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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
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<link rel="stylesheet" href="/lib/font-awesome/css/all.min.css">
<script id="hexo-configurations">
var NexT = window.NexT || {};
var CONFIG = {"hostname":"example.com","root":"/","scheme":"Muse","version":"7.8.0","exturl":false,"sidebar":{"position":"left","display":"post","padding":18,"offset":12,"onmobile":false},"copycode":{"enable":false,"show_result":false,"style":null},"back2top":{"enable":true,"sidebar":false,"scrollpercent":false},"bookmark":{"enable":false,"color":"#222","save":"auto"},"fancybox":false,"mediumzoom":false,"lazyload":false,"pangu":false,"comments":{"style":"tabs","active":null,"storage":true,"lazyload":false,"nav":null},"algolia":{"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"}},"localsearch":{"enable":false,"trigger":"auto","top_n_per_article":1,"unescape":false,"preload":false},"motion":{"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}}};
</script>
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<meta property="article:author" content="John Doe">
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// https://hexo.io/docs/variables.html
CONFIG.page = {
sidebar: "",
isHome : true,
isPost : false,
lang : 'en'
};
</script>
<title>Hexo</title>
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<style>
.use-motion .brand,
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.use-motion .collection-header { opacity: initial; }
.use-motion .site-title,
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opacity: initial;
top: initial;
}
.use-motion .logo-line-before i { left: initial; }
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<span class="post-meta-item-text">Edited on</span>
<time title="Modified: 2024-11-24 12:12:21" itemprop="dateModified" datetime="2024-11-24T12:12:21+08:00">2024-11-24</time>
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<h1 id="分享"><a href="#分享" class="headerlink" title="分享"></a>分享</h1><h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><h3 id="因为一些地方学习不到位的原因，我在这个实习期间学习js碰到了很多问题，然后这一周本来想把这些都补补，但无奈和这个辩论队的任务重合，让我这个又准备不好辩论内容，又没时间把js上的问题逐一解决，只好用仅剩的时间从一开始的问题入手，把后面一些没有学扎实的内容它们的学习分到了下周去，然后分享的话就把这个最初遇到的原型链的问题和this指向的问题说说。"><a href="#因为一些地方学习不到位的原因，我在这个实习期间学习js碰到了很多问题，然后这一周本来想把这些都补补，但无奈和这个辩论队的任务重合，让我这个又准备不好辩论内容，又没时间把js上的问题逐一解决，只好用仅剩的时间从一开始的问题入手，把后面一些没有学扎实的内容它们的学习分到了下周去，然后分享的话就把这个最初遇到的原型链的问题和this指向的问题说说。" class="headerlink" title="因为一些地方学习不到位的原因，我在这个实习期间学习js碰到了很多问题，然后这一周本来想把这些都补补，但无奈和这个辩论队的任务重合，让我这个又准备不好辩论内容，又没时间把js上的问题逐一解决，只好用仅剩的时间从一开始的问题入手，把后面一些没有学扎实的内容它们的学习分到了下周去，然后分享的话就把这个最初遇到的原型链的问题和this指向的问题说说。"></a>因为一些地方学习不到位的原因，我在这个实习期间学习js碰到了很多问题，然后这一周本来想把这些都补补，但无奈和这个辩论队的任务重合，让我这个又准备不好辩论内容，又没时间把js上的问题逐一解决，只好用仅剩的时间从一开始的问题入手，把后面一些没有学扎实的内容它们的学习分到了下周去，然后分享的话就把这个最初遇到的原型链的问题和this指向的问题说说。</h3><h2 id="java-script中的几条链和this指向"><a href="#java-script中的几条链和this指向" class="headerlink" title="java script中的几条链和this指向"></a>java script中的几条链和this指向</h2><h2 id="1-js中的原型链"><a href="#1-js中的原型链" class="headerlink" title="1.js中的原型链"></a>1.js中的原型链</h2><p>js中对象这种引用数据类型十分常用，并且在面向对象编程时往往发挥关键作用。js可以进行面向过程的编程和面向对象编程的语言，其中js面向对象编程通过原型来实现。</p>
<p>构造函数时，实例化的成员会携带一个proto指向构造出的函数的原型对象，也就是指向了它的“父亲”的原型对象，它的父亲的原型对象，也有一个proto指向了Object的原型对象，然后Object的原型对象里也有一个proto指向了null，这个是原型链。</p>
<p>原型和原型链的意义是：使得 JavaScript 可以实现继承和代码复用。通过原型继承，可以从已有的对象创建新的对象，并且可以在新对象上添加、修改或删除属性和方法，达到代码复用和扩展的目的。原型链则使得 JavaScript 中的对象可以通过原型链向上查找属性和方法，这样就可以实现属性和方法的继承，减少重复代码的编写。</p>
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<p>Welcome to <a target="_blank" rel="noopener" href="https://hexo.io/">Hexo</a>! This is your very first post. Check <a target="_blank" rel="noopener" href="https://hexo.io/docs/">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a target="_blank" rel="noopener" href="https://hexo.io/docs/troubleshooting.html">troubleshooting</a> or you can ask me on <a target="_blank" rel="noopener" href="https://github.com/hexojs/hexo/issues">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 target="_blank" rel="noopener" href="https://hexo.io/docs/writing.html">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 target="_blank" rel="noopener" href="https://hexo.io/docs/server.html">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 target="_blank" rel="noopener" href="https://hexo.io/docs/generating.html">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 target="_blank" rel="noopener" href="https://hexo.io/docs/one-command-deployment.html">Deployment</a></p>
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