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<!DOCTYPE html>
<html class="theme-next muse use-motion" lang="zh-Hans">
<head>
<meta charset="UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<link rel="mask-icon" href="/images/logo.svg?v=5.1.4" color="#222">
<meta name="keywords" content="Hexo, NexT" />
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var NexT = window.NexT || {};
var CONFIG = {
root: '/',
scheme: 'Muse',
version: '5.1.4',
sidebar: {"position":"left","display":"post","offset":12,"b2t":false,"scrollpercent":false,"onmobile":false},
fancybox: true,
tabs: true,
motion: {"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},
duoshuo: {
userId: '0',
author: '博主'
},
algolia: {
applicationID: '',
apiKey: '',
indexName: '',
hits: {"per_page":10},
labels: {"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}
}
};
</script>
<link rel="canonical" href="http://obyee.com/"/>
<title>开积的个人博客</title>
</head>
<body itemscope itemtype="http://schema.org/WebPage" lang="zh-Hans">
<div class="container sidebar-position-left
page-home">
<div class="headband"></div>
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<link itemprop="mainEntityOfPage" href="http://obyee.com/2020/05/19/hello-world/">
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<meta itemprop="name" content="kaiji">
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<h1 class="post-title" itemprop="name headline">
<a class="post-title-link" href="/2020/05/19/hello-world/" itemprop="url">Hello World</a></h1>
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2020-05-19
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<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="noopener">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="noopener">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="noopener">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="noopener">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><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="noopener">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><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="noopener">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><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/deployment.html" target="_blank" rel="noopener">Deployment</a></p>
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<link itemprop="mainEntityOfPage" href="http://obyee.com/2018/11/20/react-native环境踩过的坑/">
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<a class="post-title-link" href="/2018/11/20/react-native环境踩过的坑/" itemprop="url">react-native环境踩过的坑</a></h1>
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2018-11-20
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<h1 id="请官网教程先走一波再来"><a href="#请官网教程先走一波再来" class="headerlink" title="请官网教程先走一波再来"></a>请官网教程先走一波再来</h1><p><a href="https://reactnative.cn/docs/getting-started.html" target="_blank" rel="noopener">https://reactnative.cn/docs/getting-started.html</a></p>
<p>以下讨论的坑主要是搭建原生安卓开发环境时，常常会遇到的<br>安装好android studio之后 在没有梯子的前提下，将寸步难行，所以为了可以继续装逼，还是先去搭个稳定的梯子吧<br><a href="https://zoomyale.com/2016/vultr_and_ss" target="_blank" rel="noopener">https://zoomyale.com/2016/vultr_and_ss</a></p>
<h2 id="坑一"><a href="#坑一" class="headerlink" title="坑一"></a>坑一</h2><p>安装好SDK之后 第一时间修改 SDK的安装路径 到内存空间充足的盘符、环境变量ANDROID_HOME修改指向到新的SDK路径<br>SDK占用内存较大，在安装较多版本SDK时可能会把C盘撑爆</p>
<h2 id="坑二"><a href="#坑二" class="headerlink" title="坑二"></a>坑二</h2><p>安装官方模拟器时要严格按照官方文档要求 选择 android 8.1 x86_64 版本的镜像<br>选错镜像的话 跑起来的模拟器会各种报错</p>
<h2 id="坑三"><a href="#坑三" class="headerlink" title="坑三"></a>坑三</h2><p>通过SDKmanager安装的NDK可能不完整，所以要前往android 官方网站<a href="https://developer.android.com/ndk/downloads/?hl=zh-en" target="_blank" rel="noopener">https://developer.android.com/ndk/downloads/?hl=zh-en</a>下载相应的工具包，然后打开toolchains目录<br>对比一下差异（即 缺少哪些文件夹）把缺少的文件夹复制到NDK对应的toolchains目录下<br>详见issue： <a href="https://github.com/google/filament/issues/15" target="_blank" rel="noopener">https://github.com/google/filament/issues/15</a> stark25795的回答</p>
<h2 id="坑四"><a href="#坑四" class="headerlink" title="坑四"></a>坑四</h2><p>安装好JDK 1.8 之后 别忘了 将环境变量 JAVA_HOME 指向到JDK安装目录，默认的JDK安装目录为C:\Program Files\Java\jre1.8.0_191<br>否则在执行react-native run-android 编译时可能会报错Could not find tools.jar.<br>详见<a href="https://stackoverflow.com/questions/47291056/could-not-find-tools-jar-please-check-that-c-program-files-java-jre1-8-0-151-c" target="_blank" rel="noopener">https://stackoverflow.com/questions/47291056/could-not-find-tools-jar-please-check-that-c-program-files-java-jre1-8-0-151-c</a></p>
<h2 id="坑五"><a href="#坑五" class="headerlink" title="坑五"></a>坑五</h2><p>模拟器要跑起来需要依赖CPU的虚拟化技术，可以进入Bios里面设置，不同的品牌有不同的设置方法，请自行百度</p>
<h2 id="坑六"><a href="#坑六" class="headerlink" title="坑六"></a>坑六</h2><p>安装好python2.7.x 之后 还需要把安装目录追加到 环境变量 path后面</p>
<h2 id="坑七"><a href="#坑七" class="headerlink" title="坑七"></a>坑七</h2><p>有些github示例打包的时候提示SDK tool 23.0.1版本过低，导致打包编译失败，解决方案详见issue<br><a href="https://github.com/oblador/react-native-keychain/issues/68" target="_blank" rel="noopener">https://github.com/oblador/react-native-keychain/issues/68</a> SudoPlz的回答</p>
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<h2 id="类的来历"><a href="#类的来历" class="headerlink" title="类的来历"></a>类的来历</h2><p>ECMAScript 2015 中引入的 JavaScript <strong>类</strong>实质上是 JavaScript 现有的基于原型的继承的语法糖（封装了原型继承相关代码实现的语法糖）。类语法不会为JavaScript引入新的面向对象的继承模型。<br>类实际上是个“<strong>特殊的函数</strong>”，就像你能够定义的<strong>函数声明</strong>和<strong>函数表达式</strong>一样，类语法有两个组成部分：<strong>类声明</strong>和<strong>类表达式</strong>。</p>
<h2 id="什么是类声明："><a href="#什么是类声明：" class="headerlink" title="什么是类声明："></a>什么是类声明：</h2><p>类声明就是用来定义一个类的一种方法。要声明一个类，你可以使用带有class关键字的类名（这里的类名叫“Kaiji”）。<br><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"><span class="class"><span class="keyword">class</span> <span class="title">Kaiji</span> </span>{</span><br><span class="line"> <span class="keyword">constructor</span>(height, width) {</span><br><span class="line"> <span class="keyword">this</span>.height = height;</span><br><span class="line"> <span class="keyword">this</span>.width = width;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h2 id="注意："><a href="#注意：" class="headerlink" title="注意："></a>注意：</h2><p><strong>函数声明</strong>和<strong>类声明</strong>之间的一个<strong>重要区别</strong>是函数声明会提升，类声明不会。你首先需要保证已经声明/定义过你的类，然后才能访问它，否则像下面的代码会抛出一个ReferenceError：<br><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> p = <span class="keyword">new</span> Kaiji()</span><br><span class="line"><span class="comment">// ReferenceError</span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Kaiji</span> </span>{}</span><br></pre></td></tr></table></figure></p>
<h2 id="什么是类表达式："><a href="#什么是类表达式：" class="headerlink" title="什么是类表达式："></a>什么是类表达式：</h2><p>类表达式就是用来创建/定义一个类的另一种方式。类表达式又分为<strong>命名表达式</strong>或<strong>匿名表达式</strong>。其中命名表达式的名称是类主体的本地名称（一般与表达式左边的名字一样）。<br><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></pre></td><td class="code"><pre><span class="line"><span class="comment">/* 匿名类 */</span> </span><br><span class="line"><span class="keyword">let</span> Kaiji = <span class="class"><span class="keyword">class</span> </span>{</span><br><span class="line"> <span class="keyword">constructor</span>(height, width) {</span><br><span class="line"> <span class="keyword">this</span>.height = height;</span><br><span class="line"> <span class="keyword">this</span>.width = width;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 命名的类 */</span> </span><br><span class="line"><span class="keyword">let</span> Kaiji = <span class="class"><span class="keyword">class</span> <span class="title">Kaiji</span> </span>{</span><br><span class="line"> <span class="keyword">constructor</span>(height, width) {</span><br><span class="line"> <span class="keyword">this</span>.height = height;</span><br><span class="line"> <span class="keyword">this</span>.width = width;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h2 id="注意：-1"><a href="#注意：-1" class="headerlink" title="注意："></a>注意：</h2><p><strong>函数表达式</strong>和<strong>类表达式</strong>之间的一个<strong>重要区别</strong>是函数表达式会提升，类表达式不会。你首先需要保证已经声明/定义过你的类，然后才能访问它，否则像下面的代码会抛出一个<br>ReferenceError：<br><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> p = <span class="keyword">new</span> Kaiji()</span><br><span class="line"><span class="comment">// ReferenceError</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">let</span> Kaiji = <span class="class"><span class="keyword">class</span> <span class="title">Kaiji</span> </span>{}</span><br></pre></td></tr></table></figure></p>
<h2 id="类由哪些成员构成："><a href="#类由哪些成员构成：" class="headerlink" title="类由哪些成员构成："></a>类由哪些成员构成：</h2><p>大括号{}内部是用于定义类成员的位置，在大括号{}内部的所有代码包括：<strong>构造函数</strong>，<strong>原型方法</strong>，<strong>静态方法</strong>，<strong>getter</strong>和<strong>setter</strong>都在<strong>严格模式</strong>下执行。</p>
<h3 id="第一个成员：构造函数"><a href="#第一个成员：构造函数" class="headerlink" title="第一个成员：构造函数"></a>第一个成员：构造函数</h3><p>构造函数是一个名为：<strong>constructor</strong>的特殊方法，它主要用于<strong>创建和初始化</strong>当前类的一个对象。一个类只能拥有一个名为 “<strong>constructor</strong>”的特殊方法。如果类包含多个constructor的方法，则将抛出 一个<code>SyntaxError</code> 语法错误。<br><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></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Kaiji</span> </span>{</span><br><span class="line"> <span class="keyword">constructor</span>(height, width) {</span><br><span class="line"> <span class="keyword">this</span>.height = height;</span><br><span class="line"> <span class="keyword">this</span>.width = width;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">constructor</span>(height, width) {</span><br><span class="line"> <span class="keyword">this</span>.height = height;</span><br><span class="line"> <span class="keyword">this</span>.width = width;</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// SyntaxError</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h3 id="super关键字"><a href="#super关键字" class="headerlink" title="super关键字"></a>super关键字</h3><p><strong>super</strong> 关键字可以用来 调用<strong>超类</strong> ，超类可以理解为（父类/父对象），同时 <strong>super</strong> 会绑定this指针到父类<br><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></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Cat</span> </span>{ </span><br><span class="line"> <span class="keyword">constructor</span>(name) {</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> speak() {</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.name + <span class="string">' makes a noise.'</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Lion</span> <span class="keyword">extends</span> <span class="title">Cat</span> </span>{</span><br><span class="line"> speak() {</span><br><span class="line"> <span class="comment">// 调用超类（父类）的方法</span></span><br><span class="line"> <span class="keyword">super</span>.speak();</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.name + <span class="string">' roars.'</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h3 id="第二个成员：原型方法"><a href="#第二个成员：原型方法" class="headerlink" title="第二个成员：原型方法"></a>第二个成员：原型方法</h3><p>原型方法就是类内部的一种普通的函数定义，只是它和ES5相比，用了简写的形式<br><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></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Kaiji</span> </span>{</span><br><span class="line"> <span class="comment">// constructor</span></span><br><span class="line"> <span class="keyword">constructor</span>(height, width) {</span><br><span class="line"> <span class="keyword">this</span>.height = height;</span><br><span class="line"> <span class="keyword">this</span>.width = width;</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// Getter</span></span><br><span class="line"> get area() {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.calcArea()</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// 原型方法</span></span><br><span class="line"> calcArea() {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.height * <span class="keyword">this</span>.width;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="keyword">const</span> square = <span class="keyword">new</span> Kaiji(<span class="number">10</span>, <span class="number">10</span>);</span><br><span class="line"></span><br><span class="line"><span class="built_in">console</span>.log(square.area);</span><br><span class="line"><span class="comment">// 100</span></span><br></pre></td></tr></table></figure></p>
<h3 id="第三个成员：静态方法"><a href="#第三个成员：静态方法" class="headerlink" title="第三个成员：静态方法"></a>第三个成员：静态方法</h3><p>静态方法就是使用 static 关键字定义的函数/方法。值得一提的是<strong>调用静态方法不需要实例化该类</strong>，同时<strong>也不能通过一个类的实例来调用静态方法</strong>。静态方法通常用于为一个应用程序创建工具函数。<br><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></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Point</span> </span>{</span><br><span class="line"> <span class="keyword">constructor</span>(x, y) {</span><br><span class="line"> <span class="keyword">this</span>.x = x;</span><br><span class="line"> <span class="keyword">this</span>.y = y;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">static</span> distance(a, b) {</span><br><span class="line"> <span class="keyword">const</span> dx = a.x - b.x;</span><br><span class="line"> <span class="keyword">const</span> dy = a.y - b.y;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="built_in">Math</span>.hypot(dx, dy);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> p1 = <span class="keyword">new</span> Point(<span class="number">5</span>, <span class="number">5</span>);</span><br><span class="line"><span class="keyword">const</span> p2 = <span class="keyword">new</span> Point(<span class="number">10</span>, <span class="number">10</span>);</span><br><span class="line"></span><br><span class="line"><span class="built_in">console</span>.log(Point.distance(p1, p2));</span><br></pre></td></tr></table></figure></p>
<h2 id="类的继承（创建子类）"><a href="#类的继承（创建子类）" class="headerlink" title="类的继承（创建子类）"></a>类的继承（创建子类）</h2><p>如果想基于某个基础类 创建一个子类，或者说 想基于某个基础类 继承一个子类 可以使用 <strong>extends</strong> 关键字在类声明或类表达式中创建一个类作为另一个类的一个子类。<br><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></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Animal</span> </span>{ </span><br><span class="line"> <span class="keyword">constructor</span>(name) {</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> speak() {</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.name + <span class="string">' I am your BaBa'</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Dog</span> <span class="keyword">extends</span> <span class="title">Animal</span> </span>{</span><br><span class="line"> speak() {</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.name + <span class="string">' I am your Son'</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> d = <span class="keyword">new</span> Dog(<span class="string">'Wang!Wang!'</span>);</span><br><span class="line"><span class="comment">// 'Wang!Wang! I am your Son'</span></span><br><span class="line">d.speak();</span><br></pre></td></tr></table></figure></p>
<p><strong>注意：</strong>如果子类中存在构造函数，则需要在使用“this”之前首先调用 super()。<br><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></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Animal</span> </span>{ </span><br><span class="line"> <span class="keyword">constructor</span>(name) {</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> speak() {</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.name + <span class="string">' I am your BaBa'</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Dog</span> <span class="keyword">extends</span> <span class="title">Animal</span> </span>{</span><br><span class="line"> <span class="keyword">constructor</span>(name) {</span><br><span class="line"> <span class="keyword">super</span>(name)</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> }</span><br><span class="line"> speak() {</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.name + <span class="string">' I am your Son'</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> d = <span class="keyword">new</span> Dog(<span class="string">'Wang!Wang!'</span>);</span><br><span class="line"><span class="comment">// 'Wang!Wang! I am your Son'</span></span><br><span class="line">d.speak();</span><br></pre></td></tr></table></figure></p>
<p>另外：<strong>extends</strong> 关键字也可以扩展传统的基于函数的“类”：（也就是通过函数声明创建的类）<br><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">Animal</span> (<span class="params">name</span>) </span>{</span><br><span class="line"> <span class="keyword">this</span>.name = name; </span><br><span class="line">}</span><br><span class="line">Animal.prototype.speak = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>{</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.name + <span class="string">' makes a noise.'</span>);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Dog</span> <span class="keyword">extends</span> <span class="title">Animal</span> </span>{</span><br><span class="line"> speak() {</span><br><span class="line"> <span class="keyword">super</span>.speak();</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.name + <span class="string">' barks.'</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> d = <span class="keyword">new</span> Dog(<span class="string">'Mitzie'</span>);</span><br><span class="line">d.speak();</span><br></pre></td></tr></table></figure></p>
<p><strong>请注意：</strong>类不能继承常规（非可构造）对象。（也就是普通对象，如：单例对象 <code>let a = {}</code>）如果要继承常规对象，可以改用Object.setPrototypeOf()：<br><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> Animal = {</span><br><span class="line"> speak() {</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.name + <span class="string">' makes a noise.'</span>);</span><br><span class="line"> }</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Dog</span> </span>{</span><br><span class="line"> <span class="keyword">constructor</span>(name) {</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="built_in">Object</span>.setPrototypeOf(Dog.prototype, Animal);<span class="comment">// If you do not do this you will get a TypeError when you invoke speak</span></span><br><span class="line"><span class="comment">// 如果不这样做，您将在调用speak时得到一个类型错误</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> d = <span class="keyword">new</span> Dog(<span class="string">'Mitzie'</span>);</span><br><span class="line">d.speak(); <span class="comment">// Mitzie makes a noise.</span></span><br></pre></td></tr></table></figure></p>
<p>（完）<br>参考：<a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Classes" target="_blank" rel="noopener">https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Classes</a><br>参考：<a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Functions/Method_definitions" target="_blank" rel="noopener">https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Functions/Method_definitions</a></p>
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<a class="post-title-link" href="/2018/10/10/自定义页面/" itemprop="url">hexo自定义解析</a></h1>
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<h2 id="目的"><a href="#目的" class="headerlink" title="目的"></a>目的</h2><p>不想使用主题渲染，完全自定义页面样式和交互，例如：制作自己的个人作品页面</p>
<h2 id="步骤"><a href="#步骤" class="headerlink" title="步骤"></a>步骤</h2><p>1、在hexo项目 根目录下找到<code>_config.yml</code> 文件，在里面找到配置项 <code>skip_render</code>：<br>单个文件夹下全部文件：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">skip_render: demo/* // 这是需要跳过markdown转换 直接输出html的目录</span><br></pre></td></tr></table></figure></p>
<p>单个文件夹下指定类型文件：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">skip_render: demo/*.html</span><br></pre></td></tr></table></figure></p>
<p>单个文件夹下全部文件以及子目录：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">skip_render: demo/**</span><br></pre></td></tr></table></figure></p>
<p>多个文件夹以及各种复杂情况：<br><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></pre></td><td class="code"><pre><span class="line">skip_render:</span><br><span class="line"> - demo/*.html</span><br><span class="line"> - demo/**</span><br></pre></td></tr></table></figure></p>
<p>上面的配置 <strong>要不要引号都可以</strong><br>这个目录指向<code>hexo</code>项目 根目录 下的 <code>source</code> 文件夹</p>
<h2 id="注意："><a href="#注意：" class="headerlink" title="注意："></a>注意：</h2><p><strong>修改完<code>skip_render</code>配置项之后 要执行一次 <code>hexo clean</code>，执行完 <code>hexo clean</code>之后 会发现<code>public</code>目录下的<code>CNAME</code>文件 也被清理掉了 这时需要手动从<code>hexo</code>根目录下 拷贝 <code>CNAME</code> 文件 到 <code>public</code> 目录下</strong></p>
<p>推荐把<code>CNAME</code>文件 放到<code>source</code>目录下 这样就可以把<code>CNAME</code>重新生成到<code>public</code>目录了</p>
<p>2、下一步可以在<code>source</code>文件夹里面 新建一个文件夹 <code>demo</code>：<br><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></pre></td><td class="code"><pre><span class="line">|-source</span><br><span class="line">| |-_posts</span><br><span class="line">| |-demo</span><br><span class="line">| | |-index.html</span><br></pre></td></tr></table></figure></p>
<p>3、新建并编辑好<code>index.html</code>之后 运行 <code>hexo generate</code> 就可以跳过 <code>markdown</code> 的编译 ，直接输出<code>html</code>文件到<code>public</code> 文件夹内</p>
<p>4、此时 执行 <code>hexo deploy</code> 完成部署，等待一分钟左右 就可以 在地址栏 输入 <code>https://xxx.xx/demo</code> 访问自定义的页面了<br>（完）<br>参考：<a href="https://www.maoxuner.cn/2017/03/10/hexo-skip-render.html" target="_blank" rel="noopener">https://www.maoxuner.cn/2017/03/10/hexo-skip-render.html</a><br>参考：<a href="https://www.tuicool.com/articles/A36Jby2" target="_blank" rel="noopener">https://www.tuicool.com/articles/A36Jby2</a></p>
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<h2 id="import-函数"><a href="#import-函数" class="headerlink" title="import()函数"></a>import()函数</h2><h3 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h3><p><code>import</code>命令会被 JavaScript 引擎静态分析，先于模块内的其他模块执行（叫做”<code>连接</code>“更合适）。所以，下面的代码会报错。<br><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></pre></td><td class="code"><pre><span class="line"><span class="comment">// 报错</span></span><br><span class="line"><span class="keyword">if</span> (x === <span class="number">2</span>) {</span><br><span class="line"> <span class="keyword">import</span> MyModual <span class="keyword">from</span> <span class="string">'./myModual'</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>上面代码中，引擎处理<code>import</code>语句是在编译时，这时不会去分析或执行if语句，所以<code>import</code>语句放在if代码块之中毫无意义，因此会报句法错误，而不是执行时错误。也就是说，<code>import</code>和<code>export</code>命令只能在模块的顶层，不能在代码块之中（比如，在if代码块之中，或在函数之中）。</p>
<p>这样的设计，固然有利于编译器提高效率，但也导致无法在运行时加载模块。在语法上，条件加载就不可能实现。如果<code>import</code>命令要取代 <code>Node</code> 的<code>require</code>方法，这就形成了一个障碍。因为<code>require</code>是运行时加载模块，<code>import</code>命令无法取代<code>require</code>的动态加载功能。<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> path = <span class="string">'./'</span> + fileName;</span><br><span class="line"><span class="keyword">const</span> myModual = <span class="built_in">require</span>(path);</span><br></pre></td></tr></table></figure></p>
<p>上面的语句就是动态加载，<code>require</code>到底加载哪一个模块，只有运行时才知道。<code>import</code>语句做不到这一点。</p>
<h3 id="因此，有一个提案，建议引入import-函数，完成动态加载。"><a href="#因此，有一个提案，建议引入import-函数，完成动态加载。" class="headerlink" title="因此，有一个提案，建议引入import()函数，完成动态加载。"></a>因此，有一个提案，建议引入import()函数，完成动态加载。</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span>(specifier)</span><br></pre></td></tr></table></figure>
<p>上面代码中，<code>import</code>函数的参数<code>specifier</code>，指定所要加载的模块的位置。<code>import</code>命令能够接受什么参数，<code>import()</code>函数就能接受什么参数，两者区别主要是后者为动态加载。</p>
<h3 id="ES6-import-返回一个-Promise对象。下面是一个例子。"><a href="#ES6-import-返回一个-Promise对象。下面是一个例子。" class="headerlink" title="ES6 import()返回一个 Promise对象。下面是一个例子。"></a>ES6 <code>import()</code>返回一个 <code>Promise</code>对象。下面是一个例子。</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><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> main = <span class="built_in">document</span>.querySelector(<span class="string">'main'</span>);</span><br><span class="line"><span class="keyword">import</span>(<span class="string">`./section-modules/<span class="subst">${someVariable}</span>.js`</span>)</span><br><span class="line">.then(<span class="function"><span class="params">module</span> =></span> {</span><br><span class="line"> <span class="built_in">module</span>.loadPageInto(main);</span><br><span class="line">})</span><br><span class="line">.catch(<span class="function"><span class="params">err</span> =></span> {</span><br><span class="line"> main.textContent = err.message;</span><br><span class="line">});</span><br></pre></td></tr></table></figure>
<p><code>import()</code>函数可以用在任何地方，不仅仅是模块，非模块的脚本也可以使用。它是运行时执行，也就是说，什么时候运行到这一句，也会加载指定的模块。另外，<code>import()</code>函数与所加载的模块没有静态连接关系，这点也是与<code>import</code>语句不相同。</p>
<h3 id="import-类似于-Node-的require方法，区别主要是前者是异步加载，后者是同步加载。"><a href="#import-类似于-Node-的require方法，区别主要是前者是异步加载，后者是同步加载。" class="headerlink" title="import()类似于 Node 的require方法，区别主要是前者是异步加载，后者是同步加载。"></a><code>import()</code>类似于 <code>Node</code> 的<code>require</code>方法，区别主要是前者是异步加载，后者是同步加载。</h3><h3 id="适用场合"><a href="#适用场合" class="headerlink" title="适用场合"></a>适用场合</h3><p>下面是<code>import()</code>的一些适用场合。</p>
<h4 id="（1）按需加载。"><a href="#（1）按需加载。" class="headerlink" title="（1）按需加载。"></a>（1）按需加载。</h4><p>import()可以在需要的时候，再加载某个模块。<br><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></pre></td><td class="code"><pre><span class="line">button.addEventListener(<span class="string">'click'</span>, event => {</span><br><span class="line"> <span class="keyword">import</span>(<span class="string">'./dialogBox.js'</span>)</span><br><span class="line"> .then(<span class="function"><span class="params">dialogBox</span> =></span> {</span><br><span class="line"> dialogBox.open();</span><br><span class="line"> })</span><br><span class="line"> .catch(<span class="function"><span class="params">error</span> =></span> {</span><br><span class="line"> <span class="comment">/* Error handling */</span></span><br><span class="line"> })</span><br><span class="line">});</span><br></pre></td></tr></table></figure></p>
<p>上面代码中，<code>import()</code>方法放在<code>click</code>事件的监听函数之中，只有用户点击了按钮，才会加载这个模块。</p>
<h4 id="（2）条件加载"><a href="#（2）条件加载" class="headerlink" title="（2）条件加载"></a>（2）条件加载</h4><p><code>import()</code>可以放在<code>if</code>代码块，根据不同的情况，加载不同的模块。<br><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (condition) {</span><br><span class="line"> <span class="keyword">import</span>(<span class="string">'moduleA'</span>).then(...);</span><br><span class="line">} <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">import</span>(<span class="string">'moduleB'</span>).then(...);</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>上面代码中，如果满足条件，就加载模块 <strong>A</strong>，否则加载模块 <strong>B</strong>。</p>
<h4 id="（3）动态的模块路径"><a href="#（3）动态的模块路径" class="headerlink" title="（3）动态的模块路径"></a>（3）动态的模块路径</h4><p><code>import()</code>允许模块路径动态生成。<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span>(f())</span><br><span class="line">.then(...);</span><br></pre></td></tr></table></figure></p>
<p>上面代码中，根据函数<code>f</code>的返回结果，加载不同的模块。</p>
<h2 id="注意"><a href="#注意" class="headerlink" title="注意:"></a>注意:</h2><p><code>import()</code>加载模块成功以后，这个模块会作为一个对象，当作<code>then</code>方法的参数。因此，可以使用<strong>对象解构赋值</strong>的语法，获取输出接口。<br><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span>(<span class="string">'./myModule.js'</span>)</span><br><span class="line">.then(<span class="function">(<span class="params">{export1, export2}</span>) =></span> {</span><br><span class="line"> <span class="comment">// ...·</span></span><br><span class="line">});</span><br></pre></td></tr></table></figure></p>
<p>上面代码中，<code>export1</code>和<code>export2</code>都是<code>myModule.js</code>的输出接口，可以解构获得。</p>
<h4 id="如果模块有default输出接口，可以用参数直接获得。"><a href="#如果模块有default输出接口，可以用参数直接获得。" class="headerlink" title="如果模块有default输出接口，可以用参数直接获得。"></a>如果模块有<code>default</code>输出接口，可以用参数直接获得。</h4><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span>(<span class="string">'./myModule.js'</span>)</span><br><span class="line">.then(<span class="function"><span class="params">myModule</span> =></span> {</span><br><span class="line"> <span class="built_in">console</span>.log(myModule.default);</span><br><span class="line">});</span><br></pre></td></tr></table></figure>
<p>上面的代码也可以使用具名输入的形式。<br><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span>(<span class="string">'./myModule.js'</span>)</span><br><span class="line">.then(<span class="function">(<span class="params">{<span class="keyword">default</span>: theDefault}</span>) =></span> {</span><br><span class="line"> <span class="built_in">console</span>.log(theDefault);</span><br><span class="line">});</span><br></pre></td></tr></table></figure></p>
<p>如果想同时加载<strong>多个</strong>模块，可以采用下面的写法。<br><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></pre></td><td class="code"><pre><span class="line"><span class="built_in">Promise</span>.all([</span><br><span class="line"> <span class="keyword">import</span>(<span class="string">'./module1.js'</span>),</span><br><span class="line"> <span class="keyword">import</span>(<span class="string">'./module2.js'</span>),</span><br><span class="line"> <span class="keyword">import</span>(<span class="string">'./module3.js'</span>),</span><br><span class="line">])</span><br><span class="line">.then(<span class="function">(<span class="params">[module1, module2, module3]</span>) =></span> {</span><br><span class="line"> <span class="comment">//···</span></span><br><span class="line">});</span><br></pre></td></tr></table></figure></p>
<p><code>import()</code>也可以用在<code>async</code>函数之中。<br><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">async</span> <span class="function"><span class="keyword">function</span> <span class="title">main</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="keyword">const</span> myModule = <span class="keyword">await</span> <span class="keyword">import</span>(<span class="string">'./myModule.js'</span>);</span><br><span class="line"> <span class="keyword">const</span> {export1, export2} = <span class="keyword">await</span> <span class="keyword">import</span>(<span class="string">'./myModule.js'</span>);</span><br><span class="line"> <span class="keyword">const</span> [module1, module2, module3] = <span class="keyword">await</span> <span class="built_in">Promise</span>.all([</span><br><span class="line"> <span class="keyword">import</span>(<span class="string">'./module1.js'</span>),</span><br><span class="line"> <span class="keyword">import</span>(<span class="string">'./module2.js'</span>),</span><br><span class="line"> <span class="keyword">import</span>(<span class="string">'./module3.js'</span>),</span><br><span class="line"> ]);</span><br><span class="line">}</span><br><span class="line">main();</span><br></pre></td></tr></table></figure></p>
<p>（完）<br>转自：<a href="https://blog.csdn.net/ixygj197875/article/details/79263912" target="_blank" rel="noopener">https://blog.csdn.net/ixygj197875/article/details/79263912</a><br>转自：<a href="http://www.waibo.wang/bible/es6/html/22/22.10.html" target="_blank" rel="noopener">http://www.waibo.wang/bible/es6/html/22/22.10.html</a></p>
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