然是高维的,但与学习任务相关的也许仅是某个低维分布,即高维空间中的一个低维嵌入(embedding)。</p>
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<h2 id="写在前面"><a href="#写在前面" class="headerlink" title="写在前面"></a>写在前面</h2><p>研二下做的文本分析不做了,转战机器学习人脸识别(老板要求发高质量高水平的文章),没接触过这个领域,不知道自己可以做到什么程度,这次有靠谱学长指导总是很欣慰的(比起之前小老师出去创业只能自己瞎鼓捣好太多了)。</p>
<p><strong><code>Day 2017/10/18:</code></strong> 学长推荐入门阅读 <a href="http://ieeexplore.ieee.org/abstract/document/4483511/">Robust Face Recognition via Sparse Representation</a></p>
<p>说实话自己英文阅读水平很一般,而且线性代数学的那些知识基本都还给老师了,这篇论文看的着实心累。再加上自己很反感写论文,看的进度很慢,基本看几个词就走神的那种。在此特别特别特别感谢<a href="https://github.com/liuguochao">@超哥</a>的耐心讲解。</p>
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