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class="breadcrumbs__link">模拟题二</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">基础：New 操作符的原理</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>New 操作符的原理</h1><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="相关问题">相关问题<a href="#相关问题" class="hash-link" aria-label="Direct link to 相关问题" title="Direct link to 相关问题"></a></h2><ul><li>new 操作符做了什么</li><li>new 操作符的模拟实现</li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="回答关键点">回答关键点<a href="#回答关键点" class="hash-link" aria-label="Direct link to 回答关键点" title="Direct link to 回答关键点"></a></h2><p><code>构造函数</code> <code>对象实例</code></p><p>new 操作符通过执行自定义构造函数或内置对象构造函数，生成对应的对象实例。</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="知识点深入">知识点深入<a href="#知识点深入" class="hash-link" aria-label="Direct link to 知识点深入" title="Direct link to 知识点深入"></a></h2><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="1-new-操作符做了什么">1. new 操作符做了什么<a href="#1-new-操作符做了什么" class="hash-link" aria-label="Direct link to 1. new 操作符做了什么" title="Direct link to 1. new 操作符做了什么"></a></h3><ol><li>在内存中创建一个新对象。</li><li>将新对象内部的 <!-- -->_<!-- -->_<!-- -->proto<!-- -->_<!-- -->_<!-- --> 赋值为构造函数的 prototype 属性。</li><li>将构造函数内部的 this 被赋值为新对象（即 this 指向新对象）。</li><li>执行构造函数内部的代码（给新对象添加属性）。</li><li>如果构造函数返回非空对象，则返回该对象。否则返回 this。</li></ol><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="2-new-操作符的模拟实现">2. new 操作符的模拟实现<a href="#2-new-操作符的模拟实现" class="hash-link" aria-label="Direct link to 2. new 操作符的模拟实现" title="Direct link to 2. new 操作符的模拟实现"></a></h3><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">fakeNew</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// 创建新对象</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">var</span><span class="token plain"> obj </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token known-class-name class-name">Object</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">create</span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword null nil" style="color:#00009f">null</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">var</span><span class="token plain"> </span><span class="token maybe-class-name">Constructor</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">[</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">shift</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">call</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">arguments</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// 将对象的 __proto__ 赋值为构造函数的 prototype 属性</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> obj</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">__proto__</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token class-name">Constructor</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">prototype</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// 将构造函数内部的 this 赋值为新对象</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">var</span><span class="token plain"> ret </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token maybe-class-name">Constructor</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">apply</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">obj</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> arguments</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// 返回新对象</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">return</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">typeof</span><span class="token plain"> ret </span><span class="token operator" style="color:#393A34">===</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"object"</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">&&</span><span class="token plain"> ret </span><span class="token operator" style="color:#393A34">!==</span><span class="token plain"> </span><span class="token keyword null nil" style="color:#00009f">null</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">?</span><span class="token plain"> ret </span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> obj</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function maybe-class-name" style="color:#d73a49">Group</span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter">name</span><span class="token parameter punctuation" style="color:#393A34">,</span><span class="token parameter"> member</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">this</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">name</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> name</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">this</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">member</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> member</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">var</span><span class="token plain"> group </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">fakeNew</span><span class="token punctuation" style="color:#393A34">(</span><span class="token maybe-class-name">Group</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"hzfe"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">17</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="参考资料">参考资料<a href="#参考资料" class="hash-link" aria-label="Direct link to 参考资料" title="Direct link to 参考资料"></a></h2><ol><li><a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/new" target="_blank" rel="noopener noreferrer">new 操作符 - MDN</a></li><li><a href="https://262.ecma-international.org/5.1/#sec-11.2.2" target="_blank" rel="noopener noreferrer">The new Operator</a></li></ol></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/awesome-interview/book2/js-inherite"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">基础：ES5、ES6 如何实现继承</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/awesome-interview/book2/css-preprocessor"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">样式：谈谈 CSS 预处理器</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a 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