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class="fa-fw fas fa-archive"></i><span> 归档</span></a></li><li><a class="site-page child" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></li><li><a class="site-page child" target="_blank" rel="noopener" href="https://buy.dreamlove.top/"><i class="fa-fw fas fa-heart"></i><span> 购物</span></a></li></ul></div></div><div id="toggle-menu"><a class="site-page" href="javascript:void(0);"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">浅拷贝深拷贝和个人一些新理解(非普遍的理解)</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2022-05-06T18:58:00.000Z" title="发表于 2022-05-06 18:58:00">2022-05-06</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-05-06T19:05:57.000Z" title="更新于 2022-05-06 19:05:57">2022-05-06</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/HTML/">HTML</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/HTML/javscript/">javscript</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1.5k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>5分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" data-flag-title="浅拷贝深拷贝和个人一些新理解(非普遍的理解)"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h2 id="预备知识"><a href="#预备知识" class="headerlink" title="预备知识"></a>预备知识</h2><ul><li><p>引用数据类型</p><ul><li>Object（在JS中除了基本数据类型以外的都是对象，数据是对象，函数是对象等等)</li></ul></li><li><p>基本数据类型</p><ul><li><code>Number</code>、<code>String</code>、<code>Boolean</code>、<code>Null</code>、 <code>Undefined</code>、<code>Symbol</code></li></ul></li><li><p>文章参考了牛客网<a target="_blank" rel="noopener" href="https://www.nowcoder.com/profile/599258">CodeSheep</a></p></li></ul><h2 id="赋值-vs-浅拷贝-vs-深拷贝"><a href="#赋值-vs-浅拷贝-vs-深拷贝" class="headerlink" title="赋值 vs 浅拷贝 vs 深拷贝"></a>赋值 vs 浅拷贝 vs 深拷贝</h2><h3 id="赋值-不能算是拷贝，因为拷贝的仅仅只是引用关系，并没有生成新的实际对象"><a href="#赋值-不能算是拷贝，因为拷贝的仅仅只是引用关系，并没有生成新的实际对象" class="headerlink" title="赋值(不能算是拷贝，因为拷贝的仅仅只是引用关系，并没有生成新的实际对象)"></a>赋值(不能算是拷贝，因为拷贝的仅仅只是引用关系，并没有生成新的实际对象)</h3><p>很常见的一种</p><figure class="highlight javascript"><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><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> a = <span class="number">10</span>;</span><br><span class="line"><span class="keyword">var</span> b = <span class="number">100</span>;</span><br><span class="line"><span class="keyword">var</span> obj = {</span><br><span class="line"> <span class="attr">name</span>:<span class="string">"李白"</span>,</span><br><span class="line"> <span class="attr">sex</span>:<span class="string">"男"</span></span><br><span class="line">}</span><br><span class="line"><span class="comment">// 注意,这个严格来说是赋值,不是什么浅拷贝深拷贝!后面有原因</span></span><br><span class="line"><span class="keyword">var</span> obj2 = obj;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 注意,这个严格来说是赋值,不是什么浅拷贝深拷贝</span></span><br><span class="line"><span class="title class_">Student</span> codeSheep = <span class="keyword">new</span> <span class="title class_">Student</span>();</span><br><span class="line"><span class="title class_">Student</span> codePig = codeSheep;</span><br></pre></td></tr></table></figure><p><img src="https://dreamos.oss-cn-beijing.aliyuncs.com/gitblog/20220506101754.png"></p><img src="https://dreamos.oss-cn-beijing.aliyuncs.com/gitblog/202205061954938.jpeg" style="zoom:50%"><h3 id="浅拷贝"><a href="#浅拷贝" class="headerlink" title="浅拷贝"></a>浅拷贝</h3><h4 id="一个误区"><a href="#一个误区" class="headerlink" title="一个误区"></a>一个误区</h4><p class="note-info">很多人说var objOrigin = {name:'李白'}; var objAfter = objOrigin; 是浅拷贝,严格来说是错误的!</p><figure class="highlight javascript"><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><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 严格来说是错误的!</span></span><br><span class="line"><span class="comment">// 如果说下面这一行是浅拷贝</span></span><br><span class="line"><span class="keyword">var</span> objOrigin = {<span class="attr">name</span>:<span class="string">'李白'</span>}; <span class="keyword">var</span> objAfter = objOrigin;是浅拷贝</span><br><span class="line"></span><br><span class="line"><span class="comment">//那么这个是什么?</span></span><br><span class="line"><span class="keyword">var</span> obj1 = { <span class="attr">name</span>: <span class="string">'李白'</span>, <span class="attr">sex</span>: <span class="string">'男'</span> };</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> clonedObj = { ...obj1 };</span><br><span class="line">clonedObj.<span class="property">name</span>=<span class="string">"李黑"</span>;</span><br><span class="line"></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(clonedObj); <span class="comment">// {name: '李黑', sex: '男'}</span></span><br><span class="line"></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(obj1);<span class="comment">// {name: '李白', sex: '男'}</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//可以看到,克隆后的对象将名字修改为了李黑,原来的没有变化</span></span><br></pre></td></tr></table></figure><ul><li>这里使用了展开运算符(扩展运算符),官方解释是<strong>浅拷贝</strong></li></ul><p><img src="https://dreamos.oss-cn-beijing.aliyuncs.com/gitblog/20220506103101.png"></p><ul><li><p>如果按照之前有些人的说法,下面这个是浅拷贝</p><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> objOrigin = {<span class="attr">name</span>:<span class="string">'李白'</span>}; <span class="keyword">var</span> objAfter = objOrigin;</span><br></pre></td></tr></table></figure><ul><li><p>那么<code>mdnWebDocs</code>当中的展开运算符(扩展运算符)<strong>可以实现浅拷贝</strong>,那么按道理来说这个所谓的浅拷贝,修改了浅拷贝后的对象不会导致原来的对象改变吧?那为什么修改后会发生改变?</p><figure class="highlight javascript"><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><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//var objOrigin = {name:'李白'}; var objAfter = obj;是浅拷贝</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> objOrigin = {<span class="attr">name</span>:<span class="string">'李白'</span>}; </span><br><span class="line"><span class="keyword">var</span> objAfter = objOrigin;</span><br><span class="line"><span class="comment">//修改拷贝后的对象当中的name(name为基本数据类型)</span></span><br><span class="line">objAfter.<span class="property">name</span>=<span class="string">"李黑"</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//输出为 {name: '李黑'}</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(objAfter);</span><br><span class="line"></span><br><span class="line"><span class="comment">//输出为 {name: '李黑'}</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(objOrigin);</span><br><span class="line"></span><br></pre></td></tr></table></figure></li><li><p>所以<strong>我</strong>觉得,<strong>赋值就是赋值,不是什么浅拷贝和深拷贝</strong>!不然你说<code>var objAfter = objOrigin</code>就是浅拷贝,那么为什么修改了<code>objAfter</code>后<code>objOrigin</code>也会变化?并且<strong>修改的还是对象当中的基本数据类型!(因为后面深拷贝还设计到对象当中的数据类型)</strong></p></li></ul></li></ul><h4 id="真正的浅拷贝"><a href="#真正的浅拷贝" class="headerlink" title="真正的浅拷贝"></a>真正的浅拷贝</h4><ul><li>比如我们试图通过studen1实例，拷贝得到student2，如果是浅拷贝这种方式，大致模型可以示意成如下所示的样子：</li></ul><p><img src="https://dreamos.oss-cn-beijing.aliyuncs.com/gitblog/20220506104339.png"></p><ul><li>很明显，<strong>值类型</strong>的字段会复制一份，而<strong>引用类型</strong>的字段拷贝的仅仅是引用地址，而该引用地址指向的实际对象空间其实只有一份。</li><li>所以<strong>浅拷贝</strong>是什么,就是赋值引用数据类型当中存储的基本数据类型,而引用数据类型当中的引用数据类型(<strong>比如数组当中嵌套对象的情况</strong>),仅仅只是将地址赋值给了另外一个对象!</li></ul><h3 id="深拷贝"><a href="#深拷贝" class="headerlink" title="深拷贝"></a>深拷贝</h3><ul><li>深拷贝相较于上面所示的浅拷贝，除了值类型字段会复制一份，引用类型字段所指向的对象，会在内存中也<strong>创建一个副本</strong>，就像这个样子：</li></ul><p><img src="https://dreamos.oss-cn-beijing.aliyuncs.com/gitblog/20220506104558.png"></p><ul><li>所以<strong>深拷贝</strong>是什么,就是不管对象当中嵌套了多少层引用数据类型还是基本数据类型,都建立一个新的给自己</li></ul><h2 id="一些常用的深浅拷贝方法"><a href="#一些常用的深浅拷贝方法" class="headerlink" title="一些常用的深浅拷贝方法"></a>一些常用的深浅拷贝方法</h2><h3 id="浅拷贝-1"><a href="#浅拷贝-1" class="headerlink" title="浅拷贝"></a>浅拷贝</h3><h4 id="展开运算符-扩展运算符"><a href="#展开运算符-扩展运算符" class="headerlink" title="展开运算符(扩展运算符)"></a>展开运算符(扩展运算符)</h4><ul><li>可以看到,除了基本数据类型拷贝了,里面的引用数据类型并未进行拷贝,修改一个拷贝后的引用数据类型会影响原来的</li></ul><figure class="highlight javascript"><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><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> objOrigin = {</span><br><span class="line"> <span class="attr">name</span>: <span class="string">'李白'</span>,</span><br><span class="line"> <span class="attr">sex</span>: <span class="string">'男'</span>,</span><br><span class="line"> <span class="attr">other</span>: {</span><br><span class="line"> <span class="attr">hobby</span>: <span class="string">"喝酒"</span>,</span><br><span class="line"> <span class="attr">food</span>: <span class="string">"吃肉"</span></span><br><span class="line"> }</span><br><span class="line">};</span><br><span class="line"><span class="comment">//扩展运算符浅拷贝</span></span><br><span class="line"><span class="keyword">var</span> objAfter = {</span><br><span class="line"> ...objOrigin</span><br><span class="line">}</span><br><span class="line"><span class="comment">//false</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(objAfter === objOrigin);</span><br><span class="line"></span><br><span class="line"><span class="comment">//true (浅拷贝的原因)</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(objAfter.<span class="property">other</span> === objOrigin.<span class="property">other</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">//修改</span></span><br><span class="line">objAfter.<span class="property">name</span> = <span class="string">"动感超人"</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//修改2</span></span><br><span class="line">objAfter.<span class="property">other</span>.<span class="property">food</span> = <span class="string">"蔬菜"</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//{ name: '动感超人', sex: '男', other: { hobby: '喝酒', food: '蔬菜' } }</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(objAfter);</span><br><span class="line"></span><br><span class="line"><span class="comment">// { name: '李白', sex: '男', other: { hobby: '喝酒', food: '蔬菜' } }</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(objOrigin);</span><br></pre></td></tr></table></figure><h4 id="Object-assign"><a href="#Object-assign" class="headerlink" title="Object.assign"></a>Object.assign</h4><ul><li>可以看到,除了基本数据类型拷贝了,里面的引用数据类型并未进行拷贝,修改一个拷贝后的引用数据类型会影响原来的</li></ul><figure class="highlight java"><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><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">var</span> <span class="variable">objOrigin</span> <span class="operator">=</span> {</span><br><span class="line"> name: <span class="string">'李白'</span>,</span><br><span class="line"> sex: <span class="string">'男'</span>,</span><br><span class="line"> other: {</span><br><span class="line"> hobby: <span class="string">"喝酒"</span>,</span><br><span class="line"> food: <span class="string">"吃肉"</span></span><br><span class="line"> }</span><br><span class="line">};</span><br><span class="line"><span class="comment">//Object.assign浅拷贝</span></span><br><span class="line"><span class="type">var</span> <span class="variable">objAfter</span> <span class="operator">=</span> {};</span><br><span class="line">Object.assign(objAfter,objOrigin)</span><br><span class="line"><span class="comment">//false</span></span><br><span class="line">console.log(objAfter === objOrigin);</span><br><span class="line"></span><br><span class="line"><span class="comment">//true (浅拷贝的原因)</span></span><br><span class="line">console.log(objAfter.other === objOrigin.other);</span><br><span class="line"></span><br><span class="line"><span class="comment">//修改</span></span><br><span class="line">objAfter.name = <span class="string">"动感超人"</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//修改2</span></span><br><span class="line">objAfter.other.food = <span class="string">"蔬菜"</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//{ name: '动感超人', sex: '男', other: { hobby: '喝酒', food: '蔬菜' } }</span></span><br><span class="line">console.log(objAfter);</span><br><span class="line"></span><br><span class="line"><span class="comment">// { name: '李白', sex: '男', other: { hobby: '喝酒', food: '蔬菜' } }</span></span><br><span class="line">console.log(objOrigin);</span><br></pre></td></tr></table></figure><h3 id="深拷贝-1"><a href="#深拷贝-1" class="headerlink" title="深拷贝"></a>深拷贝</h3><h4 id="JSON-stringify和JSON-parseInt实现"><a href="#JSON-stringify和JSON-parseInt实现" class="headerlink" title="JSON.stringify和JSON.parseInt实现"></a>JSON.stringify和JSON.parseInt实现</h4><ul><li>可以看到,除了基本数据类型拷贝了,里面的引用数据类型也进行了拷贝,修改一个拷贝后的引用数据类型不影响原来的</li></ul><figure class="highlight javascript"><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><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> objOrigin = {</span><br><span class="line"> <span class="attr">name</span>: <span class="string">'李白'</span>,</span><br><span class="line"> <span class="attr">sex</span>: <span class="string">'男'</span>,</span><br><span class="line"> <span class="attr">other</span>: {</span><br><span class="line"> <span class="attr">hobby</span>: <span class="string">"喝酒"</span>,</span><br><span class="line"> <span class="attr">food</span>: <span class="string">"吃肉"</span></span><br><span class="line"> }</span><br><span class="line">};</span><br><span class="line"><span class="comment">//JSON.parse和JSON.stringify 深拷贝</span></span><br><span class="line"><span class="keyword">var</span> objAfter = <span class="title class_">JSON</span>.<span class="title function_">parse</span>(<span class="title class_">JSON</span>.<span class="title function_">stringify</span>(objOrigin));</span><br><span class="line"><span class="comment">//false</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(objAfter === objOrigin);</span><br><span class="line"></span><br><span class="line"><span class="comment">//true (浅拷贝的原因)</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(objAfter.<span class="property">other</span> === objOrigin.<span class="property">other</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">//修改</span></span><br><span class="line">objAfter.<span class="property">name</span> = <span class="string">"动感超人"</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//修改2</span></span><br><span class="line">objAfter.<span class="property">other</span>.<span class="property">food</span> = <span class="string">"蔬菜"</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//{ name: '动感超人', sex: '男', other: { hobby: '喝酒', food: '蔬菜' } }</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(objAfter);</span><br><span class="line"></span><br><span class="line"><span class="comment">// { name: '李白', sex: '男', other: { hobby: '喝酒', food: '吃肉' } }</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(objOrigin);</span><br></pre></td></tr></table></figure><h4 id="lodash当中的cloneDeep"><a href="#lodash当中的cloneDeep" class="headerlink" title="lodash当中的cloneDeep"></a>lodash当中的cloneDeep</h4><p><a target="_blank" rel="noopener" href="https://www.lodashjs.com/docs/lodash.cloneDeep#_clonedeepvalue">cloneDeep当中的API地址</a></p><figure class="highlight javascript"><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><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> objects = [{ <span class="string">'a'</span>: <span class="number">1</span> }, { <span class="string">'b'</span>: <span class="number">2</span> }];</span><br><span class="line"> </span><br><span class="line"><span class="keyword">var</span> deep = _.<span class="title function_">cloneDeep</span>(objects);</span><br><span class="line"><span class="comment">//比较是否相同 返回 false</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(deep[<span class="number">0</span>] === objects[<span class="number">0</span>]);</span><br><span class="line"></span><br></pre></td></tr></table></figure></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta"><i class="fas fa-circle-user fa-fw"></i>文章作者: </span><span class="post-copyright-info"><a 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class="author-info__description">小小的字,有大大的梦想~分享我的前端学习过程,经历,错误,和一些其他折腾过程</div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">168</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">90</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">68</div></a></div><a id="card-info-btn" target="_blank" rel="noopener" href="https://github.com/superBiuBiuMan"><i class="fab fa-github"></i><span>关注下我(*￣▽￣*)</span></a><div class="card-info-social-icons is-center"><a class="social-icon" href="mailto:[email protected]" target="_blank" title="Email"><i class="fas fa-envelope" style="color:#4a7dbe"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">不断更新中,有问题请留言回复(会通过邮箱提醒~)</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E9%A2%84%E5%A4%87%E7%9F%A5%E8%AF%86"><span class="toc-number">1.</span> <span class="toc-text">预备知识</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E8%B5%8B%E5%80%BC-vs-%E6%B5%85%E6%8B%B7%E8%B4%9D-vs-%E6%B7%B1%E6%8B%B7%E8%B4%9D"><span class="toc-number">2.</span> <span class="toc-text">赋值 vs 浅拷贝 vs 深拷贝</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%B5%8B%E5%80%BC-%E4%B8%8D%E8%83%BD%E7%AE%97%E6%98%AF%E6%8B%B7%E8%B4%9D%EF%BC%8C%E5%9B%A0%E4%B8%BA%E6%8B%B7%E8%B4%9D%E7%9A%84%E4%BB%85%E4%BB%85%E5%8F%AA%E6%98%AF%E5%BC%95%E7%94%A8%E5%85%B3%E7%B3%BB%EF%BC%8C%E5%B9%B6%E6%B2%A1%E6%9C%89%E7%94%9F%E6%88%90%E6%96%B0%E7%9A%84%E5%AE%9E%E9%99%85%E5%AF%B9%E8%B1%A1"><span class="toc-number">2.1.</span> <span class="toc-text">赋值(不能算是拷贝，因为拷贝的仅仅只是引用关系，并没有生成新的实际对象)</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%B5%85%E6%8B%B7%E8%B4%9D"><span class="toc-number">2.2.</span> <span class="toc-text">浅拷贝</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E4%B8%80%E4%B8%AA%E8%AF%AF%E5%8C%BA"><span class="toc-number">2.2.1.</span> <span class="toc-text">一个误区</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E7%9C%9F%E6%AD%A3%E7%9A%84%E6%B5%85%E6%8B%B7%E8%B4%9D"><span class="toc-number">2.2.2.</span> <span class="toc-text">真正的浅拷贝</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%B7%B1%E6%8B%B7%E8%B4%9D"><span class="toc-number">2.3.</span> <span class="toc-text">深拷贝</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%B8%80%E4%BA%9B%E5%B8%B8%E7%94%A8%E7%9A%84%E6%B7%B1%E6%B5%85%E6%8B%B7%E8%B4%9D%E6%96%B9%E6%B3%95"><span class="toc-number">3.</span> <span class="toc-text">一些常用的深浅拷贝方法</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%B5%85%E6%8B%B7%E8%B4%9D-1"><span class="toc-number">3.1.</span> <span class="toc-text">浅拷贝</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%B1%95%E5%BC%80%E8%BF%90%E7%AE%97%E7%AC%A6-%E6%89%A9%E5%B1%95%E8%BF%90%E7%AE%97%E7%AC%A6"><span class="toc-number">3.1.1.</span> <span class="toc-text">展开运算符(扩展运算符)</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#Object-assign"><span class="toc-number">3.1.2.</span> <span class="toc-text">Object.assign</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%B7%B1%E6%8B%B7%E8%B4%9D-1"><span class="toc-number">3.2.</span> <span class="toc-text">深拷贝</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#JSON-stringify%E5%92%8CJSON-parseInt%E5%AE%9E%E7%8E%B0"><span class="toc-number">3.2.1.</span> <span class="toc-text">JSON.stringify和JSON.parseInt实现</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#lodash%E5%BD%93%E4%B8%AD%E7%9A%84cloneDeep"><span class="toc-number">3.2.2.</span> <span class="toc-text">lodash当中的cloneDeep</span></a></li></ol></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/50575b3e.html" title="独角数卡,打开商品列表出现Undefined variable form的解决办法"><img src="https://dreamos.oss-cn-beijing.aliyuncs.com/gitblog/202408241535616.png" onerror='this.onerror=null,this.src="/img/404.png"' alt="独角数卡,打开商品列表出现Undefined variable form的解决办法"></a><div class="content"><a class="title" href="/50575b3e.html" title="独角数卡,打开商品列表出现Undefined variable form的解决办法">独角数卡,打开商品列表出现Undefined 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