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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 class="sidebar-heading"><span>ts-axios 项目初始化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 基础功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 异常情况处理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 接口扩展</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 拦截器实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 配置化实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 取消功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>ts-axios 更多功能实现</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/blog/pages/5dce43eba796a2ab/" class="sidebar-link">withCredentials</a></li><li><a href="/blog/pages/390cb70e2b619449/" class="sidebar-link">XSRF 防御</a></li><li><a href="/blog/pages/1376fd897809036e/" aria-current="page" class="active sidebar-link">上传和下载的进度监控</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/1376fd897809036e/#需求分析" class="sidebar-link">需求分析</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/1376fd897809036e/#代码实现" class="sidebar-link">代码实现</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/1376fd897809036e/#demo-编写" class="sidebar-link">demo 编写</a></li></ul></li><li><a href="/blog/pages/89cd6496c23159ae/" class="sidebar-link">HTTP 授权</a></li><li><a href="/blog/pages/40b41ce8e8159567/" class="sidebar-link">自定义合法状态码</a></li><li><a href="/blog/pages/7753b8141663e54a/" class="sidebar-link">自定义参数序列化</a></li><li><a href="/blog/pages/0b9f2ee2b4dbb728/" class="sidebar-link">baseURL</a></li><li><a href="/blog/pages/c26b053540a7dafa/" class="sidebar-link">静态方法扩展</a></li></ul></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-06970110><div class="articleInfo" data-v-06970110><ul class="breadcrumbs" data-v-06970110><li data-v-06970110><a href="/blog/" title="首页" class="iconfont icon-home router-link-active" data-v-06970110></a></li> <li data-v-06970110><a href="/blog/note/typescript-axios/#《TypeScript 从零实现 axios》" data-v-06970110>《TypeScript 从零实现 axios》</a></li><li data-v-06970110><a href="/blog/note/typescript-axios/#ts-axios 更多功能实现" data-v-06970110>ts-axios 更多功能实现</a></li></ul> <div class="info" data-v-06970110><div title="作者" class="author iconfont icon-touxiang" data-v-06970110><a href="javascript:;" data-v-06970110>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06970110><a href="javascript:;" data-v-06970110>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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">上传和下载的进度监控<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="上传和下载的进度监控"><a href="#上传和下载的进度监控" class="header-anchor">#</a> 上传和下载的进度监控</h1> <h2 id="需求分析"><a href="#需求分析" class="header-anchor">#</a> 需求分析</h2> <p>有些时候，当我们上传文件或者是请求一个大体积数据的时候，希望知道实时的进度，甚至可以基于此做一个进度条的展示。</p> <p>我们希望给 <code>axios</code> 的请求配置提供 <code>onDownloadProgress</code> 和 <code>onUploadProgress</code> 2 个函数属性，用户可以通过这俩函数实现对下载进度和上传进度的监控。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>axios<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/more/get'</span><span class="token punctuation">,</span><span class="token punctuation">{</span>
    26. 

  26.   <span class="token function">onDownloadProgress</span><span class="token punctuation">(</span>progressEvent<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    27. 

  27.     <span class="token comment">// 监听下载进度</span>
    28. 

  28.   <span class="token punctuation">}</span>
    29. 

  29. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    30. 

  30. 

  31. axios<span class="token punctuation">.</span><span class="token function">post</span><span class="token punctuation">(</span><span class="token string">'/more/post'</span><span class="token punctuation">,</span><span class="token punctuation">{</span>
    32. 

  32.   <span class="token function">onUploadProgress</span><span class="token punctuation">(</span>progressEvent<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    33. 

  33.     <span class="token comment">// 监听上传进度</span>
    34. 

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

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

  36. </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>xhr</code> 对象提供了一个 <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/progress_event" target="_blank" rel="noopener noreferrer"><code>progress</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> 事件，我们可以监听此事件对数据的下载进度做监控；另外，<a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/upload" target="_blank" rel="noopener noreferrer"><code>xhr.uplaod</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> 对象也提供了 <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/progress_event" target="_blank" rel="noopener noreferrer"><code>progress</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> 事件，我们可以基于此对上传进度做监控。</p> <h2 id="代码实现"><a href="#代码实现" class="header-anchor">#</a> 代码实现</h2> <p>首先修改一下类型定义。</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">AxiosRequestConfig</span> <span class="token punctuation">{</span>
    37. 

  37.   <span class="token comment">// ...</span>
    38. 

  38.   onDownloadProgress<span class="token operator">?</span><span class="token operator">:</span> <span class="token punctuation">(</span>e<span class="token operator">:</span> ProgressEvent<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token keyword">void</span>
    39. 

  39.   onUploadProgress<span class="token operator">?</span><span class="token operator">:</span> <span class="token punctuation">(</span>e<span class="token operator">:</span> ProgressEvent<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token keyword">void</span>
    40. 

  40. <span class="token punctuation">}</span>
    41. 

  41. </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></div></div><p>接着在发送请求前，给 <code>xhr</code> 对象添加属性。</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>
    42. 

  42.   <span class="token comment">/*...*/</span>
    43. 

  43.   onDownloadProgress<span class="token punctuation">,</span>
    44. 

  44.   onUploadProgress
    45. 

  45. <span class="token punctuation">}</span> <span class="token operator">=</span> config
    46. 

  46. 

  47. <span class="token keyword">if</span> <span class="token punctuation">(</span>onDownloadProgress<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    48. 

  48.   request<span class="token punctuation">.</span>onprogress <span class="token operator">=</span> onDownloadProgress
    49. 

  49. <span class="token punctuation">}</span>
    50. 

  50. 

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

  52.   request<span class="token punctuation">.</span>upload<span class="token punctuation">.</span>onprogress <span class="token operator">=</span> onUploadProgress
    53. 

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

  54. </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></div></div><p>另外，如果请求的数据是 <code>FormData</code> 类型，我们应该主动删除请求 <code>headers</code> 中的 <code>Content-Type</code> 字段，让浏览器自动根据请求数据设置 <code>Content-Type</code>。比如当我们通过 <code>FormData</code> 上传文件的时候，浏览器会把请求 <code>headers</code> 中的 <code>Content-Type</code> 设置为 <code>multipart/form-data</code>。</p> <p>我们先添加一个判断 <code>FormData</code> 的方法。</p> <p><code>helpers/util.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">function</span> <span class="token function">isFormData</span><span class="token punctuation">(</span>val<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>
    55. 

  55.   <span class="token keyword">return</span> <span class="token keyword">typeof</span> val <span class="token operator">!==</span> <span class="token string">'undefined'</span> <span class="token operator">&amp;&amp;</span> val <span class="token keyword">instanceof</span> <span class="token class-name">FormData</span>
    56. 

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

  57. </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></div></div><p>然后再添加相关逻辑。</p> <p><code>core/xhr.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isFormData</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    58. 

  58.   <span class="token keyword">delete</span> headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span>
    59. 

  59. <span class="token punctuation">}</span>
    60. 

  60. </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></div></div><p>我们发现，<code>xhr</code> 函数内部随着需求越来越多，代码也越来越臃肿，我们可以把逻辑梳理一下，把内部代码做一层封装优化。</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">xhr</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>
    61. 

  61.   <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name"><span class="token builtin">Promise</span></span><span class="token punctuation">(</span><span class="token punctuation">(</span>resolve<span class="token punctuation">,</span> reject<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    62. 

  62.     <span class="token keyword">const</span> <span class="token punctuation">{</span>
    63. 

  63.       data <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">,</span>
    64. 

  64.       url<span class="token punctuation">,</span>
    65. 

  65.       method <span class="token operator">=</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
    66. 

  66.       headers<span class="token punctuation">,</span>
    67. 

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

  68.       timeout<span class="token punctuation">,</span>
    69. 

  69.       cancelToken<span class="token punctuation">,</span>
    70. 

  70.       withCredentials<span class="token punctuation">,</span>
    71. 

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

  72.       xsrfHeaderName<span class="token punctuation">,</span>
    73. 

  73.       onDownloadProgress<span class="token punctuation">,</span>
    74. 

  74.       onUploadProgress
    75. 

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

  76. 

  77.     <span class="token keyword">const</span> request <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLHttpRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    78. 

  78. 

  79.     request<span class="token punctuation">.</span><span class="token function">open</span><span class="token punctuation">(</span>method<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> url<span class="token operator">!</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
    80. 

  80. 

  81.     <span class="token function">configureRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    82. 

  82. 

  83.     <span class="token function">addEvents</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    84. 

  84. 

  85.     <span class="token function">processHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    86. 

  86. 

  87.     <span class="token function">processCancel</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    88. 

  88. 

  89.     request<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span>
    90. 

  90. 

  91.     <span class="token keyword">function</span> <span class="token function">configureRequest</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>
    92. 

  92.       <span class="token keyword">if</span> <span class="token punctuation">(</span>responseType<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    93. 

  93.         request<span class="token punctuation">.</span>responseType <span class="token operator">=</span> responseType
    94. 

  94.       <span class="token punctuation">}</span>
    95. 

  95. 

  96.       <span class="token keyword">if</span> <span class="token punctuation">(</span>timeout<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    97. 

  97.         request<span class="token punctuation">.</span>timeout <span class="token operator">=</span> timeout
    98. 

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

  99. 

  100.       <span class="token keyword">if</span> <span class="token punctuation">(</span>withCredentials<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    101. 

  101.         request<span class="token punctuation">.</span>withCredentials <span class="token operator">=</span> withCredentials
    102. 

  102.       <span class="token punctuation">}</span>
    103. 

  103.     <span class="token punctuation">}</span>
    104. 

  104. 

  105.     <span class="token keyword">function</span> <span class="token function">addEvents</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>
    106. 

  106.       request<span class="token punctuation">.</span><span class="token function-variable function">onreadystatechange</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token function">handleLoad</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    107. 

  107.         <span class="token keyword">if</span> <span class="token punctuation">(</span>request<span class="token punctuation">.</span>readyState <span class="token operator">!==</span> <span class="token number">4</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    108. 

  108.           <span class="token keyword">return</span>
    109. 

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

  110. 

  111.         <span class="token keyword">if</span> <span class="token punctuation">(</span>request<span class="token punctuation">.</span>status <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    112. 

  112.           <span class="token keyword">return</span>
    113. 

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

  114. 

  115.         <span class="token keyword">const</span> responseHeaders <span class="token operator">=</span> <span class="token function">parseHeaders</span><span class="token punctuation">(</span>request<span class="token punctuation">.</span><span class="token function">getAllResponseHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
    116. 

  116.         <span class="token keyword">const</span> responseData <span class="token operator">=</span>
    117. 

  117.           responseType <span class="token operator">&amp;&amp;</span> responseType <span class="token operator">!==</span> <span class="token string">'text'</span> <span class="token operator">?</span> request<span class="token punctuation">.</span>response <span class="token operator">:</span> request<span class="token punctuation">.</span>responseText
    118. 

  118.         <span class="token keyword">const</span> response<span class="token operator">:</span> AxiosResponse <span class="token operator">=</span> <span class="token punctuation">{</span>
    119. 

  119.           data<span class="token operator">:</span> responseData<span class="token punctuation">,</span>
    120. 

  120.           status<span class="token operator">:</span> request<span class="token punctuation">.</span>status<span class="token punctuation">,</span>
    121. 

  121.           statusText<span class="token operator">:</span> request<span class="token punctuation">.</span>statusText<span class="token punctuation">,</span>
    122. 

  122.           headers<span class="token operator">:</span> responseHeaders<span class="token punctuation">,</span>
    123. 

  123.           config<span class="token punctuation">,</span>
    124. 

  124.           request
    125. 

  125.         <span class="token punctuation">}</span>
    126. 

  126.         <span class="token function">handleResponse</span><span class="token punctuation">(</span>response<span class="token punctuation">)</span>
    127. 

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

  128. 

  129.       request<span class="token punctuation">.</span><span class="token function-variable function">onerror</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token function">handleError</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    130. 

  130.         <span class="token function">reject</span><span class="token punctuation">(</span><span class="token function">createError</span><span class="token punctuation">(</span><span class="token string">'Network Error'</span><span class="token punctuation">,</span> config<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> request<span class="token punctuation">)</span><span class="token punctuation">)</span>
    131. 

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

  132. 

  133.       request<span class="token punctuation">.</span><span class="token function-variable function">ontimeout</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token function">handleTimeout</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    134. 

  134.         <span class="token function">reject</span><span class="token punctuation">(</span>
    135. 

  135.           <span class="token function">createError</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Timeout of </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>config<span class="token punctuation">.</span>timeout<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"> ms exceeded</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">,</span> config<span class="token punctuation">,</span> <span class="token string">'ECONNABORTED'</span><span class="token punctuation">,</span> request<span class="token punctuation">)</span>
    136. 

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

  137.       <span class="token punctuation">}</span>
    138. 

  138. 

  139.       <span class="token keyword">if</span> <span class="token punctuation">(</span>onDownloadProgress<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    140. 

  140.         request<span class="token punctuation">.</span>onprogress <span class="token operator">=</span> onDownloadProgress
    141. 

  141.       <span class="token punctuation">}</span>
    142. 

  142. 

  143.       <span class="token keyword">if</span> <span class="token punctuation">(</span>onUploadProgress<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    144. 

  144.         request<span class="token punctuation">.</span>upload<span class="token punctuation">.</span>onprogress <span class="token operator">=</span> onUploadProgress
    145. 

  145.       <span class="token punctuation">}</span>
    146. 

  146.     <span class="token punctuation">}</span>
    147. 

  147. 

  148.     <span class="token keyword">function</span> <span class="token function">processHeaders</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>
    149. 

  149.       <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isFormData</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    150. 

  150.         <span class="token keyword">delete</span> headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span>
    151. 

  151.       <span class="token punctuation">}</span>
    152. 

  152. 

  153.       <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>withCredentials <span class="token operator">||</span> <span class="token function">isURLSameOrigin</span><span class="token punctuation">(</span>url<span class="token operator">!</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> xsrfCookieName<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    154. 

  154.         <span class="token keyword">const</span> xsrfValue <span class="token operator">=</span> cookie<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span>xsrfCookieName<span class="token punctuation">)</span>
    155. 

  155.         <span class="token keyword">if</span> <span class="token punctuation">(</span>xsrfValue<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    156. 

  156.           headers<span class="token punctuation">[</span>xsrfHeaderName<span class="token operator">!</span><span class="token punctuation">]</span> <span class="token operator">=</span> xsrfValue
    157. 

  157.         <span class="token punctuation">}</span>
    158. 

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

  159. 

  160.       Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>name <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    161. 

  161.         <span class="token keyword">if</span> <span class="token punctuation">(</span>data <span class="token operator">===</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> name<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">===</span> <span class="token string">'content-type'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    162. 

  162.           <span class="token keyword">delete</span> headers<span class="token punctuation">[</span>name<span class="token punctuation">]</span>
    163. 

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

  164.           request<span class="token punctuation">.</span><span class="token function">setRequestHeader</span><span class="token punctuation">(</span>name<span class="token punctuation">,</span> headers<span class="token punctuation">[</span>name<span class="token punctuation">]</span><span class="token punctuation">)</span>
    165. 

  165.         <span class="token punctuation">}</span>
    166. 

  166.       <span class="token punctuation">}</span><span class="token punctuation">)</span>
    167. 

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

  168. 

  169.     <span class="token keyword">function</span> <span class="token function">processCancel</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>
    170. 

  170.       <span class="token keyword">if</span> <span class="token punctuation">(</span>cancelToken<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    171. 

  171.         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>
    172. 

  172.           request<span class="token punctuation">.</span><span class="token function">abort</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    173. 

  173.           <span class="token function">reject</span><span class="token punctuation">(</span>reason<span class="token punctuation">)</span>
    174. 

  174.         <span class="token punctuation">}</span><span class="token punctuation">)</span>
    175. 

  175.       <span class="token punctuation">}</span>
    176. 

  176.     <span class="token punctuation">}</span>
    177. 

  177. 

  178.     <span class="token keyword">function</span> <span class="token function">handleResponse</span><span class="token punctuation">(</span>response<span class="token operator">:</span> AxiosResponse<span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
    179. 

  179.       <span class="token keyword">if</span> <span class="token punctuation">(</span>response<span class="token punctuation">.</span>status <span class="token operator">&gt;=</span> <span class="token number">200</span> <span class="token operator">&amp;&amp;</span> response<span class="token punctuation">.</span>status <span class="token operator">&lt;</span> <span class="token number">300</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    180. 

  180.         <span class="token function">resolve</span><span class="token punctuation">(</span>response<span class="token punctuation">)</span>
    181. 

  181.       <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    182. 

  182.         <span class="token function">reject</span><span class="token punctuation">(</span>
    183. 

  183.           <span class="token function">createError</span><span class="token punctuation">(</span>
    184. 

  184.             <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Request failed with status code </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>response<span class="token punctuation">.</span>status<span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">,</span>
    185. 

  185.             config<span class="token punctuation">,</span>
    186. 

  186.             <span class="token keyword">null</span><span class="token punctuation">,</span>
    187. 

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

  188.             response
    189. 

  189.           <span class="token punctuation">)</span>
    190. 

  190.         <span class="token punctuation">)</span>
    191. 

  191.       <span class="token punctuation">}</span>
    192. 

  192.     <span class="token punctuation">}</span>
    193. 

  193.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    194. 

  194. <span class="token punctuation">}</span>
    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><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><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span 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class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br><span class="line-number">84</span><br><span class="line-number">85</span><br><span class="line-number">86</span><br><span class="line-number">87</span><br><span class="line-number">88</span><br><span class="line-number">89</span><br><span class="line-number">90</span><br><span class="line-number">91</span><br><span class="line-number">92</span><br><span class="line-number">93</span><br><span class="line-number">94</span><br><span class="line-number">95</span><br><span class="line-number">96</span><br><span class="line-number">97</span><br><span class="line-number">98</span><br><span class="line-number">99</span><br><span class="line-number">100</span><br><span class="line-number">101</span><br><span class="line-number">102</span><br><span class="line-number">103</span><br><span class="line-number">104</span><br><span class="line-number">105</span><br><span class="line-number">106</span><br><span class="line-number">107</span><br><span class="line-number">108</span><br><span class="line-number">109</span><br><span class="line-number">110</span><br><span class="line-number">111</span><br><span class="line-number">112</span><br><span class="line-number">113</span><br><span class="line-number">114</span><br><span class="line-number">115</span><br><span class="line-number">116</span><br><span class="line-number">117</span><br><span class="line-number">118</span><br><span class="line-number">119</span><br><span class="line-number">120</span><br><span class="line-number">121</span><br><span class="line-number">122</span><br><span class="line-number">123</span><br><span class="line-number">124</span><br><span class="line-number">125</span><br><span class="line-number">126</span><br><span class="line-number">127</span><br><span class="line-number">128</span><br><span class="line-number">129</span><br><span class="line-number">130</span><br><span class="line-number">131</span><br><span class="line-number">132</span><br><span class="line-number">133</span><br><span class="line-number">134</span><br><span class="line-number">135</span><br></div></div><p>我们把整个流程分为 7 步：</p> <ul><li>创建一个 <code>request</code> 实例。</li> <li>执行 <code>request.open</code> 方法初始化。</li> <li>执行 <code>configureRequest</code> 配置 <code>request</code> 对象。</li> <li>执行 <code>addEvents</code> 给 <code>request</code> 添加事件处理函数。</li> <li>执行 <code>processHeaders</code> 处理请求 <code>headers</code>。</li> <li>执行 <code>processCancel</code> 处理请求取消逻辑。</li> <li>执行 <code>request.send</code> 方法发送请求。</li></ul> <p>这样拆分后整个流程就会显得非常清晰，未来我们再去新增需求的时候代码也不会显得越来越臃肿。</p> <h2 id="demo-编写"><a href="#demo-编写" class="header-anchor">#</a> demo 编写</h2> <p>这节课的 demo 非常有意思，我们第一次给界面上增加了一些交互的按钮。</p> <p><code>examples/more/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>
    196. 

  196. <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>
    197. 

  197. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    198. 

  198.   <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>
    199. 

  199.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>More example<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    200. 

  200.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>link</span> <span class="token attr-name">rel</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>stylesheet<span class="token punctuation">&quot;</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>text/css<span class="token punctuation">&quot;</span></span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css<span class="token punctuation">&quot;</span></span><span class="token punctuation">/&gt;</span></span>
    201. 

  201. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
    202. 

  202. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    203. 

  203. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h1</span><span class="token punctuation">&gt;</span></span>file download<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h1</span><span class="token punctuation">&gt;</span></span>
    204. 

  204. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>
    205. 

  205.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>download<span class="token punctuation">&quot;</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>btn btn-primary<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>Download<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
    206. 

  206. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    207. 

  207. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h1</span><span class="token punctuation">&gt;</span></span>file upload<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h1</span><span class="token punctuation">&gt;</span></span>
    208. 

  208. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>form</span> <span class="token attr-name">role</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>form<span class="token punctuation">&quot;</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>form<span class="token punctuation">&quot;</span></span> <span class="token special-attr"><span class="token attr-name">onsubmit</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token value javascript language-javascript"><span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span></span><span class="token punctuation">&quot;</span></span></span><span class="token punctuation">&gt;</span></span>
    209. 

  209.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>file<span class="token punctuation">&quot;</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>file<span class="token punctuation">&quot;</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>form-control<span class="token punctuation">&quot;</span></span><span class="token punctuation">/&gt;</span></span>
    210. 

  210.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>upload<span class="token punctuation">&quot;</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>button<span class="token punctuation">&quot;</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>btn btn-primary<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>Upload<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
    211. 

  211. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>form</span><span class="token punctuation">&gt;</span></span>
    212. 

  212. 

  213. <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__/more.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>
    214. 

  214. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
    215. 

  215. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
    216. 

  216. </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></div></div><p>另外，我们为了友好地展示上传和下载进度，我们引入了一个开源库 <a href="https://github.com/rstacruz/nprogress" target="_blank" rel="noopener noreferrer">nprogress<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>，它可以在页面的顶部展示进度条。</p> <p><code>examples/more/app.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">const</span> instance <span class="token operator">=</span> axios<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    217. 

  217. 

  218. <span class="token keyword">function</span> <span class="token function">calculatePercentage</span><span class="token punctuation">(</span>loaded<span class="token operator">:</span> <span class="token builtin">number</span><span class="token punctuation">,</span> total<span class="token operator">:</span> <span class="token builtin">number</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    219. 

  219.   <span class="token keyword">return</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>loaded <span class="token operator">*</span> <span class="token number">1.0</span><span class="token punctuation">)</span> <span class="token operator">/</span> total
    220. 

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

  221. 

  222. <span class="token keyword">function</span> <span class="token function">loadProgressBar</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    223. 

  223.   <span class="token keyword">const</span> <span class="token function-variable function">setupStartProgress</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    224. 

  224.     instance<span class="token punctuation">.</span>interceptors<span class="token punctuation">.</span>request<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>config <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    225. 

  225.       NProgress<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    226. 

  226.       <span class="token keyword">return</span> config
    227. 

  227.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    228. 

  228.   <span class="token punctuation">}</span>
    229. 

  229. 

  230.   <span class="token keyword">const</span> <span class="token function-variable function">setupUpdateProgress</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    231. 

  231.     <span class="token keyword">const</span> <span class="token function-variable function">update</span> <span class="token operator">=</span> <span class="token punctuation">(</span>e<span class="token operator">:</span> ProgressEvent<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    232. 

  232.       <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>
    233. 

  233.       NProgress<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token function">calculatePercentage</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span>loaded<span class="token punctuation">,</span> e<span class="token punctuation">.</span>total<span class="token punctuation">)</span><span class="token punctuation">)</span>
    234. 

  234.     <span class="token punctuation">}</span>
    235. 

  235.     instance<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>onDownloadProgress <span class="token operator">=</span> update
    236. 

  236.     instance<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>onUploadProgress <span class="token operator">=</span> update
    237. 

  237.   <span class="token punctuation">}</span>
    238. 

  238. 

  239.   <span class="token keyword">const</span> <span class="token function-variable function">setupStopProgress</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    240. 

  240.     instance<span class="token punctuation">.</span>interceptors<span class="token punctuation">.</span>response<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>response <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    241. 

  241.       NProgress<span class="token punctuation">.</span><span class="token function">done</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    242. 

  242.       <span class="token keyword">return</span> response
    243. 

  243.     <span class="token punctuation">}</span><span class="token punctuation">,</span> error <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    244. 

  244.       NProgress<span class="token punctuation">.</span><span class="token function">done</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    245. 

  245.       <span class="token keyword">return</span> <span class="token builtin">Promise</span><span class="token punctuation">.</span><span class="token function">reject</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span>
    246. 

  246.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    247. 

  247.   <span class="token punctuation">}</span>
    248. 

  248. 

  249.   <span class="token function">setupStartProgress</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    250. 

  250.   <span class="token function">setupUpdateProgress</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    251. 

  251.   <span class="token function">setupStopProgress</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    252. 

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

  253. 

  254. <span class="token function">loadProgressBar</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    255. 

  255. 

  256. <span class="token keyword">const</span> downloadEl <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'download'</span><span class="token punctuation">)</span>
    257. 

  257. 

  258. downloadEl<span class="token operator">!</span><span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span> e <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    259. 

  259.   instance<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'https://img.mukewang.com/5cc01a7b0001a33718720632.jpg'</span><span class="token punctuation">)</span>
    260. 

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

  261. 

  262. <span class="token keyword">const</span> uploadEl <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'upload'</span><span class="token punctuation">)</span>
    263. 

  263. 

  264. uploadEl<span class="token operator">!</span><span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span> e <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    265. 

  265.   <span class="token keyword">const</span> data <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FormData</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    266. 

  266.   <span class="token keyword">const</span> fileEl <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'file'</span><span class="token punctuation">)</span> <span class="token keyword">as</span> HTMLInputElement
    267. 

  267.   <span class="token keyword">if</span> <span class="token punctuation">(</span>fileEl<span class="token punctuation">.</span>files<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    268. 

  268.     data<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">'file'</span><span class="token punctuation">,</span> fileEl<span class="token punctuation">.</span>files<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
    269. 

  269. 

  270.     instance<span class="token punctuation">.</span><span class="token function">post</span><span class="token punctuation">(</span><span class="token string">'/more/upload'</span><span class="token punctuation">,</span> data<span class="token punctuation">)</span>
    271. 

  271.   <span class="token punctuation">}</span>
    272. 

  272. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    273. 

  273. </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><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br></div></div><p>对于 <code>progress</code> 事件参数 <code>e</code>，会有 <code>e.total</code> 和 <code>e.loaded</code> 属性，表示进程总体的工作量和已经执行的工作量，我们可以根据这 2 个值算出当前进度，然后通过 <code>Nprogess.set</code> 设置。另外，我们通过配置请求拦截器和响应拦截器执行 <code>NProgress.start()</code> 和 <code>NProgress.done()</code>。</p> <p>我们给下载按钮绑定了一个 <code>click</code> 事件，请求一张图片，我们可以看到实时的进度；另外我们也给上传按钮绑定了一个 <code>click</code> 事件，上传我们选择的文件，同样也能看到实时进度。</p> <p>在服务端，我们为了处理上传请求，需要下载安装一个 <code>express</code> 的中间件 <code>connect-multiparty</code>，然后使用它。</p> <p><code>example/server.js</code>：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> multipart <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'connect-multiparty'</span><span class="token punctuation">)</span>
    274. 

  274. app<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span><span class="token function">multipart</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    275. 

  275.   <span class="token literal-property property">uploadDir</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'upload-file'</span><span class="token punctuation">)</span>
    276. 

  276. <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
    277. 

  277. 

  278. router<span class="token punctuation">.</span><span class="token function">post</span><span class="token punctuation">(</span><span class="token string">'/more/upload'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">req<span class="token punctuation">,</span> res</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    279. 

  279.   console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>req<span class="token punctuation">.</span>body<span class="token punctuation">,</span> req<span class="token punctuation">.</span>files<span class="token punctuation">)</span>
    280. 

  280.   res<span class="token punctuation">.</span><span class="token function">end</span><span class="token punctuation">(</span><span class="token string">'upload success!'</span><span class="token punctuation">)</span>
    281. 

  281. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    282. 

  282. </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>这里我们需要在 <code>examples</code> 目录下创建一个 <code>upload-file</code> 的空目录，用于存放上传的文件。</p> <p>通过这个中间件，我们就可以处理上传请求并且可以把上传的文件存储在 <code>upload-file</code> 目录下。</p> <p>为了保证代码正常运行，我们还需要在 <code>examples/webpack.config.js</code> 中添加 <code>css-loader</code> 和 <code>css-loader</code>，不要忘记先安装它们。</p> <p>至此，<code>ts-axios</code> 支持了上传下载进度事件的回调函数的配置，用户可以通过配置这俩函数实现对下载进度和上传进度的监控。下一节课我们来实现 http 的认证授权功能。</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》/10.ts-axios 更多功能实现/03.上传和下载的进度监控.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/390cb70e2b619449/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">XSRF 防御</div></a> <a href="/blog/pages/89cd6496c23159ae/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">HTTP 授权</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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    292. 

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