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<a href="/2020/10/01/JavaScript/JavaScript%E8%BF%90%E8%A1%8C%E6%9C%BA%E5%88%B6/" class="post-title-link" itemprop="url">JavaScript运行机制</a>
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<h2 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h2><p>本文主要讲述 JS 运行机制的相关知识点，会从以下几个点分析：</p>
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<li>首先了解进程和线程的概念</li>
<li>浏览器有哪些进程，以 chrome 为例子；主要会讲述渲染进程的相关知识点；</li>
<li>通过对 JS 引擎调用栈、宿主环境及事件循环 Event Loop 来讲述 JS的运行机制；</li>
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<h2 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h2><p>　　本文主要是对 JavaScript 的 DOM 对象做一次记录，知识点包括事件的定义、DOM 事件级别、DOM 事件模型与事件流、事件的绑定与移除、事件对象及事件委托</p>
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<h2 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h2><p>　　随着<span class="en-text"> ES6 </span>的发展，模块化在项目中的运用越来越多，接触过模块化之后，相信大家都能感受到模块化给我们带来的优势，避免命名冲突、解耦代码、高复用性、高可维护性等；在<span class="en-text"> ES6 </span>模块出现之前，社区中就有一些比较优秀的模块化的规范，如<span class="en-text"> CommonJS </span>、<span class="en-text"> AMD </span>、<span class="en-text"> CMD </span>等，甚至在更早时，为了使代码更佳的规范，也使用自执行函数 IIFE 或命名空间来规范代码，然而有些时候，我们只是看着用，但并没有去真正了解下如何用好模块化，本文将主要介绍<span class="en-text"> CommonJS </span>、<span class="en-text"> ES6 </span>规范。</p>
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<h2 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h2><p>　　不知你是否有过这样的疑问，为什么使用<span class="en-text"> let、const </span>声明的全局变量在<span class="en-text"> window </span>对象里面访问不到，而<span class="en-text"> var </span>声明的全局变量却可以？是否知道变量不同声明方式之间的区别呢？是否有疑问过，函数及<span class="en-text"> var </span>声明的变量，都可以先使用而后声明，这是因为什么呢？是否了解过变量提升呢？本文主要讲述 JavaScript 变量不同声明方式之间的区别及变量提升的知识，希望对你读有所获。</p>
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<h2 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h2><p>　　不管是在编写代码时，还是面试的时候，JavaScript 深浅拷贝这个知识点是不可或缺的；说起深浅拷贝，其实考验的是我们对 JavaScript 数据类型的理解程度，如果你对数据类型还是有似懂非懂的状态的话，我会先建议你先理解 JavaScript 数据类型后，可以参考 <a href="https://cbczed.github.io/2019/06/30/JavaScript/JavaScript%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B%E8%AF%A6%E8%A7%A3/#more" target="_blank" rel="noopener">《JavaScript数据类型详解》</a> 和 <a href="https://cbczed.github.io/2019/07/15/JavaScript/JavaScript%E5%86%85%E5%AD%98%E8%AF%A6%E8%A7%A3/#more" target="_blank" rel="noopener">《JavaScript内存详解》</a>这两篇文章，这里我们就不在过多的解释；<br>　　我们都知道 JavaScript 数据类型分为：基本数据类型和引用数据类型，对于基本数据类型而言是没有深浅拷贝的区别，我们常说的深浅拷贝都是针对于引用数据类型而言的。</p>
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<h2 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h2><p>　　<span class="en-text"> call </span>、<span class="en-text"> apply </span>、<span class="en-text"> bind </span>经常是老生长谈的话题，在面试中常常会伴随着 this 指向的问题一起出现，我在关于<a href="https://cbczed.github.io/2020/03/10/JavaScript/JavaScript%E4%B9%8Bthis%E4%B9%8B%E8%B0%9C/" target="_blank" rel="noopener">《JavaScript之this之谜》</a>一文中也提到可使用它们来改变 this 的指向，那<span class="en-text"> call </span>、<span class="en-text"> apply </span>、<span class="en-text"> bind </span>究竟是如何改变函数上下文的，我们一起来看看它们的实现原理吧！</p>
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<h2 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h2><p>　　JavaScript 中闭包无处不在，但很多时候不论是开发时还是在面试的时候，我们并未真正的理解什么是闭包，自己曾经去了解过闭包的相关定义，以为记住了概念就能理解，但实际上从未真正的理解过，每当别人询问起什么是闭包时，自己又陷入了沉思，所以自己专门写一篇闭包的知识来理解闭包的艺术，也希望可以帮助到你脱离似懂非懂的状态；当然在学习闭包之前，你需要对 JavaScript 的作用域有写概念，有助于你更容易的理解闭包，若是不了解 JavaScript 的作用域，建议你先学习下，再学习闭包的知识，可以参考我的 <a href="https://cbczed.github.io/2019/11/10/JavaScript/JavaScript%E4%BD%9C%E7%94%A8%E5%9F%9F%E5%8F%8A%E6%89%A7%E8%A1%8C%E4%B8%8A%E4%B8%8B%E6%96%87%E6%A0%88/" target="_blank" rel="noopener">《JavaScript作用域及执行上下文》</a> 一文；接下来，我们一起来感受闭包的艺术吧！</p>
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<h2 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h2><p>　　什么是<span class="en-text"> Promise </span>，什么又是<span class="en-text"> Promise/A+ </span> 规范，自己对这两个问题一直都没有理解明白，所以自己专门想写篇关于<span class="en-text"> Promise </span>的文章来加深对<span class="en-text"> Promise </span>的理解；本文的主要内容是讲述<span class="en-text"> Promise </span>的实现原理，若想了解<span class="en-text"> Promise </span>的详细用法，请移步阮一峰老师<a href="https://es6.ruanyifeng.com/#docs/promise" target="_blank" rel="noopener">ES6 Promise</a>的教程。</p>
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<h2 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h2><p>　　在 JavaScript 中<span class="en-text"> this </span>的指代常常是令人头疼的一个问题，不同于其他语言，如 Java 等面向对象的语言中，<span class="en-text"> this </span>的含义是明确且具体的，即指代当前的对象，而在 JavaScript 中<span class="en-text"> this </span>是动态绑定的或者称运行时绑定的，这就给<span class="en-text"> this </span>关键字带来多重的含义，虽然这可能是 JavaScript 作为灵活性语言的标志，但同时也给我们带来了不少困惑，本文将带你揭开 JavaScript 中<span class="en-text"> this </span>的迷底，让你不在深陷其谭。</p>
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<span id="/2020/02/23/JavaScript/JavaScript%E6%89%A7%E8%A1%8C%E6%9C%BA%E5%88%B6/" class="post-meta-item leancloud_visitors" data-flag-title="JavaScript执行机制" title="阅读次数">
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<h2 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h2><p>　　从一诞生起，JavaScript就是一门<strong>单线程</strong>的语言；因为从其的用途来看，作为浏览器的脚本语言，JavaScript的主要用途是与用户交互，以及操作DOM，这就决定了其是单线程的，否则就会代理复杂的问题，比如，假定JavaScript同时有两个线程，一个线程在某个 DOM 节点上添加内容，另一个线程删除了这个节点，这时浏览器应该以哪个线程为准呢？<br>　　单线程的理解是一行一行的执行代码，那 JavaScript 的异步编程又是如何实现的呢？本文基于浏览器的执行环境介绍JavaScript的执行机制，揭开JavaScript代码执行的真面目。</p>
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