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<a class="article-title" href="/2017/04/06/javascript探路-this为何物/">javascript探路:this为何物</a>
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<time datetime="2017-04-06T13:34:04.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-04-06</time>
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<p>“我是谁，我在哪里，谁在打我”，最近在打《守望屁股》的途中经常听到这样的梗，这对本我的探寻似乎在写代码的途中也经常碰到。不信？你是否遇到过这样的错误</p>
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<p>Uncatched TypeError: cannot read property ‘xxx’ of undefined</p>
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<p>或者</p>
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<p>Uncatched TypeError: xxx.yyy is not a function </p>
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<p>回来一查才发现是<code>this.xxx</code>报错了。那么this为何这么神秘？它到底是什么？</p>
<a class="article-more-a" href="/2017/04/06/javascript探路-this为何物/#more">展开全文</a>
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<a href="javascript:void(0)" class="js-tag article-tag-list-link color5">this</a>
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<a class="article-more-a" href="/2017/04/06/javascript探路-this为何物/">阅读全文</a>
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<a class="article-title" href="/2017/03/05/javascript闭包揭秘/">javascript闭包揭秘</a>
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<time datetime="2017-03-05T13:46:47.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-03-05</time>
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<p>闭包是在学习javascript的过程中不可规避的一道屏障。掌握了闭包，才有可能从初级想中级迈进。自从学习js以来，我也看了许多篇关于闭包的文章，但是一致没能完全理解闭包到底是什么？它显得如此神秘，像是深林中的蓝精灵。在经过无数次的实验和查找书籍之后，终于对闭包有了一个较为清晰的理解。</p>
<a class="article-more-a" href="/2017/03/05/javascript闭包揭秘/#more">展开全文</a>
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<a class="article-more-a" href="/2017/03/05/javascript闭包揭秘/">阅读全文</a>
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<a class="article-title" href="/2017/01/09/hello-world/">Hello World</a>
</h1>
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<time datetime="2017-01-09T12:50:09.188Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-01-09</time>
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<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="external">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="external">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="external">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="external">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo new <span class="string">"My New Post"</span></div></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="external">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo server</div></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="external">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo generate</div></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="external">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo deploy</div></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/deployment.html" target="_blank" rel="external">Deployment</a></p>
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<a class="article-more-a" href="/2017/01/09/hello-world/">阅读全文</a>
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<div class="tools-col" q-class="show:isShow,hide:isShow|isFalse" q-on="click:stop(e)">
<div class="tools-nav header-menu">
<ul style="width: 70%">
<li style="width: 50%" q-on="click: openSlider(e, 'innerArchive')"><a href="javascript:void(0)" q-class="active:innerArchive">所有文章</a></li>
<li style="width: 50%" q-on="click: openSlider(e, 'aboutme')"><a href="javascript:void(0)" q-class="active:aboutme">关于我</a></li>
</ul>
</div>
<div class="tools-wrap">
<section class="tools-section tools-section-all" q-show="innerArchive">
<div class="search-wrap">
<input class="search-ipt" q-model="search" type="text" placeholder="搜索文章">
<i class="icon-search icon" q-show="search|isEmptyStr"></i>
<i class="icon-close icon" q-show="search|isNotEmptyStr" q-on="click:clearChose(e)"></i>
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</label>
<ul class="article-tag-list" q-show="showTags">
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">canvas</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">动画</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">javascript</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">闭包</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">this</a>
</li>
<div class="clearfix"></div>
</ul>
</div>
<ul class="search-ul">
<p q-show="jsonFail" style="padding: 20px; font-size: 12px;">
缺失模块。<br/>1、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
2、在根目录_config.yml里添加配置：
<pre style="font-size: 12px;" q-show="jsonFail">
jsonContent:
meta: false
pages: false
posts:
title: true
date: true
path: true
text: true
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
</pre>
</p>
<li class="search-li" q-repeat="items" q-show="isShow">
<a q-attr="href:path|urlformat" class="search-title"><span q-text="title"></span></a>
<p class="search-time">
<i class="icon-calendar icon"></i>
<span q-text="date|dateformat"></span>
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<p class="search-tag">
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<span q-repeat="tags" q-on="click:choseTag(e, name)" q-text="name|tagformat"></span>
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</li>
</ul>
</section>
<section class="tools-section tools-section-me" q-show="aboutme">
<div class="aboutme-wrap" id="js-aboutme">爬行中的前端小菜
有时候停下来喝点茶
</div>
</section>
</div>
</div>
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<div class="pswp__item"></div>
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<div class="pswp__top-bar">
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<div class="pswp__counter"></div>
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<button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>
<button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
<button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
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<div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
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</button>
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<div class="pswp__caption">
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</div>
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