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<h2 id="堆栈内存的作用"><a href="#堆栈内存的作用" class="headerlink" title="堆栈内存的作用"></a><strong>堆栈内存的作用</strong></h2><p><strong>JS 中的内存堆内存和栈内存，所有堆栈内存的处理，浏览器会自行在内部执行</strong></p>
<p><strong>栈内存：</strong></p>
<ul>
<li>提供一个供 JS 代码自上而下执行的环境（作用域，代码都是在栈内存中执行的）</li>
<li>由于基本类型比较简单，它们都是直接在栈内存中开辟一个位置，直接把值存储进去的</li>
</ul>
<p><strong>堆内存：引用值对应的空间<br>存储引用类型的（对象：键值对，函数：代码字符串）</strong></p>
<h2 id="堆内存的释放"><a href="#堆内存的释放" class="headerlink" title="堆内存的释放"></a><strong>堆内存的释放</strong></h2><p><strong>让所有引用堆内存空间地址的变量赋值为 null 即可，当堆内存没有被任何的变量或者其他东西引用时，就会在浏览器执行垃圾回收的时候，被销毁掉。</strong></p>
<p><strong>堆内存释放后，里面存储的值也就会被释放掉。</strong></p>
<h2 id="栈内存的释放"><a href="#栈内存的释放" class="headerlink" title="栈内存的释放"></a><strong>栈内存的释放</strong></h2><p><strong>全局作用域会在页面关闭或者刷新的时候释放。（栈内存释放后，存储在栈内存中的值也都会销毁。<br>）<br>私有作用域：一般情况下，当函数执行完成，所形成的私有作用域（栈内存）都会自动释放掉，但是也有特殊的情况。</strong></p>
<p><strong>函数执行完成，当前形成的栈内存中，某些内容被栈内存意外的变量一直占用，此时栈内存不能释放，栈内存中存储的基本值也不会被释放，一直保存下来。最典型的就是闭包。</strong></p>
<figure class="highlight js"><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> i = <span class="number">1</span>;</span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">fn</span>(<span class="params">i</span>) </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="function"><span class="keyword">function</span>(<span class="params">n</span>) </span>{</span><br><span class="line"> <span class="built_in">console</span>.log(n + (++i));</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="keyword">var</span> f = fn(<span class="number">2</span>); <span class="comment">//=> i = 2</span></span><br><span class="line">f() <span class="comment">//=> i = 3</span></span><br><span class="line">f(<span class="number">3</span>); <span class="comment">//=>7, i = 3 n =3，执行 n + (++i) => 3 + 4 = 7</span></span><br><span class="line">fn(<span class="number">5</span>)(<span class="number">6</span>); <span class="comment">//=>12, i = 5 n = 6，执行 n + (++i) => 6 + 6 = 12</span></span><br><span class="line">fn(<span class="number">7</span>)(<span class="number">8</span>); <span class="comment">//=>16, i = 7 n = 8，执行 n + (++i) => 8 + 8 = 16</span></span><br><span class="line">f(<span class="number">4</span>); <span class="comment">//=>8, i = 3 n = 4，执行 n + (++i) => 4 + 4 = 8</span></span><br></pre></td></tr></table></figure>
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