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手写Promise笔记
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<div class="post-body" itemprop="articleBody"><p>手写<code>Promise</code>笔记</p>
<span id="more"></span>
<p>掘金上看见一个<code>20</code>行的<code>Promise</code>实现，主要是链式调用，感觉很不错，学习学习。</p>
<p>原文出处：<a target="_blank" rel="noopener" href="https://juejin.im/post/5e6f4579f265da576429a907">最简实现Promise，支持异步链式调用（20行）</a></p>
<h1 id="Promise"><a href="#Promise" class="headerlink" title="Promise"></a><code>Promise</code></h1><p>直接上代码吧。</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><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></pre></td><td class="code"><pre><span class="line"><span class="comment">// Promise构造函数</span></span><br><span class="line"><span class="keyword">function</span> <span class="title function_">Promise</span>(<span class="params">excutor</span>) {</span><br><span class="line"> <span class="keyword">var</span> self = <span class="variable language_">this</span>;</span><br><span class="line"> self.<span class="property">onResolvedCallback</span> = [];</span><br><span class="line"> <span class="keyword">function</span> <span class="title function_">resolve</span>(<span class="params">value</span>) {</span><br><span class="line"> <span class="built_in">setTimeout</span>(<span class="function">() =></span> {</span><br><span class="line"> self.<span class="property">data</span> = value;</span><br><span class="line"> self.<span class="property">onResolvedCallback</span>.<span class="title function_">forEach</span>(<span class="function"><span class="params">callback</span> =></span> <span class="title function_">callback</span>(value));</span><br><span class="line"> },<span class="number">0</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="title function_">excutor</span>(resolve.<span class="title function_">bind</span>(self));</span><br><span class="line">}</span><br><span class="line"><span class="comment">// Promise的then调用函数</span></span><br><span class="line"><span class="title class_">Promise</span>.<span class="property"><span class="keyword">prototype</span></span>.<span class="property">then</span> = <span class="keyword">function</span>(<span class="params">onResolved</span>) {</span><br><span class="line"> <span class="keyword">var</span> self = <span class="variable language_">this</span>;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">Promise</span>(<span class="function"><span class="params">resolve</span> =></span> {</span><br><span class="line"> self.<span class="property">onResolvedCallback</span>.<span class="title function_">push</span>(<span class="keyword">function</span>(<span class="params"></span>) {</span><br><span class="line"> <span class="keyword">var</span> result = <span class="title function_">onResolved</span>(self.<span class="property">data</span>);</span><br><span class="line"> <span class="keyword">if</span> (result <span class="keyword">instanceof</span> <span class="title class_">Promise</span>) {</span><br><span class="line"> result.<span class="title function_">then</span>(resolve);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="title function_">resolve</span>(result);</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line"> })</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>参数<code>excutor</code>为一个函数，这个函数有两个参数。</p>
<p>一个是<code>resolve</code>，一个是<code>reject</code>，这个实现为简单实现，所以没有第二个参数，主要为实现链式调用。</p>
<p><code>Promise</code>构造函数中的<code>onResolvedCallback</code>为一个待调用的函数数组。</p>
<p>当通过<code>then</code>函数注册回调的时候，会把回调函数存在<code>onResolvedCallback</code>数组中。</p>
<p><code>then</code>函数规范中有提到，必须返回一个新的<code>Promise</code>对象，基于这个可以实现链式调用。</p>
<p><code>then</code>如何返回也在规范中有提及，如果回调函数返回了一个<code>Promise</code>，那么<code>then</code>返回的<code>Promise</code>就要使用函数返回的<code>Promise</code>的值（<code>value</code>）。</p>
<p>如果不是函数返回的不是<code>Promise</code>，那么<code>then</code>返回的<code>Promise</code>就直接以这个值来解决。</p>
<p><code>resolve</code>函数是一个完成函数，会把<code>Promise</code>的状态从<code>pending</code>转为<code>resolved</code>，并且调用全部注册的回调。</p>
<p><code>resolve</code>为啥要通过<code>setTimeout</code>调用呢？可以看下面的代码。</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> promise = <span class="keyword">new</span> <span class="title class_">Promise</span>(<span class="keyword">function</span>(<span class="params">resolve,reject</span>) {</span><br><span class="line"> <span class="title function_">resolve</span>(<span class="string">'success'</span>);</span><br><span class="line">});</span><br><span class="line"><span class="comment">// 上面的操作就已经调用了数组中的回调</span></span><br><span class="line"><span class="comment">// 下面的注册的回调就会无效了</span></span><br><span class="line">promise.<span class="title function_">then</span>(<span class="function"><span class="params">res</span>=></span>{</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(res);</span><br><span class="line">});</span><br></pre></td></tr></table></figure>
<p>我们构建了一个<code>promise</code>，直接的将这个<code>promise</code>解决掉（调用<code>resolve</code>）。</p>
<p><code>resolve</code>会把<code>onResolvedCallback</code>的函数逐一地执行。</p>
<p>注意，这时候的操作都是同步的，也就是这时的<code>then</code>注册回调还没有执行，导致了<code>then</code>方法没有被执行。</p>
<p>使用了<code>setTimeout</code>，使得更改状态以一个新的任务执行，也就是在当前代码执行完之后再执行，使得回调函数可以注册到<code>onResolvedCallback</code>里面。使得<code>then</code>的表现正常。</p>
<p>需要注意，<code>Promise</code>应该是以微任务的形式来进行<code>resolve</code>的，而不是以任务，这个在之前的关于<code>task</code>，<code>microtask</code>的文章中有说到。</p>
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