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JavaScript数据类型与数据结构
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<h3 id="数据类型"><a href="#数据类型" class="headerlink" title="数据类型"></a>数据类型</h3><p>什么是数据类型?<br><code>数据类型</code>(Data type)是用来<code>约束数据</code>的解释<br>JavaScript语言可以识别下面 7 种不同类型的值：<br>6 种 <code>基本数据类型(也叫原始类型)</code>:</p>
<blockquote>
<p> Boolean<br> Null<br> Undefined<br> Number<br> String<br> Symbol (ECMAScript 6 新定义)–符号类型</p>
</blockquote>
<p>基本类型的变量是存放在栈内存（Stack）里的<br>但是为什么有人说js里面一切皆为对象呢? 三种原始类型的值——数值、字符串、布尔值——在一定条件下，也会自动转为对象，也就是原始类型的<a target="_blank" rel="noopener" href="http://javascript.ruanyifeng.com/stdlib/wrapper.html">“包装对象”</a></p>
<span id="more"></span>
<p>1 种 <code>引用类型</code>:</p>
<blockquote>
<p>Object</p>
</blockquote>
<p>Object又分为以下几种类型：</p>
<ul>
<li>Function</li>
<li>Array</li>
<li>Date</li>
<li>RegExp</li>
<li>Error(ReferenceError同作用域判别失败相关,而TypeError对结果的操作是非法或不合理的)</li>
</ul>
<p>引用类型的值是保存在堆内存（Heap）中的对象（Object）<br>与其他编程语言不同，JavaScript 不能直接操作对象的内存空间（堆内存）。 </p>
<blockquote>
<p>到目前为止，我们看到的大多数引用类型值都是 Object 类型的实例；而且，Object 也是 ECMAScript 中使用最多的一个类型。虽然 Object 的实例不具备多少功能，但对于在应用程序中存储和传输数据而言，它们确实是非常理想的选择。——《JavaScript高级程序设计（第3版）》</p>
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<p> 参考<a target="_blank" rel="noopener" href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/A_re-introduction_to_JavaScript">js的数据类型</a> <a target="_blank" rel="noopener" href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript Language Types</a></p>
<h3 id="数据结构"><a href="#数据结构" class="headerlink" title="数据结构"></a>数据结构</h3><p>什么是数据结构?<br>数据结构（英语：data structure）是计算机中存储、组织数据的方式。<br>数据结构可透过程序语言所提供的数据类型、引用及其他操作加以实现<br>常见的数据结构有数组,堆栈,队列,链表,数,图,堆,散列表.</p>
<p>基于<a target="_blank" rel="noopener" href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Inheritance_and_the_prototype_chain">原型链继承</a>上讲，Javascript 只有一种结构，那就是：对象。</p>
<h3 id="常用的判断数据类型的方法"><a href="#常用的判断数据类型的方法" class="headerlink" title="常用的判断数据类型的方法"></a>常用的判断数据类型的方法</h3><p>typeof操作符返回一个字符串,指示未经计算的操作数的类型。<br><code>typeof</code>会把<code>null ,[] </code>都判断为<code>object</code><br>instanceof 运算符用来检测 constructor.prototype 是否存在于参数 object 的原型链上<br><code>instanceof</code>会把 <code>[]</code>判断为<code>object</code><br>Object.prototype.toString.call() 来获取每个对象的类型<br>经过测试 <code>Object.prototype.toString.call</code>获取类型最为准确, </p>
<h3 id="补充看到的一个笔试题"><a href="#补充看到的一个笔试题" class="headerlink" title="补充看到的一个笔试题"></a>补充看到的一个笔试题</h3> <figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">var obj={push:Array.prototype.push,length:4}; obj.push('a'); obj.length</span><br></pre></td></tr></table></figure>
<p> 问length是多少? 5; obj是什么类型? object<br> 类似问题还有</p>
<figure class="highlight plaintext"><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">var associative_array = new Array();</span><br><span class="line">associative_array["one"] = "Lorem";</span><br><span class="line">associative_array["two"] = "Ipsum";</span><br><span class="line">associative_array["three"] = "dolor";</span><br></pre></td></tr></table></figure>
<p> associative_array 的length 是多少? 0 ; associative_array是什么类型? Array.</p>
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