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<article id="post-axios工具函数源码学习" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<h1 itemprop="name">
<a class="article-title" href="/2022/01/16/axios%E5%B7%A5%E5%85%B7%E5%87%BD%E6%95%B0%E6%BA%90%E7%A0%81%E5%AD%A6%E4%B9%A0/">axios工具函数源码学习</a>
</h1>
<a href="/2022/01/16/axios%E5%B7%A5%E5%85%B7%E5%87%BD%E6%95%B0%E6%BA%90%E7%A0%81%E5%AD%A6%E4%B9%A0/" class="archive-article-date">
<time datetime="2022-01-16T01:05:16.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2022-01-16</time>
</a>
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<div class="article-entry" itemprop="articleBody">
<p>源码共读活动：<a target="_blank" rel="noopener" href="https://www.yuque.com/ruochuan12/notice/p19">第19期 | axios 工具函数</a><br>仓库：<a target="_blank" rel="noopener" href="https://github.com/axios/axios">axios</a>，<a target="_blank" rel="noopener" href="https://github1s.com/axios/axios/blob/HEAD/lib/utils.js#L198">在线查看</a><br></p>
<h2 id="学习目标"><a href="#学习目标" class="headerlink" title="学习目标"></a>学习目标</h2><ol>
<li>初步学会看源码</li>
<li>学会 axios 中的10多个工具函数</li>
</ol>
<p></p>
<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><p>axios的工具函数主要是用于各种数据类型的判断，以及对数据进行二次处理，如下便是所有的工具函数：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">module</span>.exports = {</span><br><span class="line"> <span class="comment">// 判断数组</span></span><br><span class="line"> isArray: isArray,</span><br><span class="line"> <span class="comment">// 判断ArrayBuffer（通用的、固定长度的原始二进制数据缓冲区）</span></span><br><span class="line"> isArrayBuffer: isArrayBuffer,</span><br><span class="line"> <span class="comment">// 判断是否是Buffer</span></span><br><span class="line"> isBuffer: isBuffer,</span><br><span class="line"> <span class="comment">// 判断是否是FormData</span></span><br><span class="line"> isFormData: isFormData,</span><br><span class="line"> <span class="comment">// 判断是否是ArrayBufferView （是一个表示以下任意一个 TypedArray 类型的辅助数据类型）</span></span><br><span class="line"> isArrayBufferView: isArrayBufferView,</span><br><span class="line"> <span class="comment">// 判断是否是字符串</span></span><br><span class="line"> isString: isString,</span><br><span class="line"> <span class="comment">// 判断是否是数字</span></span><br><span class="line"> isNumber: isNumber,</span><br><span class="line"> <span class="comment">// 判断是否是对象</span></span><br><span class="line"> isObject: isObject,</span><br><span class="line"> <span class="comment">// 判断是否是纯对象</span></span><br><span class="line"> isPlainObject: isPlainObject,</span><br><span class="line"> <span class="comment">// 判断是否是undefined</span></span><br><span class="line"> isUndefined: isUndefined,</span><br><span class="line"> <span class="comment">// 判断是否是Date</span></span><br><span class="line"> isDate: isDate,</span><br><span class="line"> <span class="comment">// 判断是否是文件类型</span></span><br><span class="line"> isFile: isFile,</span><br><span class="line"> <span class="comment">// 判断是否是Blob</span></span><br><span class="line"> isBlob: isBlob,</span><br><span class="line"> <span class="comment">// 判断是否是函数</span></span><br><span class="line"> isFunction: isFunction,</span><br><span class="line"> <span class="comment">// 判断是否是流</span></span><br><span class="line"> isStream: isStream,</span><br><span class="line"> <span class="comment">// 判断是否是URLSearchParams</span></span><br><span class="line"> isURLSearchParams: isURLSearchParams,</span><br><span class="line"> <span class="comment">// 判断是否是标准浏览器环境</span></span><br><span class="line"> isStandardBrowserEnv: isStandardBrowserEnv,</span><br><span class="line"> <span class="comment">// 遍历对象或数组</span></span><br><span class="line"> forEach: forEach,</span><br><span class="line"> <span class="comment">// 合并对象</span></span><br><span class="line"> merge: merge,</span><br><span class="line"> <span class="comment">// 继承对象进行拓展</span></span><br><span class="line"> extend: extend,</span><br><span class="line"> <span class="comment">// 去除首尾空格</span></span><br><span class="line"> trim: trim,</span><br><span class="line"> <span class="comment">// 删除UTF-8编码中BOM</span></span><br><span class="line"> stripBOM: stripBOM</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<h2 id="前置知识"><a href="#前置知识" class="headerlink" title="前置知识"></a>前置知识</h2><p>因为大部分工具函数都是用于类型判断，所以先了解<code>typeof</code>、<code>instanceof</code>、<code>Object.prototype.toString</code>等的用法很有必要。<br>
<a class="article-more-a" href="/2022/01/16/axios%E5%B7%A5%E5%85%B7%E5%87%BD%E6%95%B0%E6%BA%90%E7%A0%81%E5%AD%A6%E4%B9%A0/#more">more >></a>
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<a class="article-more-a" href="/2022/01/16/axios%E5%B7%A5%E5%85%B7%E5%87%BD%E6%95%B0%E6%BA%90%E7%A0%81%E5%AD%A6%E4%B9%A0/">展开全文 >></a>
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<article id="post-validate-npm-package-name源码学习" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<h1 itemprop="name">
<a class="article-title" href="/2021/12/16/validate-npm-package-name%E6%BA%90%E7%A0%81%E5%AD%A6%E4%B9%A0/">validate-npm-package-name源码学习</a>
</h1>
<a href="/2021/12/16/validate-npm-package-name%E6%BA%90%E7%A0%81%E5%AD%A6%E4%B9%A0/" class="archive-article-date">
<time datetime="2021-12-16T03:58:32.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2021-12-16</time>
</a>
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<p>源码共读活动：<a target="_blank" rel="noopener" href="https://www.yuque.com/ruochuan12/notice/p7">第7期 | validate-npm-package-name 检测 npm 包是否符合标准</a><br>仓库：<a target="_blank" rel="noopener" href="https://github.com/npm/validate-npm-package-name">validate-npm-package-name</a><br>正则表达式可视化：<a target="_blank" rel="noopener" href="https://jex.im/regulex/#!flags=&re=%5E(a%7Cb)*%3F%24">Regulex</a><br></p>
<h2 id="一、介绍"><a href="#一、介绍" class="headerlink" title="一、介绍"></a>一、介绍</h2><h3 id="1-1-概念"><a href="#1-1-概念" class="headerlink" title="1.1 概念"></a>1.1 概念</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">Give me a string and I<span class="string">'ll tell you if it'</span>s a valid npm package name.</span><br><span class="line"></span><br><span class="line">This package <span class="built_in">exports</span> a single synchronous <span class="function"><span class="keyword">function</span> <span class="title">that</span> <span class="title">takes</span> <span class="title">a</span> <span class="title">string</span> <span class="title">as</span> <span class="title">input</span> <span class="title">and</span> <span class="title">returns</span> <span class="title">an</span> <span class="title">object</span> <span class="title">with</span> <span class="title">two</span> <span class="title">properties</span>:</span></span><br><span class="line"><span class="function"></span></span><br><span class="line"><span class="function"><span class="title">validForNewPackages</span> :: <span class="title">Boolean</span></span></span><br><span class="line"><span class="function"><span class="title">validForOldPackages</span> :: <span class="title">Boolean</span></span></span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">谷歌翻译：</span><br><span class="line">接受一个字符串，判断它是否是一个有效的npm包名。</span><br><span class="line"></span><br><span class="line">这个包导出一个同步函数，它接受一个字符串作为输入参数并返回一个具如下有两个属性的对象： </span><br><span class="line">validForNewPackages :: Boolean</span><br><span class="line">validForOldPackages :: Boolean</span><br></pre></td></tr></table></figure>
<p>从概念中可以看出，validate-npm-package-name是用来校验npm包命名是否合法的一个工具。<br></p>
<p>ps：只有在包名合法有效的时候，返回的对象只有validForNewPackages、validForOldPackages两个属性。当包名存在问题时，返回的对象中还会有erros或者warnings。<br></p>
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<a class="article-title" href="/2021/09/05/%E6%96%87%E4%BB%B6%E4%B8%8B%E8%BD%BD/">文件下载</a>
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<h2 id="一、字节"><a href="#一、字节" class="headerlink" title="一、字节"></a>一、字节</h2><h3 id="1-1-概念"><a href="#1-1-概念" class="headerlink" title="1.1 概念"></a>1.1 概念</h3><p><code>字节（Byte）</code>是计算机信息技术用于计量存储容量的一种计量单位，也表示一些计算机编程语言中的数据类型和语言字符。</p>
<p>一个字节存储8位无符号数，储存的数值范围为0-255。</p>
<h3 id="1-2-Byte与bit"><a href="#1-2-Byte与bit" class="headerlink" title="1.2 Byte与bit"></a>1.2 Byte与bit</h3><p><code>数据存储</code>是以<code>“字节”（Byte）</code>为单位，<code>数据传输</code>大多是以<code>“位”（bit，又名“比特”）为单位</code>，一个位就代表一个0或1（即二进制），每8个位（bit，简写为b）组成一个字节（Byte，简写为B），是最小一级的信息单位。</p>
<p>有控制码或非美标码的文件，通常不能在不同电脑系统间直接交换。这类文件有一个通称，叫“二进制文件”(<code>Binary Files</code>)。</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1</span>字节(Byte)=<span class="number">8</span>位(bit)</span><br><span class="line"><span class="number">1</span>KB( Kilobyte，千字节)=<span class="number">1024</span>B</span><br><span class="line"><span class="number">1</span>MB( Megabyte，兆字节)=<span class="number">1024</span>KB</span><br><span class="line"><span class="number">1</span>GB( Gigabyte，吉字节，千兆)=<span class="number">1024</span>MB</span><br><span class="line"><span class="number">1</span>TB( Trillionbyte，万亿字节，太字节)=<span class="number">1024</span>GB</span><br><span class="line"><span class="number">1</span>PB( Petabyte，千万亿字节，拍字节)=<span class="number">1024</span>TB</span><br><span class="line"><span class="number">1</span>EB( Exabyte，百亿亿字节，艾字节)=<span class="number">1024</span>PB</span><br><span class="line"><span class="number">1</span>ZB(Zettabyte，十万亿亿字节，泽字节)=<span class="number">1024</span>EB</span><br><span class="line"><span class="number">1</span>YB( Yottabyte，一亿亿亿字节，尧字节)=<span class="number">1024</span>ZB</span><br><span class="line"><span class="number">1</span>BB( Brontobyte，千亿亿亿字节)=<span class="number">1024</span>YB</span><br></pre></td></tr></table></figure>
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<h3 id="一、盒子拖拽"><a href="#一、盒子拖拽" class="headerlink" title="一、盒子拖拽"></a>一、盒子拖拽</h3><p>原生JS：拖拽目标元素到页面任意位置</p>
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<h2 id="一、模块"><a href="#一、模块" class="headerlink" title="一、模块"></a>一、模块</h2><h3 id="1-1-什么是模块"><a href="#1-1-什么是模块" class="headerlink" title="1.1 什么是模块"></a>1.1 什么是模块</h3><ol>
<li>将一个复杂的程序依据一定的规则(规范)封装成几个块(文件)，并进行组合在一起</li>
<li>块的内部数据与实现是<code>私有</code>的，只是向外部暴露一些接口(方法)与外部其它模块通信
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<h2 id="一、浮点数的存储"><a href="#一、浮点数的存储" class="headerlink" title="一、浮点数的存储"></a>一、浮点数的存储</h2><h3 id="1-1-概念"><a href="#1-1-概念" class="headerlink" title="1.1 概念"></a>1.1 概念</h3>
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<h2 id="一、数据类型-“7-1”"><a href="#一、数据类型-“7-1”" class="headerlink" title="一、数据类型 “7+1”"></a>一、数据类型 “7+1”</h2><h3 id="1-1-概念"><a href="#1-1-概念" class="headerlink" title="1.1 概念"></a>1.1 概念</h3><ol>
<li><strong>7 种原始类型（不可变）：</strong> Boolean、Undefined、Number、String、Null、Symbol(ES6)、BigInt(ES6)</li>
<li><strong>1 种对象类型Object：</strong> 包含了Function、Array、特殊对象（RegExp、Date）
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<h2 id="一、单线程的JavaScript"><a href="#一、单线程的JavaScript" class="headerlink" title="一、单线程的JavaScript"></a>一、单线程的JavaScript</h2><blockquote>
<p>JavaScript 单线程指的是浏览器中负责解释和执行 JavaScript 代码的只有一个线程，即为<strong>JS引擎线程</strong></p>
</blockquote>
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<a href="/2021/01/12/Javascript%E6%B7%B1%E5%85%A5%E7%B3%BB%E5%88%97%EF%BC%88%E5%9B%9B%EF%BC%89%EF%BC%9A%E4%BA%8B%E4%BB%B6%E3%80%81%E4%BA%8B%E4%BB%B6%E6%B5%81%E3%80%81%E4%BA%8B%E4%BB%B6%E5%A7%94%E6%89%98/" class="archive-article-date">
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<h2 id="一、事件绑定、解绑"><a href="#一、事件绑定、解绑" class="headerlink" title="一、事件绑定、解绑"></a>一、事件绑定、解绑</h2><blockquote>
<p><strong>DOM级别一共可以分为4个级别：</strong> DOM0级，DOM1级，DOM2级和DOM3级<br><br><strong>而DOM事件分为3个级别：</strong> DOM0级事件处理，DOM2级事件处理和DOM3级事件处理<br><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/79b24666a9f5414aa1e127c993de1544~tplv-k3u1fbpfcp-watermark.image"></p>
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<h3 id="1-1-DOM0级事件"><a href="#1-1-DOM0级事件" class="headerlink" title="1.1 DOM0级事件"></a>1.1 DOM0级事件</h3><h4 id="1-1-1-HTML事件处理程序-内联模型（行内绑定）"><a href="#1-1-1-HTML事件处理程序-内联模型（行内绑定）" class="headerlink" title="1.1.1 HTML事件处理程序/内联模型（行内绑定）"></a>1.1.1 HTML事件处理程序/内联模型（行内绑定）</h4><blockquote>
<p>HTML事件处理程序，是写在html里面的，是<strong>全局作用域</strong></p>
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<article id="post-Javascript深入系列（三）： 作用域、执行上下文栈、this、闭包" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<h2 id="一、作用域"><a href="#一、作用域" class="headerlink" title="一、作用域"></a>一、作用域</h2><p>作用域就是一个独立的地盘，让变量不会外泄、暴露出去。也就是说作用域最大的用处就是隔离变量，不同作用域下同名变量不会有冲突。</br><br>ES6 之前 JavaScript 没有块级作用域，只有全局作用域和函数作用域。ES6 的到来，为我们提供了<strong>块级作用域</strong>，可通过新增命令 let 和 const 来体现。</p>
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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: 33.333333333333336%" q-on="click: openSlider(e, 'innerArchive')"><a href="javascript:void(0)" q-class="active:innerArchive">所有文章</a></li>
<li style="width: 33.333333333333336%" q-on="click: openSlider(e, 'friends')"><a href="javascript:void(0)" q-class="active:friends">友链</a></li>
<li style="width: 33.333333333333336%" q-on="click: openSlider(e, 'aboutme')"><a href="javascript:void(0)" q-class="active:aboutme">关于我</a></li>
</ul>
</div>
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<section class="tools-section tools-section-all" q-show="innerArchive">
<div class="search-wrap">
<input class="search-ipt" q-model="search" type="text" placeholder="find something…">
<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>
</div>
<div class="widget tagcloud search-tag">
<p class="search-tag-wording">tag:</p>
<label class="search-switch">
<input type="checkbox" q-on="click:toggleTag(e)" q-attr="checked:showTags">
</label>
<ul class="article-tag-list" q-show="showTags">
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">blog</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">Hexo</a>
</li>
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</li>
<div class="clearfix"></div>
</ul>
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<ul class="search-ul">
<p q-show="jsonFail" style="padding: 20px; font-size: 12px;">
缺失模块。<br/>1、请确保node版本大于6.2<br/>2、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/>
3、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: false
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
</pre>
</p>
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<a q-attr="href:path|urlformat" class="search-title"><i class="icon-quo-left icon"></i><span q-text="title"></span></a>
<p class="search-time">
<i class="icon-calendar icon"></i>
<span q-text="date|dateformat"></span>
</p>
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<i class="icon-price-tags icon"></i>
<span q-repeat="tags" q-on="click:choseTag(e, name)" q-text="name|tagformat"></span>
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<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接1</a>
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