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  25.     <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>初识 TypeScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TypeScript 常用语法</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p 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collapsable depth-0"><p class="sidebar-heading open"><span>ts-axios 取消功能实现</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/blog/pages/fdc6da5372397430/" aria-current="page" class="active sidebar-link">取消功能的设计与实现</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/fdc6da5372397430/#需求分析" class="sidebar-link">需求分析</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/fdc6da5372397430/#异步分离的设计方案" class="sidebar-link">异步分离的设计方案</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/fdc6da5372397430/#canceltoken-类实现" class="sidebar-link">CancelToken 类实现</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/blog/pages/fdc6da5372397430/#接口定义" class="sidebar-link">接口定义</a></li><li class="sidebar-sub-header level3"><a href="/blog/pages/fdc6da5372397430/#代码实现" class="sidebar-link">代码实现</a></li></ul></li><li class="sidebar-sub-header level2"><a href="/blog/pages/fdc6da5372397430/#canceltoken-扩展静态接口" class="sidebar-link">CancelToken 扩展静态接口</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/blog/pages/fdc6da5372397430/#接口定义-2" class="sidebar-link">接口定义</a></li><li class="sidebar-sub-header level3"><a href="/blog/pages/fdc6da5372397430/#代码实现-2" class="sidebar-link">代码实现</a></li></ul></li><li class="sidebar-sub-header level2"><a href="/blog/pages/fdc6da5372397430/#cancel-类实现及-axios-的扩展" class="sidebar-link">Cancel 类实现及 axios 的扩展</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/blog/pages/fdc6da5372397430/#接口定义-3" class="sidebar-link">接口定义</a></li><li class="sidebar-sub-header level3"><a href="/blog/pages/fdc6da5372397430/#代码实现-3" class="sidebar-link">代码实现</a></li></ul></li><li class="sidebar-sub-header level2"><a href="/blog/pages/fdc6da5372397430/#额外逻辑实现" class="sidebar-link">额外逻辑实现</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/fdc6da5372397430/#demo-编写" class="sidebar-link">demo 编写</a></li></ul></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 更多功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 单元测试</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 部署与发布</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-06225672><div class="articleInfo" data-v-06225672><ul class="breadcrumbs" data-v-06225672><li data-v-06225672><a href="/blog/" title="首页" class="iconfont icon-home router-link-active" data-v-06225672></a></li> <li data-v-06225672><a href="/blog/note/typescript-axios/#《TypeScript 从零实现 axios》" data-v-06225672>《TypeScript 从零实现 axios》</a></li><li data-v-06225672><a href="/blog/note/typescript-axios/#ts-axios 取消功能实现" data-v-06225672>ts-axios 取消功能实现</a></li></ul> <div class="info" data-v-06225672><div title="作者" class="author iconfont icon-touxiang" data-v-06225672><a href="javascript:;" data-v-06225672>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06225672><a href="javascript:;" data-v-06225672>2020-01-05</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="data:image/png;base64,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">取消功能的设计与实现<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="取消功能的设计与实现"><a href="#取消功能的设计与实现" class="header-anchor">#</a> 取消功能的设计与实现</h1> <h2 id="需求分析"><a href="#需求分析" class="header-anchor">#</a> 需求分析</h2> <p>有些场景下，我们希望能主动取消请求，比如常见的搜索框案例，在用户输入过程中，搜索框的内容也在不断变化，正常情况每次变化我们都应该向服务端发送一次请求。但是当用户输入过快的时候，我们不希望每次变化请求都发出去，通常一个解决方案是前端用 debounce 的方案，比如延时 200ms 发送请求。这样当用户连续输入的字符，只要输入间隔小于 200ms，前面输入的字符都不会发请求。</p> <p>但是还有一种极端情况是后端接口很慢，比如超过 1s 才能响应，这个时候即使做了 200ms 的 debounce，但是在我慢慢输入（每个输入间隔超过 200ms）的情况下，在前面的请求没有响应前，也有可能发出去多个请求。因为接口的响应时长是不定的，如果先发出去的请求响应时长比后发出去的请求要久一些，后请求的响应先回来，先请求的响应后回来，就会出现前面请求响应结果覆盖后面请求响应结果的情况，那么就乱了。因此在这个场景下，我们除了做 debounce，还希望后面的请求发出去的时候，如果前面的请求还没有响应，我们可以把前面的请求取消。</p> <p>从 axios 的取消接口设计层面，我们希望做如下的设计：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">const</span> CancelToken <span class="token operator">=</span> axios<span class="token punctuation">.</span>CancelToken<span class="token punctuation">;</span>
    26. 

  26. <span class="token keyword">const</span> source <span class="token operator">=</span> CancelToken<span class="token punctuation">.</span><span class="token function">source</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    27. 

  27. 

  28. axios<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/user/12345'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    29. 

  29.   cancelToken<span class="token operator">:</span> source<span class="token punctuation">.</span>token
    30. 

  30. <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    31. 

  31.   <span class="token keyword">if</span> <span class="token punctuation">(</span>axios<span class="token punctuation">.</span><span class="token function">isCancel</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    32. 

  32.     <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'Request canceled'</span><span class="token punctuation">,</span> e<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">;</span>
    33. 

  33.   <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    34. 

  34.     <span class="token comment">// 处理错误</span>
    35. 

  35.   <span class="token punctuation">}</span>
    36. 

  36. <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    37. 

  37. 

  38. <span class="token comment">// 取消请求 (请求原因是可选的)</span>
    39. 

  39. source<span class="token punctuation">.</span><span class="token function">cancel</span><span class="token punctuation">(</span><span class="token string">'Operation canceled by the user.'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    40. 

  40. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br></div></div><p>我们给 <code>axios</code> 添加一个 <code>CancelToken</code> 的对象，它有一个 <code>source</code> 方法可以返回一个 <code>source</code> 对象，<code>source.token</code> 是在每次请求的时候传给配置对象中的 <code>cancelToken</code> 属性，然后在请求发出去之后，我们可以通过 <code>source.cancel</code> 方法取消请求。</p> <p>我们还支持另一种方式的调用：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">const</span> CancelToken <span class="token operator">=</span> axios<span class="token punctuation">.</span>CancelToken<span class="token punctuation">;</span>
    41. 

  41. <span class="token keyword">let</span> cancel<span class="token punctuation">;</span>
    42. 

  42. 

  43. axios<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/user/12345'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    44. 

  44.   cancelToken<span class="token operator">:</span> <span class="token keyword">new</span> <span class="token class-name">CancelToken</span><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token function">executor</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    45. 

  45.     cancel <span class="token operator">=</span> c<span class="token punctuation">;</span>
    46. 

  46.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    47. 

  47. <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    48. 

  48. 

  49. <span class="token comment">// 取消请求</span>
    50. 

  50. <span class="token function">cancel</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    51. 

  51. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p><code>axios.CancelToken</code> 是一个类，我们直接把它实例化的对象传给请求配置中的 <code>cancelToken</code> 属性，<code>CancelToken</code> 的构造函数参数支持传入一个 <code>executor</code> 方法，该方法的参数是一个取消函数 <code>c</code>，我们可以在 <code>executor</code> 方法执行的内部拿到这个取消函数 <code>c</code>，赋值给我们外部定义的 <code>cancel</code> 变量，之后我们可以通过调用这个 <code>cancel</code> 方法来取消请求。</p> <h2 id="异步分离的设计方案"><a href="#异步分离的设计方案" class="header-anchor">#</a> 异步分离的设计方案</h2> <p>通过需求分析，我们知道想要实现取消某次请求，我们需要为该请求配置一个 <code>cancelToken</code>，然后在外部调用一个 <code>cancel</code> 方法。</p> <p>请求的发送是一个异步过程，最终会执行 <code>xhr.send</code> 方法，<code>xhr</code> 对象提供了 <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/abort" target="_blank" rel="noopener noreferrer"><code>abort</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 方法，可以把请求取消。因为我们在外部是碰不到 <code>xhr</code> 对象的，所以我们想在执行 <code>cancel</code> 的时候，去执行 <code>xhr.abort</code> 方法。</p> <p>现在就相当于我们在 <code>xhr</code> 异步请求过程中，插入一段代码，当我们在外部执行 <code>cancel</code> 函数的时候，会驱动这段代码的执行，然后执行 <code>xhr.abort</code> 方法取消请求。</p> <p>我们可以利用 Promise 实现异步分离，也就是在 <code>cancelToken</code> 中保存一个 <code>pending</code> 状态的 Promise 对象，然后当我们执行 <code>cancel</code> 方法的时候，能够访问到这个 Promise 对象，把它从 <code>pending</code> 状态变成 <code>resolved</code> 状态，这样我们就可以在 <code>then</code> 函数中去实现取消请求的逻辑，类似如下的代码：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>
    52. 

  52. <span class="token keyword">if</span> <span class="token punctuation">(</span>cancelToken<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    53. 

  53.   cancelToken<span class="token punctuation">.</span>promise
    54. 

  54.     <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>reason <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    55. 

  55.       request<span class="token punctuation">.</span><span class="token function">abort</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    56. 

  56.       <span class="token function">reject</span><span class="token punctuation">(</span>reason<span class="token punctuation">)</span>
    57. 

  57.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    58. 

  58. <span class="token punctuation">}</span>
    59. 

  59. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><h2 id="canceltoken-类实现"><a href="#canceltoken-类实现" class="header-anchor">#</a> CancelToken 类实现</h2> <p>接下来，我们就来实现这个 <code>CancelToken</code> 类，先来看一下接口定义：</p> <h3 id="接口定义"><a href="#接口定义" class="header-anchor">#</a> 接口定义</h3> <p><code>types/index.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">AxiosRequestConfig</span> <span class="token punctuation">{</span>
    60. 

  60.   <span class="token comment">// ...</span>
    61. 

  61.   cancelToken<span class="token operator">?</span><span class="token operator">:</span> CancelToken
    62. 

  62. <span class="token punctuation">}</span>
    63. 

  63. 

  64. <span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">CancelToken</span> <span class="token punctuation">{</span>
    65. 

  65.   promise<span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token builtin">string</span><span class="token operator">&gt;</span>
    66. 

  66.   reason<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">string</span>
    67. 

  67. <span class="token punctuation">}</span>
    68. 

  68. 

  69. <span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">Canceler</span> <span class="token punctuation">{</span>
    70. 

  70.   <span class="token punctuation">(</span>message<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span>
    71. 

  71. <span class="token punctuation">}</span>
    72. 

  72. 

  73. <span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">CancelExecutor</span> <span class="token punctuation">{</span>
    74. 

  74.   <span class="token punctuation">(</span>cancel<span class="token operator">:</span> Canceler<span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span>
    75. 

  75. <span class="token punctuation">}</span>
    76. 

  76. 

  77. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br></div></div><p>其中 <code>CancelToken</code> 是实例类型的接口定义，<code>Canceler</code> 是取消方法的接口定义，<code>CancelExecutor</code> 是 <code>CancelToken</code> 类构造函数参数的接口定义。</p> <h3 id="代码实现"><a href="#代码实现" class="header-anchor">#</a> 代码实现</h3> <p>我们单独创建 <code>cancel</code> 目录来管理取消相关的代码，在 <code>cancel</code> 目录下创建 <code>CancelToken.ts</code> 文件：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> CancelExecutor <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../types'</span>
    78. 

  78. 

  79. <span class="token keyword">interface</span> <span class="token class-name">ResolvePromise</span> <span class="token punctuation">{</span>
    80. 

  80.   <span class="token punctuation">(</span>reason<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span>
    81. 

  81. <span class="token punctuation">}</span>
    82. 

  82. 

  83. <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">class</span> <span class="token class-name">CancelToken</span> <span class="token punctuation">{</span>
    84. 

  84.   promise<span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token builtin">string</span><span class="token operator">&gt;</span>
    85. 

  85.   reason<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">string</span>
    86. 

  86. 

  87.   <span class="token function">constructor</span><span class="token punctuation">(</span>executor<span class="token operator">:</span> CancelExecutor<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    88. 

  88.     <span class="token keyword">let</span> resolvePromise<span class="token operator">:</span> ResolvePromise
    89. 

  89.     <span class="token keyword">this</span><span class="token punctuation">.</span>promise <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name"><span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token builtin">string</span><span class="token operator">&gt;</span></span><span class="token punctuation">(</span>resolve <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    90. 

  90.       resolvePromise <span class="token operator">=</span> resolve
    91. 

  91.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    92. 

  92. 

  93.     <span class="token function">executor</span><span class="token punctuation">(</span>message <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    94. 

  94.       <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>reason<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    95. 

  95.         <span class="token keyword">return</span>
    96. 

  96.       <span class="token punctuation">}</span>
    97. 

  97.       <span class="token keyword">this</span><span class="token punctuation">.</span>reason <span class="token operator">=</span> message
    98. 

  98.       <span class="token function">resolvePromise</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>reason<span class="token punctuation">)</span>
    99. 

  99.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    100. 

  100.   <span class="token punctuation">}</span>
    101. 

  101. <span class="token punctuation">}</span>
    102. 

  102. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br></div></div><p>在 <code>CancelToken</code> 构造函数内部，实例化一个 <code>pending</code> 状态的 Promise 对象，然后用一个 <code>resolvePromise</code> 变量指向 <code>resolve</code> 函数。接着执行 <code>executor</code> 函数，传入一个 <code>cancel</code> 函数，在 <code>cancel</code> 函数内部，会调用 <code>resolvePromise</code> 把 Promise 对象从 <code>pending</code> 状态变为 <code>resolved</code> 状态。</p> <p>接着我们在 <code>xhr.ts</code> 中插入一段取消请求的逻辑。</p> <p><code>core/xhr.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">const</span> <span class="token punctuation">{</span> <span class="token comment">/*....*/</span> cancelToken <span class="token punctuation">}</span> <span class="token operator">=</span> config
    103. 

  103. 

  104. <span class="token keyword">if</span> <span class="token punctuation">(</span>cancelToken<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    105. 

  105.   cancelToken<span class="token punctuation">.</span>promise<span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>reason <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    106. 

  106.     request<span class="token punctuation">.</span><span class="token function">abort</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    107. 

  107.     <span class="token function">reject</span><span class="token punctuation">(</span>reason<span class="token punctuation">)</span>
    108. 

  108.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    109. 

  109. <span class="token punctuation">}</span>
    110. 

  110. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><p>这样就满足了第二种使用方式，接着我们要实现第一种使用方式，给 <code>CancelToken</code> 扩展静态接口。</p> <h2 id="canceltoken-扩展静态接口"><a href="#canceltoken-扩展静态接口" class="header-anchor">#</a> CancelToken 扩展静态接口</h2> <h3 id="接口定义-2"><a href="#接口定义-2" class="header-anchor">#</a> 接口定义</h3> <p><code>types/index.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">CancelTokenSource</span> <span class="token punctuation">{</span>
    111. 

  111.   token<span class="token operator">:</span> CancelToken
    112. 

  112.   cancel<span class="token operator">:</span> Canceler
    113. 

  113. <span class="token punctuation">}</span>
    114. 

  114. 

  115. <span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">CancelTokenStatic</span> <span class="token punctuation">{</span>
    116. 

  116.   <span class="token keyword">new</span><span class="token punctuation">(</span>executor<span class="token operator">:</span> CancelExecutor<span class="token punctuation">)</span><span class="token operator">:</span> CancelToken
    117. 

  117. 

  118.   <span class="token function">source</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">:</span> CancelTokenSource
    119. 

  119. <span class="token punctuation">}</span>
    120. 

  120. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>其中 <code>CancelTokenSource</code> 作为 <code>CancelToken</code> 类静态方法 <code>source</code> 函数的返回值类型，<code>CancelTokenStatic</code> 则作为 <code>CancelToken</code> 类的类类型。</p> <h3 id="代码实现-2"><a href="#代码实现-2" class="header-anchor">#</a> 代码实现</h3> <p><code>cancel/CancelToken.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">class</span> <span class="token class-name">CancelToken</span> <span class="token punctuation">{</span>
    121. 

  121.   <span class="token comment">// ...</span>
    122. 

  122. 

  123.   <span class="token keyword">static</span> <span class="token function">source</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">:</span> CancelTokenSource <span class="token punctuation">{</span>
    124. 

  124.     <span class="token keyword">let</span> cancel<span class="token operator">!</span><span class="token operator">:</span> Canceler
    125. 

  125.     <span class="token keyword">const</span> token <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CancelToken</span><span class="token punctuation">(</span>c <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    126. 

  126.       cancel <span class="token operator">=</span> c
    127. 

  127.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    128. 

  128.     <span class="token keyword">return</span> <span class="token punctuation">{</span>
    129. 

  129.       cancel<span class="token punctuation">,</span>
    130. 

  130.       token
    131. 

  131.     <span class="token punctuation">}</span>
    132. 

  132.   <span class="token punctuation">}</span>
    133. 

  133. <span class="token punctuation">}</span>
    134. 

  134. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br></div></div><p><code>source</code> 的静态方法很简单，定义一个 <code>cancel</code> 变量实例化一个 <code>CancelToken</code> 类型的对象，然后在 <code>executor</code> 函数中，把 <code>cancel</code> 指向参数 <code>c</code> 这个取消函数。</p> <p>这样就满足了我们第一种使用方式，但是在第一种使用方式的例子中，我们在捕获请求的时候，通过 <code>axios.isCancel</code> 来判断这个错误参数 e 是不是一次取消请求导致的错误，接下来我们对取消错误的原因做一层包装，并且把给 <code>axios</code> 扩展静态方法</p> <h2 id="cancel-类实现及-axios-的扩展"><a href="#cancel-类实现及-axios-的扩展" class="header-anchor">#</a> Cancel 类实现及 axios 的扩展</h2> <h3 id="接口定义-3"><a href="#接口定义-3" class="header-anchor">#</a> 接口定义</h3> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">Cancel</span> <span class="token punctuation">{</span>
    135. 

  135.   message<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">string</span>
    136. 

  136. <span class="token punctuation">}</span>
    137. 

  137. 

  138. <span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">CancelStatic</span> <span class="token punctuation">{</span>
    139. 

  139.   <span class="token keyword">new</span><span class="token punctuation">(</span>message<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">)</span><span class="token operator">:</span> Cancel
    140. 

  140. <span class="token punctuation">}</span>
    141. 

  141. 

  142. <span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">AxiosStatic</span> <span class="token keyword">extends</span> <span class="token class-name">AxiosInstance</span> <span class="token punctuation">{</span>
    143. 

  143.   <span class="token function">create</span><span class="token punctuation">(</span>config<span class="token operator">?</span><span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosInstance
    144. 

  144. 

  145.   CancelToken<span class="token operator">:</span> CancelTokenStatic
    146. 

  146.   Cancel<span class="token operator">:</span> CancelStatic
    147. 

  147.   <span class="token function-variable function">isCancel</span><span class="token operator">:</span> <span class="token punctuation">(</span>value<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token builtin">boolean</span>
    148. 

  148. <span class="token punctuation">}</span>
    149. 

  149. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br></div></div><p>其中 <code>Cancel</code> 是实例类型的接口定义，<code>CancelStatic</code> 是类类型的接口定义，并且我们给 <code>axios</code> 扩展了多个静态方法。</p> <h3 id="代码实现-3"><a href="#代码实现-3" class="header-anchor">#</a> 代码实现</h3> <p>我在 <code>cancel</code> 目录下创建 <code>Cancel.ts</code> 文件。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">class</span> <span class="token class-name">Cancel</span> <span class="token punctuation">{</span>
    150. 

  150.   message<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">string</span>
    151. 

  151. 

  152.   <span class="token function">constructor</span><span class="token punctuation">(</span>message<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    153. 

  153.     <span class="token keyword">this</span><span class="token punctuation">.</span>message <span class="token operator">=</span> message
    154. 

  154.   <span class="token punctuation">}</span>
    155. 

  155. <span class="token punctuation">}</span>
    156. 

  156. 

  157. <span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">isCancel</span><span class="token punctuation">(</span>value<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">boolean</span> <span class="token punctuation">{</span>
    158. 

  158.   <span class="token keyword">return</span> value <span class="token keyword">instanceof</span> <span class="token class-name">Cancel</span>
    159. 

  159. <span class="token punctuation">}</span>
    160. 

  160. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p><code>Cancel</code> 类非常简单，拥有一个 <code>message</code> 的公共属性。<code>isCancel</code> 方法也非常简单，通过 <code>instanceof</code> 来判断传入的值是不是一个 <code>Cancel</code> 对象。</p> <p>接着我们对 <code>CancelToken</code> 类中的 <code>reason</code> 类型做修改，把它变成一个 <code>Cancel</code> 类型的实例。</p> <p>先修改定义部分。</p> <p><code>types/index.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">CancelToken</span> <span class="token punctuation">{</span>
    161. 

  161.   promise<span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span>Cancel<span class="token operator">&gt;</span>
    162. 

  162.   reason<span class="token operator">?</span><span class="token operator">:</span> Cancel
    163. 

  163. <span class="token punctuation">}</span>
    164. 

  164. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>再修改实现部分：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> Cancel <span class="token keyword">from</span> <span class="token string">'./Cancel'</span>
    165. 

  165. 

  166. <span class="token keyword">interface</span> <span class="token class-name">ResolvePromise</span> <span class="token punctuation">{</span>
    167. 

  167.   <span class="token punctuation">(</span>reason<span class="token operator">?</span><span class="token operator">:</span> Cancel<span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span>
    168. 

  168. <span class="token punctuation">}</span>
    169. 

  169. 

  170. <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">class</span> <span class="token class-name">CancelToken</span> <span class="token punctuation">{</span>
    171. 

  171.   promise<span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span>Cancel<span class="token operator">&gt;</span>
    172. 

  172.   reason<span class="token operator">?</span><span class="token operator">:</span> Cancel
    173. 

  173. 

  174.   <span class="token function">constructor</span><span class="token punctuation">(</span>executor<span class="token operator">:</span> CancelExecutor<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    175. 

  175.     <span class="token keyword">let</span> resolvePromise<span class="token operator">:</span> ResolvePromise
    176. 

  176.     <span class="token keyword">this</span><span class="token punctuation">.</span>promise <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name"><span class="token builtin">Promise</span><span class="token operator">&lt;</span>Cancel<span class="token operator">&gt;</span></span><span class="token punctuation">(</span>resolve <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    177. 

  177.       resolvePromise <span class="token operator">=</span> resolve
    178. 

  178.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    179. 

  179. 

  180.     <span class="token function">executor</span><span class="token punctuation">(</span>message <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    181. 

  181.       <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>reason<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    182. 

  182.         <span class="token keyword">return</span>
    183. 

  183.       <span class="token punctuation">}</span>
    184. 

  184.       <span class="token keyword">this</span><span class="token punctuation">.</span>reason <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Cancel</span><span class="token punctuation">(</span>message<span class="token punctuation">)</span>
    185. 

  185.       <span class="token function">resolvePromise</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>reason<span class="token punctuation">)</span>
    186. 

  186.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    187. 

  187.   <span class="token punctuation">}</span>
    188. 

  188. <span class="token punctuation">}</span>
    189. 

  189. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br></div></div><p>接下来我们给 <code>axios</code> 扩展一些静态方法，供用户使用。</p> <p><code>axios.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> CancelToken <span class="token keyword">from</span> <span class="token string">'./cancel/CancelToken'</span>
    190. 

  190. <span class="token keyword">import</span> Cancel<span class="token punctuation">,</span> <span class="token punctuation">{</span> isCancel <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./cancel/Cancel'</span>
    191. 

  191. 

  192. axios<span class="token punctuation">.</span>CancelToken <span class="token operator">=</span> CancelToken
    193. 

  193. axios<span class="token punctuation">.</span>Cancel <span class="token operator">=</span> Cancel
    194. 

  194. axios<span class="token punctuation">.</span>isCancel <span class="token operator">=</span> isCancel
    195. 

  195. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><h2 id="额外逻辑实现"><a href="#额外逻辑实现" class="header-anchor">#</a> 额外逻辑实现</h2> <p>除此之外，我们还需要实现一些额外逻辑，比如当一个请求携带的 <code>cancelToken</code> 已经被使用过，那么我们甚至都可以不发送这个请求，只需要抛一个异常即可，并且抛异常的信息就是我们取消的原因，所以我们需要给 <code>CancelToken</code> 扩展一个方法。</p> <p>先修改定义部分。</p> <p><code>types/index.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">CancelToken</span> <span class="token punctuation">{</span>
    196. 

  196.   promise<span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span>Cancel<span class="token operator">&gt;</span>
    197. 

  197.   reason<span class="token operator">?</span><span class="token operator">:</span> Cancel
    198. 

  198. 

  199.   <span class="token function">throwIfRequested</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span>
    200. 

  200. <span class="token punctuation">}</span>
    201. 

  201. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>添加一个 <code>throwIfRequested</code> 方法，接下来实现它：</p> <p><code>cancel/CancelToken.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">class</span> <span class="token class-name">CancelToken</span> <span class="token punctuation">{</span>
    202. 

  202.   <span class="token comment">// ...</span>
    203. 

  203. 

  204.   <span class="token function">throwIfRequested</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
    205. 

  205.     <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>reason<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    206. 

  206.       <span class="token keyword">throw</span> <span class="token keyword">this</span><span class="token punctuation">.</span>reason
    207. 

  207.     <span class="token punctuation">}</span>
    208. 

  208.   <span class="token punctuation">}</span>
    209. 

  209. <span class="token punctuation">}</span>
    210. 

  210. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>判断如果存在 <code>this.reason</code>，说明这个 <code>token</code> 已经被使用过了，直接抛错。</p> <p>接下来在发送请求前增加一段逻辑。</p> <p><code>core/dispatchRequest.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">function</span> <span class="token function">dispatchRequest</span><span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise <span class="token punctuation">{</span>
    211. 

  211.   <span class="token function">throwIfCancellationRequested</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    212. 

  212.   <span class="token function">processConfig</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    213. 

  213. 

  214.   <span class="token comment">// ...</span>
    215. 

  215. <span class="token punctuation">}</span>
    216. 

  216. 

  217. <span class="token keyword">function</span> <span class="token function">throwIfCancellationRequested</span><span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
    218. 

  218.   <span class="token keyword">if</span> <span class="token punctuation">(</span>config<span class="token punctuation">.</span>cancelToken<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    219. 

  219.     config<span class="token punctuation">.</span>cancelToken<span class="token punctuation">.</span><span class="token function">throwIfRequested</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    220. 

  220.   <span class="token punctuation">}</span>
    221. 

  221. <span class="token punctuation">}</span>
    222. 

  222. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><p>发送请求前检查一下配置的 cancelToken 是否已经使用过了，如果已经被用过则不用法请求，直接抛异常。</p> <h2 id="demo-编写"><a href="#demo-编写" class="header-anchor">#</a> demo 编写</h2> <p>在 <code>examples</code> 目录下创建 <code>cancel</code> 目录，在 <code>cancel</code> 目录下创建 <code>index.html</code>:</p> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
    223. 

  223. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    224. 

  224.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    225. 

  225.     <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>utf-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    226. 

  226.     <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Cancel example<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    227. 

  227.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
    228. 

  228.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    229. 

  229.     <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>/__build__/cancel.js<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script"></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
    230. 

  230.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
    231. 

  231. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
    232. 

  232. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>接着创建 <code>app.ts</code> 作为入口文件：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> axios<span class="token punctuation">,</span> <span class="token punctuation">{</span> Canceler <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/index'</span>
    233. 

  233. 

  234. <span class="token keyword">const</span> CancelToken <span class="token operator">=</span> axios<span class="token punctuation">.</span>CancelToken
    235. 

  235. <span class="token keyword">const</span> source <span class="token operator">=</span> CancelToken<span class="token punctuation">.</span><span class="token function">source</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    236. 

  236. 

  237. axios<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/cancel/get'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    238. 

  238.   cancelToken<span class="token operator">:</span> source<span class="token punctuation">.</span>token
    239. 

  239. <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    240. 

  240.   <span class="token keyword">if</span> <span class="token punctuation">(</span>axios<span class="token punctuation">.</span><span class="token function">isCancel</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    241. 

  241.     <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'Request canceled'</span><span class="token punctuation">,</span> e<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
    242. 

  242.   <span class="token punctuation">}</span>
    243. 

  243. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    244. 

  244. 

  245. <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    246. 

  246.   source<span class="token punctuation">.</span><span class="token function">cancel</span><span class="token punctuation">(</span><span class="token string">'Operation canceled by the user.'</span><span class="token punctuation">)</span>
    247. 

  247. 

  248.   axios<span class="token punctuation">.</span><span class="token function">post</span><span class="token punctuation">(</span><span class="token string">'/cancel/post'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> a<span class="token operator">:</span> <span class="token number">1</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> cancelToken<span class="token operator">:</span> source<span class="token punctuation">.</span>token <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    249. 

  249.     <span class="token keyword">if</span> <span class="token punctuation">(</span>axios<span class="token punctuation">.</span><span class="token function">isCancel</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    250. 

  250.       <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span>message<span class="token punctuation">)</span>
    251. 

  251.     <span class="token punctuation">}</span>
    252. 

  252.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    253. 

  253. <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">)</span>
    254. 

  254. 

  255. <span class="token keyword">let</span> cancel<span class="token operator">:</span> Canceler
    256. 

  256. 

  257. axios<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/cancel/get'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    258. 

  258.   cancelToken<span class="token operator">:</span> <span class="token keyword">new</span> <span class="token class-name">CancelToken</span><span class="token punctuation">(</span>c <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    259. 

  259.     cancel <span class="token operator">=</span> c
    260. 

  260.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    261. 

  261. <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    262. 

  262.   <span class="token keyword">if</span> <span class="token punctuation">(</span>axios<span class="token punctuation">.</span><span class="token function">isCancel</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    263. 

  263.     <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'Request canceled'</span><span class="token punctuation">)</span>
    264. 

  264.   <span class="token punctuation">}</span>
    265. 

  265. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    266. 

  266. 

  267. <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    268. 

  268.   <span class="token function">cancel</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    269. 

  269. <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">200</span><span class="token punctuation">)</span>
    270. 

  270. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br></div></div><p>我们的 demo 展示了 2 种使用方式，也演示了如果一个 token 已经被使用过，则再次携带该 token 的请求并不会发送。</p> <p>至此，我们完成了 <code>ts-axios</code> 的请求取消功能，我们巧妙地利用了 Promise 实现了异步分离。目前官方 <code>axios</code> 库的一些大的 feature 我们都已经实现了，下面的章节我们就开始补充完善 <code>ts-axios</code> 的其它功能。</p></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/heBody/blog/edit/master/docs/《TypeScript 从零实现 axios》/09.ts-axios 取消功能实现/01.取消功能的设计与实现.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="tags"><a href="/blog/tags/?tag=TypeScript" title="标签">#TypeScript</a></div> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2022/12/14, 19:36:42</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/blog/pages/7b49658c26f613bf/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">扩展 create 静态接口</div></a> <a href="/blog/pages/5dce43eba796a2ab/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">withCredentials</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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