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</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">if</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">left </span><span class="token operator" style="color:#393A34">===</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">-</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">||</span><span class="token plain"> right </span><span class="token operator" style="color:#393A34">===</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">-</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">||</span><span class="token plain"> </span><span class="token known-class-name class-name">Math</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">abs</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">left </span><span class="token operator" style="color:#393A34">-</span><span class="token plain"> right</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">&gt;</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</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></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 operator" style="color:#393A34">-</span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></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></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block">
</span></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 known-class-name class-name">Math</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">max</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">left</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> right</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">+</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">;</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithHideOnScrollNavbar_3R7-" id="时间复杂度分析-1"></a>时间复杂度分析<a class="hash-link" href="#时间复杂度分析-1" title="Direct link to heading">#</a></h4><p>由于是后序遍历,每个节点只会被调用 1 次,所以,该方法的时间复杂度是 O(n)。</p><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithHideOnScrollNavbar_3R7-" id="空间复杂度分析-1"></a>空间复杂度分析<a class="hash-link" href="#空间复杂度分析-1" title="Direct link to heading">#</a></h4><p>该方法由于使用了递归,并且每次递归都调用了两次自身,导致会函数栈会按照等差数列开辟,所以该方法的空间复杂度应为 O(n^2)。</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/awesome-interview/book1/coding-promise"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« 编码:实现一个 Promises/A+</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/awesome-interview/book1/topic-enter-url-display-xx"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">综合:浏览器从输入网址到页面展现的过程 »</div></a></div></nav></div></div><div class="col col--3"><div class="tableOfContents_35-E thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#题目描述" class="table-of-contents__link">题目描述</a></li><li><a href="#基本知识点" class="table-of-contents__link">基本知识点</a></li><li><a href="#题解" class="table-of-contents__link">题解</a><ul><li><a href="#解法一" class="table-of-contents__link">解法一</a></li><li><a href="#解法二" class="table-of-contents__link">解法二</a></li></ul></li></ul></div></div></div><div class="row"><div class="col"><div class="react-utterences"><div>Loading script...</div></div></div><div class="col col--3"></div></div></div></main></div></div></div>
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</span></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"> obj</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block">
</span></span><span class="token-line" style="color:#393A34"><span class="token plain">module</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">exports</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token known-class-name class-name">Promise</span><span class="token punctuation" style="color:#393A34">;</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><h3><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithHideOnScrollNavbar_3R7-" id="2-运行命令"></a>2. 运行命令<a class="hash-link" href="#2-运行命令" title="Direct link to heading">#</a></h3><div class="codeBlockContainer_K1bP"><div class="codeBlockContent_hGly bash"><pre tabindex="0" class="prism-code language-bash codeBlock_23N8 thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_39YC"><span class="token-line" style="color:#393A34"><span class="token plain">$ npx promises-aplus-tests test.js</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><h3><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithHideOnScrollNavbar_3R7-" id="3-测试结果"></a>3. 测试结果<a class="hash-link" href="#3-测试结果" title="Direct link to heading">#</a></h3><p><img src="https://user-images.githubusercontent.com/17525377/125480978-5e2eaa69-0be4-4f8e-a321-c8e58af6a415.png" alt="测试结果"></p><p>完美通过!</p><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithHideOnScrollNavbar_3R7-" id="参考资料"></a>参考资料<a class="hash-link" href="#参考资料" title="Direct link to heading">#</a></h2><ol><li><a href="https://promisesaplus.com/" target="_blank" rel="noopener noreferrer">Promises/A+</a></li><li><a href="https://github.com/promises-aplus/promises-tests" target="_blank" rel="noopener noreferrer">Promises/A+ Compliance Test Suite</a></li></ol></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/awesome-interview/book1/network-security"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« 网络:前端安全</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/awesome-interview/book1/algorithm-balanced-binary-trees"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">算法:平衡二叉树 »</div></a></div></nav></div></div><div class="col col--3"><div class="tableOfContents_35-E thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#编写代码" class="table-of-contents__link">编写代码</a><ul><li><a href="#1-基础框架" class="table-of-contents__link">1. 基础框架</a></li><li><a href="#2-then-方法" class="table-of-contents__link">2. then 方法</a></li><li><a href="#3-promise-处理程序" class="table-of-contents__link">3. Promise 处理程序</a></li><li><a href="#4-完整代码" class="table-of-contents__link">4. 完整代码</a></li></ul></li><li><a href="#测试代码" class="table-of-contents__link">测试代码</a><ul><li><a href="#1-暴露一个简单的适配器接口" class="table-of-contents__link">1. 暴露一个简单的适配器接口</a></li><li><a href="#2-运行命令" class="table-of-contents__link">2. 运行命令</a></li><li><a href="#3-测试结果" class="table-of-contents__link">3. 测试结果</a></li></ul></li><li><a href="#参考资料" class="table-of-contents__link">参考资料</a></li></ul></div></div></div><div class="row"><div class="col"><div class="react-utterences"><div>Loading script...</div></div></div><div class="col col--3"></div></div></div></main></div></div></div>
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</span></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"> baz </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">foo</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 plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">baz</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 plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// hzfe</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><p>在这个例子中,函数 bar 作为返回值返回后,在自己定义的词法作用域以外的地方执行。一般来说,在函数 foo 执行后,通常会期待函数 foo 的整个内部作用域被引擎回收机制销毁。而闭包可以阻止这件事情的发生。事实上内部作用域依然存在,因为函数 bar 本身在使用,所以并不会被回收。</p><p>在 JavaScript 中,<strong>每当创建一个函数,闭包就会在函数创建的同时被创建出来</strong></p><h3><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithHideOnScrollNavbar_3R7-" id="3-闭包的应用"></a>3. 闭包的应用<a class="hash-link" href="#3-闭包的应用" title="Direct link to heading">#</a></h3><p>无论何时何地,如果<strong>将函数作为返回值,就会看到闭包在这些函数中的应用</strong>。在定时器事件监听器ajax 请求跨窗口通信web workers 或者任何其他的异步/同步任务中,只要<strong>使用了回调函数,实际上就是使用闭包</strong>。使用闭包的例子可以参考<a href="/awesome-interview/book2/coding-throttle-debounce">实现节流防抖函数</a></p><p><strong>TIPS: 闭包与执行函数关系</strong></p><div class="codeBlockContainer_K1bP"><div class="codeBlockContent_hGly javascript"><pre tabindex="0" class="prism-code language-javascript codeBlock_23N8 thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_39YC"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">var</span><span class="token plain"> a </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;hzfe&quot;</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token constant" style="color:#36acaa">IIFE</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></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token console class-name">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">a</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><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 punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><p>通常认为立即执行函数IIFE是典型的观察闭包的典型例子但严格来说并不是。<strong>虽然创建了闭包,但没有体现出闭包的作用</strong>。因为函数并不是在它本身的词法作用域以外执行的。
它在定义时所在的作用域中执行,而非外部作用域。</p><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithHideOnScrollNavbar_3R7-" id="参考资料"></a>参考资料<a class="hash-link" href="#参考资料" title="Direct link to heading">#</a></h2><ol><li><a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Closures" target="_blank" rel="noopener noreferrer">闭包 MDN</a></li><li><a href="/awesome-interview/book2/browser-garbage">垃圾回收机制</a></li><li><a href="https://github.com/getify/You-Dont-Know-JS" target="_blank" rel="noopener noreferrer">你不知道的 JavaScript上卷</a></li><li><a href="https://zh.wikipedia.org/wiki/%E9%97%AD%E5%8C%85_(%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%A7%91%E5%AD%A6)" target="_blank" rel="noopener noreferrer">维基百科-闭包</a></li></ol></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/awesome-interview/book1/frame-vue-computed-watch"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« 框架Vue 的 computed 和 watch 的区别</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/awesome-interview/book1/js-module-specs"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">基础:前端模块化规范 »</div></a></div></nav></div></div><div class="col col--3"><div class="tableOfContents_35-E thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#相关问题" class="table-of-contents__link">相关问题</a></li><li><a href="#回答关键点" class="table-of-contents__link">回答关键点</a></li><li><a href="#知识点深入" class="table-of-contents__link">知识点深入</a><ul><li><a href="#1-作用域" class="table-of-contents__link">1. 作用域</a></li><li><a href="#2-什么是闭包" class="table-of-contents__link">2. 什么是闭包</a></li><li><a href="#3-闭包的应用" class="table-of-contents__link">3. 闭包的应用</a></li></ul></li><li><a href="#参考资料" class="table-of-contents__link">参考资料</a></li></ul></div></div></div><div class="row"><div class="col"><div class="react-utterences"><div>Loading script...</div></div></div><div class="col col--3"></div></div></div></main></div></div></div>
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</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">let</span><span class="token plain"> self </span><span class="token operator" style="color:#393A34">=</span><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 plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">let</span><span class="token plain"> args </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> arguments</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block">
</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> timer </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">setTimeout</span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">function</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 plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"> func</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">self</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> args</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"> timer </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 punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> wait</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/awesome-interview/book2/network-http-cache"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« 网络HTTP 缓存机制</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/awesome-interview/book2/algorithm-reverse-linked-list"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">算法:反转链表 »</div></a></div></nav></div></div><div class="col col--3"><div class="tableOfContents_35-E thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#节流" class="table-of-contents__link">节流</a><ul><li><a href="#1-基本概念" class="table-of-contents__link">1. 基本概念</a></li><li><a href="#2-应用场景" class="table-of-contents__link">2. 应用场景</a></li><li><a href="#3-流程图" class="table-of-contents__link">3. 流程图</a></li><li><a href="#4-编写代码" class="table-of-contents__link">4. 编写代码</a></li></ul></li><li><a href="#去抖" class="table-of-contents__link">去抖</a><ul><li><a href="#1-基本概念-1" class="table-of-contents__link">1. 基本概念</a></li><li><a href="#2-应用场景-1" class="table-of-contents__link">2. 应用场景</a></li><li><a href="#3-流程图-1" class="table-of-contents__link">3. 流程图</a></li><li><a href="#4-编写代码-1" class="table-of-contents__link">4. 编写代码</a></li></ul></li></ul></div></div></div><div class="row"><div class="col"><div class="react-utterences"><div>Loading script...</div></div></div><div class="col col--3"></div></div></div></main></div></div></div>
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</span></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></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></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></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></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block">
</span></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">&quot;hzfe&quot;</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></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithHideOnScrollNavbar_3R7-" id="参考资料"></a>参考资料<a class="hash-link" href="#参考资料" title="Direct link to heading">#</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"><div class="pagination-nav__item"><a class="pagination-nav__link" 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></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" 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></div></nav></div></div><div class="col col--3"><div class="tableOfContents_35-E thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#相关问题" class="table-of-contents__link">相关问题</a></li><li><a href="#回答关键点" class="table-of-contents__link">回答关键点</a></li><li><a href="#知识点深入" class="table-of-contents__link">知识点深入</a><ul><li><a href="#1-new-操作符做了什么" class="table-of-contents__link">1. new 操作符做了什么</a></li><li><a href="#2-new-操作符的模拟实现" class="table-of-contents__link">2. new 操作符的模拟实现</a></li></ul></li><li><a href="#参考资料" class="table-of-contents__link">参考资料</a></li></ul></div></div></div><div class="row"><div class="col"><div class="react-utterences"><div>Loading script...</div></div></div><div class="col col--3"></div></div></div></main></div></div></div>
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</span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">/* 可能有内存泄漏的代码片段 start */</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// code</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">/* 可能有内存泄漏的代码片段 end */</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block">
</span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">capture</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></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithHideOnScrollNavbar_3R7-" id="参考资料"></a>参考资料<a class="hash-link" href="#参考资料" title="Direct link to heading">#</a></h2><ol><li><a href="https://developer.chrome.com/docs/devtools/" target="_blank" rel="noopener noreferrer">Chrome DevTools</a></li><li><a href="https://developer.chrome.com/docs/devtools/memory-problems/" target="_blank" rel="noopener noreferrer">Fix memory problems</a></li></ol></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/awesome-interview/book3/browser-event-loop"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« 浏览器:浏览器事件循环</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/awesome-interview/book3/engineer-webpack-loader"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">工程化:谈下 webpack loader 的机制 »</div></a></div></nav></div></div><div class="col col--3"><div class="tableOfContents_35-E thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#相关问题" class="table-of-contents__link">相关问题</a></li><li><a href="#回答关键点" class="table-of-contents__link">回答关键点</a></li><li><a href="#知识点深入" class="table-of-contents__link">知识点深入</a><ul><li><a href="#1-排查内存泄漏常见问题" class="table-of-contents__link">1. 排查内存泄漏常见问题</a></li><li><a href="#2-使用-chrome-devtools-定位内存泄漏" class="table-of-contents__link">2. 使用 Chrome DevTools 定位内存泄漏</a></li><li><a href="#3-nodejs-中的内存泄漏定位" class="table-of-contents__link">3. Node.js 中的内存泄漏定位</a></li></ul></li><li><a href="#参考资料" class="table-of-contents__link">参考资料</a></li></ul></div></div></div><div class="row"><div class="col"><div class="react-utterences"><div>Loading script...</div></div></div><div class="col col--3"></div></div></div></main></div></div></div>
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</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">if</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">parentId </span><span class="token operator" style="color:#393A34">===</span><span class="token plain"> rootId</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></span><span class="token-line" style="color:#393A34"><span class="token plain"> root</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">push</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">newItem</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></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><span class="token keyword control-flow" style="color:#00009f">else</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">if</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token operator" style="color:#393A34">!</span><span class="token plain">record</span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">parentId</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></span><span class="token-line" style="color:#393A34"><span class="token plain"> record</span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">parentId</span><span class="token punctuation" style="color:#393A34">]</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 plain"></span></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></span><span class="token-line" style="color:#393A34"><span class="token plain"> record</span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">parentId</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">push</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">newItem</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></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></span><span class="token-line" style="color:#393A34"><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 plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block">
</span></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"> root</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><p>时间复杂度分析:经历了一轮迭代,假设有 n 个元素,那么时间复杂度为 O(n)。</p><h3><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithHideOnScrollNavbar_3R7-" id="代码演示及总结"></a>代码演示及总结<a class="hash-link" href="#代码演示及总结" title="Direct link to heading">#</a></h3><p><a href="https://codesandbox.io/s/practical-sun-vo4yi?file=/src/App.js" target="_blank" rel="noopener noreferrer">Code Sandbox - List to Tree</a></p><ul><li>递归法:在数据量增大的时候,性能会急剧下降。好处是可以在构建树的过程中,给节点添加层级信息。</li><li>迭代法:速度快。但如果想要不影响源数据,需要在 record 中存储一份复制的数据,且无法在构建的过程中得知节点的层级信息,需要构建完后再次深度优先遍历获取。</li><li>迭代法变体一:按需创建 children可以避免空的 children 列表。</li></ul></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/awesome-interview/book3/network-http-1-2"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« 网络HTTP2 和 HTTP1.1 的对比</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/awesome-interview/book3/algorithm-binary-tree-k"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">算法:二叉搜索树的第 k 个结点 »</div></a></div></nav></div></div><div class="col col--3"><div class="tableOfContents_35-E thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#典型题目" class="table-of-contents__link">典型题目</a></li><li><a href="#解法" class="table-of-contents__link">解法</a><ul><li><a href="#解法一" class="table-of-contents__link">解法一</a></li><li><a href="#解法二" class="table-of-contents__link">解法二</a></li><li><a href="#解法二变体" class="table-of-contents__link">解法二变体</a></li><li><a href="#代码演示及总结" class="table-of-contents__link">代码演示及总结</a></li></ul></li></ul></div></div></div><div class="row"><div class="col"><div class="react-utterences"><div>Loading script...</div></div></div><div class="col col--3"></div></div></div></main></div></div></div>
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</span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> hzfe</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token maybe-class-name">IHzfe</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 plain"> name</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;HZFE&quot;</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> member</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">17</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">;</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithHideOnScrollNavbar_3R7-" id="23-动态属性"></a>2.3 动态属性<a class="hash-link" href="#23-动态属性" title="Direct link to heading">#</a></h4><p>Type 可以使用 in 关键字动态生成属性,而 Interface 的索引值必须是 string 或 number 类型,所以 Interface 并不支持动态生成属性。</p><div class="codeBlockContainer_K1bP"><div class="codeBlockContent_hGly typescript"><pre tabindex="0" class="prism-code language-typescript codeBlock_23N8 thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_39YC"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">type</span><span class="token plain"> </span><span class="token class-name maybe-class-name">HZFELanguage</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;JavaScript&quot;</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">|</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;Go&quot;</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">type</span><span class="token plain"> </span><span class="token class-name maybe-class-name">HZFEProjects</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 plain"></span></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">key </span><span class="token keyword" style="color:#00009f">in</span><span class="token plain"> </span><span class="token maybe-class-name">HZFELanguage</span><span class="token punctuation" style="color:#393A34">]</span><span class="token operator" style="color:#393A34">?</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token builtin">string</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 plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block">
</span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> hzfeProjects</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token maybe-class-name">HZFEProjects</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 plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token maybe-class-name">JavaScript</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 string" style="color:#e3116c">&quot;xx&quot;</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;xx&quot;</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">;</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithHideOnScrollNavbar_3R7-" id="参考资料"></a>参考资料<a class="hash-link" href="#参考资料" title="Direct link to heading">#</a></h2><ol><li><a href="https://www.typescriptlang.org/" target="_blank" rel="noopener noreferrer">TypScript - Typed JavaScript at Any Scale</a></li></ol></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/awesome-interview/book3/js-async"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« 基础JavaScript 异步编程</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/awesome-interview/book3/css-mobile-adaptive"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">样式:移动端自适应的常见手段 »</div></a></div></nav></div></div><div class="col col--3"><div class="tableOfContents_35-E thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#相关问题" class="table-of-contents__link">相关问题</a></li><li><a href="#回答关键点" class="table-of-contents__link">回答关键点</a></li><li><a href="#知识点深入" class="table-of-contents__link">知识点深入</a><ul><li><a href="#1-interface-和-type-的相同点" class="table-of-contents__link">1. Interface 和 Type 的相同点</a></li><li><a href="#2-interface-和-type-的不同点" class="table-of-contents__link">2. Interface 和 Type 的不同点</a></li></ul></li><li><a href="#参考资料" class="table-of-contents__link">参考资料</a></li></ul></div></div></div><div class="row"><div class="col"><div class="react-utterences"><div>Loading script...</div></div></div><div class="col col--3"></div></div></div></main></div></div></div>
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## 适合人群
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## CHANGELOG
#### 2021/09/30
- 更新 algolia 搜索插件
- 添加机器人账号
#### 2021/09/21
- 修复部分 issue 中提的 bug

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