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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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href="/blog/pages/937e4de6b81edeca/" aria-current="page" class="active sidebar-link">合并配置的设计与实现</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/937e4de6b81edeca/#需求分析" class="sidebar-link">需求分析</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/937e4de6b81edeca/#默认配置" class="sidebar-link">默认配置</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/blog/pages/937e4de6b81edeca/#默认配置定义" class="sidebar-link">默认配置定义</a></li><li class="sidebar-sub-header level3"><a href="/blog/pages/937e4de6b81edeca/#添加到-axios-对象中" class="sidebar-link">添加到 axios 对象中</a></li></ul></li><li class="sidebar-sub-header level2"><a href="/blog/pages/937e4de6b81edeca/#配置合并及策略" class="sidebar-link">配置合并及策略</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/blog/pages/937e4de6b81edeca/#合并方法" class="sidebar-link">合并方法</a></li><li class="sidebar-sub-header level3"><a href="/blog/pages/937e4de6b81edeca/#默认合并策略" class="sidebar-link">默认合并策略</a></li><li class="sidebar-sub-header level3"><a href="/blog/pages/937e4de6b81edeca/#只接受自定义配置合并策略" class="sidebar-link">只接受自定义配置合并策略</a></li><li class="sidebar-sub-header level3"><a href="/blog/pages/937e4de6b81edeca/#复杂对象合并策略" class="sidebar-link">复杂对象合并策略</a></li></ul></li><li class="sidebar-sub-header level2"><a href="/blog/pages/937e4de6b81edeca/#flatten-headers" class="sidebar-link">flatten headers</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/937e4de6b81edeca/#demo-编写" class="sidebar-link">demo 编写</a></li></ul></li><li><a href="/blog/pages/f5b627bfebba87fc/" class="sidebar-link">请求和响应配置化</a></li><li><a href="/blog/pages/7b49658c26f613bf/" class="sidebar-link">扩展 create 静态接口</a></li></ul></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"><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-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 配置化实现" data-v-06970110>ts-axios 配置化实现</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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">合并配置的设计与实现<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="合并配置的设计与实现"><a href="#合并配置的设计与实现" class="header-anchor">#</a> 合并配置的设计与实现</h1> <h2 id="需求分析"><a href="#需求分析" class="header-anchor">#</a> 需求分析</h2> <p>在之前的章节我们了解到，在发送请求的时候可以传入一个配置，来决定请求的不同行为。我们也希望 <code>ts-axios</code> 可以有默认配置，定义一些默认的行为。这样在发送每个请求，用户传递的配置可以和默认配置做一层合并。</p> <p>和官网 <code>axios</code> 库保持一致，我们给 <code>axios</code> 对象添加一个 <code>defaults</code> 属性，表示默认配置，你甚至可以直接修改这些默认配置：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>axios<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>headers<span class="token punctuation">.</span>common<span class="token punctuation">[</span><span class="token string">'test'</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">123</span>
    26. 

  26. axios<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>headers<span class="token punctuation">.</span>post<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token string">'application/x-www-form-urlencoded'</span>
    27. 

  27. axios<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>timeout <span class="token operator">=</span> <span class="token number">2000</span>
    28. 

  28. </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>其中对于 <code>headers</code> 的默认配置支持 <code>common</code> 和一些请求 <code>method</code> 字段，<code>common</code> 表示对于任何类型的请求都要添加该属性，而 <code>method</code> 表示只有该类型请求方法才会添加对应的属性。</p> <p>在上述例子中，我们会默认为所有请求的 <code>header</code> 添加 <code>test</code> 属性，会默认为 <code>post</code> 请求的 <code>header</code> 添加 <code>Content-Type</code> 属性。</p> <h2 id="默认配置"><a href="#默认配置" class="header-anchor">#</a> 默认配置</h2> <h3 id="默认配置定义"><a href="#默认配置定义" class="header-anchor">#</a> 默认配置定义</h3> <p>接下来，我们先实现默认配置</p> <p><code>defaults.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> AxiosRequestConfig <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./types'</span>
    29. 

  29. 

  30. <span class="token keyword">const</span> defaults<span class="token operator">:</span> AxiosRequestConfig <span class="token operator">=</span> <span class="token punctuation">{</span>
    31. 

  31.   method<span class="token operator">:</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
    32. 

  32. 

  33.   timeout<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
    34. 

  34. 

  35.   headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    36. 

  36.     common<span class="token operator">:</span> <span class="token punctuation">{</span>
    37. 

  37.       Accept<span class="token operator">:</span> <span class="token string">'application/json, text/plain, */*'</span>
    38. 

  38.     <span class="token punctuation">}</span>
    39. 

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

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

  41. 

  42. <span class="token keyword">const</span> methodsNoData <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">'delete'</span><span class="token punctuation">,</span> <span class="token string">'get'</span><span class="token punctuation">,</span> <span class="token string">'head'</span><span class="token punctuation">,</span> <span class="token string">'options'</span><span class="token punctuation">]</span>
    43. 

  43. 

  44. methodsNoData<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>method <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    45. 

  45.   defaults<span class="token punctuation">.</span>headers<span class="token punctuation">[</span>method<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
    46. 

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

  47. 

  48. <span class="token keyword">const</span> methodsWithData <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">'post'</span><span class="token punctuation">,</span> <span class="token string">'put'</span><span class="token punctuation">,</span> <span class="token string">'patch'</span><span class="token punctuation">]</span>
    49. 

  49. 

  50. methodsWithData<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>method <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    51. 

  51.   defaults<span class="token punctuation">.</span>headers<span class="token punctuation">[</span>method<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span>
    52. 

  52.     <span class="token string-property property">'Content-Type'</span><span class="token operator">:</span> <span class="token string">'application/x-www-form-urlencoded'</span>
    53. 

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

  54. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    55. 

  55. 

  56. <span class="token keyword">export</span> <span class="token keyword">default</span> defaults
    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><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></div></div><p>我们定义了 <code>defaults</code> 常量，它包含默认请求的方法、超时时间，以及 <code>headers</code> 配置。</p> <p>未来我们会根据新的需求添加更多的默认配置。</p> <h3 id="添加到-axios-对象中"><a href="#添加到-axios-对象中" class="header-anchor">#</a> 添加到 axios 对象中</h3> <p>根据需求，我们要给 <code>axios</code> 对象添加一个 <code>defaults</code> 属性，表示默认配置：</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">Axios</span> <span class="token punctuation">{</span>
    58. 

  58.   defaults<span class="token operator">:</span> AxiosRequestConfig
    59. 

  59.   interceptors<span class="token operator">:</span> Interceptors
    60. 

  60. 

  61.   <span class="token function">constructor</span><span class="token punctuation">(</span>initConfig<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    62. 

  62.     <span class="token keyword">this</span><span class="token punctuation">.</span>defaults <span class="token operator">=</span> initConfig
    63. 

  63.     <span class="token keyword">this</span><span class="token punctuation">.</span>interceptors <span class="token operator">=</span> <span class="token punctuation">{</span>
    64. 

  64.       request<span class="token operator">:</span> <span class="token keyword">new</span> <span class="token class-name">InterceptorManager<span class="token operator">&lt;</span>AxiosRequestConfig<span class="token operator">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    65. 

  65.       response<span class="token operator">:</span> <span class="token keyword">new</span> <span class="token class-name">InterceptorManager<span class="token operator">&lt;</span>AxiosResponse<span class="token operator">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    66. 

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

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

  68.   <span class="token comment">// ...</span>
    69. 

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

  70. </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>我们给 <code>Axios</code> 类添加一个 <code>defaults</code> 成员属性，并且让 <code>Axios</code> 的构造函数接受一个 <code>initConfig</code> 对象，把 <code>initConfig</code> 赋值给 <code>this.defaults</code>。</p> <p>接着修改 <code>createInstance</code> 方法，支持传入 <code>config</code> 对象。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> defaults <span class="token keyword">from</span> <span class="token string">'./defaults'</span>
    71. 

  71. 

  72. <span class="token keyword">function</span> <span class="token function">createInstance</span><span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosStatic <span class="token punctuation">{</span>
    73. 

  73.   <span class="token keyword">const</span> context <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Axios</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    74. 

  74.   <span class="token keyword">const</span> instance <span class="token operator">=</span> Axios<span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">request</span><span class="token punctuation">.</span><span class="token function">bind</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span>
    75. 

  75. 

  76.   <span class="token comment">// extend(instance, Axios.prototype, context)</span>
    77. 

  77. 

  78.   <span class="token function">extend</span><span class="token punctuation">(</span>instance<span class="token punctuation">,</span> context<span class="token punctuation">)</span>
    79. 

  79. 

  80.   <span class="token keyword">return</span> instance <span class="token keyword">as</span> AxiosStatic
    81. 

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

  82. 

  83. <span class="token keyword">const</span> axios <span class="token operator">=</span> <span class="token function">createInstance</span><span class="token punctuation">(</span>defaults<span class="token punctuation">)</span>
    84. 

  84. </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>这样我们就可以在执行 <code>createInstance</code> 创建 <code>axios</code> 对象的时候，把默认配置传入了。</p> <h2 id="配置合并及策略"><a href="#配置合并及策略" class="header-anchor">#</a> 配置合并及策略</h2> <p>定义了默认配置后，我们发送每个请求的时候需要把自定义配置和默认配置做合并，它并不是简单的 2 个普通对象的合并，对于不同的字段合并，会有不同的合并策略。举个例子：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>config1 <span class="token operator">=</span> <span class="token punctuation">{</span>
    85. 

  85.   method<span class="token operator">:</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
    86. 

  86. 

  87.   timeout<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
    88. 

  88. 

  89.   headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    90. 

  90.     common<span class="token operator">:</span> <span class="token punctuation">{</span>
    91. 

  91.       Accept<span class="token operator">:</span> <span class="token string">'application/json, text/plain, */*'</span>
    92. 

  92.     <span class="token punctuation">}</span>
    93. 

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

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

  95. 

  96. config2 <span class="token operator">=</span> <span class="token punctuation">{</span>
    97. 

  97.   url<span class="token operator">:</span> <span class="token string">'/config/post'</span><span class="token punctuation">,</span>
    98. 

  98.   method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
    99. 

  99.   data<span class="token operator">:</span> <span class="token punctuation">{</span>
    100. 

  100.     a<span class="token operator">:</span> <span class="token number">1</span>
    101. 

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

  102.   headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    103. 

  103.     test<span class="token operator">:</span> <span class="token string">'321'</span>
    104. 

  104.   <span class="token punctuation">}</span>
    105. 

  105. <span class="token punctuation">}</span>
    106. 

  106. 

  107. merged <span class="token operator">=</span> <span class="token punctuation">{</span>
    108. 

  108.   url<span class="token operator">:</span> <span class="token string">'/config/post'</span><span class="token punctuation">,</span>
    109. 

  109.   method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
    110. 

  110.   data<span class="token operator">:</span> <span class="token punctuation">{</span>
    111. 

  111.     a<span class="token operator">:</span> <span class="token number">1</span>
    112. 

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

  113.   timeout<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
    114. 

  114.   headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    115. 

  115.     common<span class="token operator">:</span> <span class="token punctuation">{</span>
    116. 

  116.       Accept<span class="token operator">:</span> <span class="token string">'application/json, text/plain, */*'</span>
    117. 

  117.     <span class="token punctuation">}</span>
    118. 

  118.     test<span class="token operator">:</span> <span class="token string">'321'</span>
    119. 

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

  120. <span class="token punctuation">}</span>
    121. 

  121. </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></div></div><p>我们在 <code>core/mergeConfig.ts</code> 中实现合并方法。</p> <h3 id="合并方法"><a href="#合并方法" class="header-anchor">#</a> 合并方法</h3> <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">mergeConfig</span><span class="token punctuation">(</span>
    122. 

  122.   config1<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">,</span>
    123. 

  123.   config2<span class="token operator">?</span><span class="token operator">:</span> AxiosRequestConfig
    124. 

  124. <span class="token punctuation">)</span><span class="token operator">:</span> AxiosRequestConfig <span class="token punctuation">{</span>
    125. 

  125.   <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>config2<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    126. 

  126.     config2 <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
    127. 

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

  128. 

  129.   <span class="token keyword">const</span> config <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span>
    130. 

  130. 

  131.   <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> key <span class="token keyword">in</span> config2<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    132. 

  132.     <span class="token function">mergeField</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span>
    133. 

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

  134. 

  135.   <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> key <span class="token keyword">in</span> config1<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    136. 

  136.     <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>config2<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    137. 

  137.       <span class="token function">mergeField</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span>
    138. 

  138.     <span class="token punctuation">}</span>
    139. 

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

  140. 

  141.   <span class="token keyword">function</span> <span class="token function">mergeField</span><span class="token punctuation">(</span>key<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> <span class="token punctuation">{</span>
    142. 

  142.     <span class="token keyword">const</span> strat <span class="token operator">=</span> strats<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">||</span> defaultStrat
    143. 

  143.     config<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">strat</span><span class="token punctuation">(</span>config1<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">,</span> config2<span class="token operator">!</span><span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">)</span>
    144. 

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

  145. 

  146.   <span class="token keyword">return</span> config
    147. 

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

  148. </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></div></div><p>合并方法的整体思路就是对 <code>config1</code> 和 <code>config2</code> 中的属性遍历，执行 <code>mergeField</code> 方法做合并，这里 <code>config1</code> 代表默认配置，<code>config2</code> 代表自定义配置。</p> <p>遍历过程中，我们会通过 <code>config2[key]</code> 这种索引的方式访问，所以需要给 <code>AxiosRequestConfig</code> 的接口定义添加一个字符串索引签名：</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>
    149. 

  149.   <span class="token comment">// ...</span>
    150. 

  150. 

  151.   <span class="token punctuation">[</span>propName<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">]</span><span class="token operator">:</span> <span class="token builtin">any</span>
    152. 

  152. <span class="token punctuation">}</span>
    153. 

  153. </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>在 <code>mergeField</code> 方法中，我们会针对不同的属性使用不同的合并策略。</p> <h3 id="默认合并策略"><a href="#默认合并策略" class="header-anchor">#</a> 默认合并策略</h3> <p>这是大部分属性的合并策略，如下：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token function">defaultStrat</span><span class="token punctuation">(</span>val1<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> val2<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">any</span> <span class="token punctuation">{</span>
    154. 

  154.   <span class="token keyword">return</span> <span class="token keyword">typeof</span> val2 <span class="token operator">!==</span> <span class="token string">'undefined'</span> <span class="token operator">?</span> val2 <span class="token operator">:</span> val1
    155. 

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

  156. </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>它很简单，如果有 <code>val2</code> 则返回 <code>val2</code>，否则返回 <code>val1</code>，也就是如果自定义配置中定义了某个属性，就采用自定义的，否则就用默认配置。</p> <h3 id="只接受自定义配置合并策略"><a href="#只接受自定义配置合并策略" class="header-anchor">#</a> 只接受自定义配置合并策略</h3> <p>对于一些属性如 <code>url</code>、<code>params</code>、<code>data</code>，合并策略如下：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token function">fromVal2Strat</span><span class="token punctuation">(</span>val1<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> val2<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">any</span> <span class="token punctuation">{</span>
    157. 

  157.   <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> val2 <span class="token operator">!==</span> <span class="token string">'undefined'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    158. 

  158.     <span class="token keyword">return</span> val2
    159. 

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

  160. <span class="token punctuation">}</span>
    161. 

  161. 

  162. <span class="token keyword">const</span> stratKeysFromVal2 <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">'url'</span><span class="token punctuation">,</span> <span class="token string">'params'</span><span class="token punctuation">,</span> <span class="token string">'data'</span><span class="token punctuation">]</span>
    163. 

  163. 

  164. stratKeysFromVal2<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>key <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    165. 

  165.   strats<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> fromVal2Strat
    166. 

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

  167. </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>因为对于 <code>url</code>、<code>params</code>、<code>data</code> 这些属性，默认配置显然是没有意义的，它们是和每个请求强相关的，所以我们只从自定义配置中获取。</p> <h3 id="复杂对象合并策略"><a href="#复杂对象合并策略" class="header-anchor">#</a> 复杂对象合并策略</h3> <p>对于一些属性如 <code>headers</code>，合并策略如下：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token function">deepMergeStrat</span><span class="token punctuation">(</span>val1<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> val2<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">any</span> <span class="token punctuation">{</span>
    168. 

  168.   <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isPlainObject</span><span class="token punctuation">(</span>val2<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    169. 

  169.     <span class="token keyword">return</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>val1<span class="token punctuation">,</span> val2<span class="token punctuation">)</span>
    170. 

  170.   <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> val2 <span class="token operator">!==</span> <span class="token string">'undefined'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    171. 

  171.     <span class="token keyword">return</span> val2
    172. 

  172.   <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isPlainObject</span><span class="token punctuation">(</span>val1<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    173. 

  173.     <span class="token keyword">return</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>val1<span class="token punctuation">)</span>
    174. 

  174.   <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> val1 <span class="token operator">!==</span> <span class="token string">'undefined'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    175. 

  175.     <span class="token keyword">return</span> val1
    176. 

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

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

  178. 

  179. <span class="token keyword">const</span> stratKeysDeepMerge <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">'headers'</span><span class="token punctuation">]</span>
    180. 

  180. 

  181. stratKeysDeepMerge<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>key <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    182. 

  182.   strats<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> deepMergeStrat
    183. 

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

  184. </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></div></div><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">deepMerge</span><span class="token punctuation">(</span><span class="token operator">...</span>objs<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">any</span> <span class="token punctuation">{</span>
    185. 

  185.   <span class="token keyword">const</span> result <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span>
    186. 

  186. 

  187.   objs<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>obj <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    188. 

  188.     <span class="token keyword">if</span> <span class="token punctuation">(</span>obj<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    189. 

  189.       Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>key <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    190. 

  190.         <span class="token keyword">const</span> val <span class="token operator">=</span> obj<span class="token punctuation">[</span>key<span class="token punctuation">]</span>
    191. 

  191.         <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isPlainObject</span><span class="token punctuation">(</span>val<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    192. 

  192.           <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isPlainObject</span><span class="token punctuation">(</span>result<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    193. 

  193.             result<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>result<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">,</span> val<span class="token punctuation">)</span>
    194. 

  194.           <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    195. 

  195.             result<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> val<span class="token punctuation">)</span>
    196. 

  196.           <span class="token punctuation">}</span>
    197. 

  197.         <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    198. 

  198.           result<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> val
    199. 

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

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

  201.     <span class="token punctuation">}</span>
    202. 

  202.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    203. 

  203. 

  204.   <span class="token keyword">return</span> result
    205. 

  205. <span class="token punctuation">}</span>
    206. 

  206. </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></div></div><p>对于 <code>headers</code> 这类的复杂对象属性，我们需要使用深拷贝的方式，同时也处理了其它一些情况，因为它们也可能是一个非对象的普通值。未来我们讲到认证授权的时候，<code>auth</code> 属性也是这个合并策略。</p> <p>最后我们在 <code>request</code> 方法里添加合并配置的逻辑：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>config <span class="token operator">=</span> <span class="token function">mergeConfig</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>defaults<span class="token punctuation">,</span> config<span class="token punctuation">)</span>
    207. 

  207. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="flatten-headers"><a href="#flatten-headers" class="header-anchor">#</a> flatten headers</h2> <p>经过合并后的配置中的 <code>headers</code> 是一个复杂对象，多了 <code>common</code>、<code>post</code>、<code>get</code> 等属性，而这些属性中的值才是我们要真正添加到请求 <code>header</code> 中的。</p> <p>举个例子：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    208. 

  208.   common<span class="token operator">:</span> <span class="token punctuation">{</span>
    209. 

  209.     Accept<span class="token operator">:</span> <span class="token string">'application/json, text/plain, */*'</span>
    210. 

  210.   <span class="token punctuation">}</span><span class="token punctuation">,</span>
    211. 

  211.   post<span class="token operator">:</span> <span class="token punctuation">{</span>
    212. 

  212.     <span class="token string-property property">'Content-Type'</span><span class="token operator">:</span><span class="token string">'application/x-www-form-urlencoded'</span>
    213. 

  213.   <span class="token punctuation">}</span>
    214. 

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

  215. </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>我们需要把它压成一级的，如下：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    216. 

  216.   Accept<span class="token operator">:</span> <span class="token string">'application/json, text/plain, */*'</span><span class="token punctuation">,</span>
    217. 

  217.  <span class="token string-property property">'Content-Type'</span><span class="token operator">:</span><span class="token string">'application/x-www-form-urlencoded'</span>
    218. 

  218. <span class="token punctuation">}</span>
    219. 

  219. </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>这里要注意的是，对于 <code>common</code> 中定义的 <code>header</code> 字段，我们都要提取，而对于 <code>post</code>、<code>get</code> 这类提取，需要和该次请求的方法对应。</p> <p>接下来我们实现 <code>flattenHeaders</code> 方法。</p> <p><code>helpers/header.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">flattenHeaders</span><span class="token punctuation">(</span>headers<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> method<span class="token operator">:</span> Method<span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">any</span> <span class="token punctuation">{</span>
    220. 

  220.   <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>headers<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    221. 

  221.     <span class="token keyword">return</span> headers
    222. 

  222.   <span class="token punctuation">}</span>
    223. 

  223.   headers <span class="token operator">=</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>headers<span class="token punctuation">.</span>common <span class="token operator">||</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> headers<span class="token punctuation">[</span>method<span class="token punctuation">]</span> <span class="token operator">||</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> headers<span class="token punctuation">)</span>
    224. 

  224. 

  225.   <span class="token keyword">const</span> methodsToDelete <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">'delete'</span><span class="token punctuation">,</span> <span class="token string">'get'</span><span class="token punctuation">,</span> <span class="token string">'head'</span><span class="token punctuation">,</span> <span class="token string">'options'</span><span class="token punctuation">,</span> <span class="token string">'post'</span><span class="token punctuation">,</span> <span class="token string">'put'</span><span class="token punctuation">,</span> <span class="token string">'patch'</span><span class="token punctuation">,</span> <span class="token string">'common'</span><span class="token punctuation">]</span>
    226. 

  226. 

  227.   methodsToDelete<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>method <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    228. 

  228.     <span class="token keyword">delete</span> headers<span class="token punctuation">[</span>method<span class="token punctuation">]</span>
    229. 

  229.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    230. 

  230. 

  231.   <span class="token keyword">return</span> headers
    232. 

  232. <span class="token punctuation">}</span>
    233. 

  233. </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>我们可以通过 <code>deepMerge</code> 的方式把 <code>common</code>、<code>post</code> 的属性拷贝到 <code>headers</code> 这一级，然后再把 <code>common</code>、<code>post</code> 这些属性删掉。</p> <p>然后我们在真正发送请求前执行这个逻辑。</p> <p><code>core/dispatchRequest.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token function">processConfig</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>
    234. 

  234.   config<span class="token punctuation">.</span>url <span class="token operator">=</span> <span class="token function">transformURL</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    235. 

  235.   config<span class="token punctuation">.</span>headers <span class="token operator">=</span> <span class="token function">transformHeaders</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    236. 

  236.   config<span class="token punctuation">.</span>data <span class="token operator">=</span> <span class="token function">transformRequestData</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    237. 

  237.   config<span class="token punctuation">.</span>headers <span class="token operator">=</span> <span class="token function">flattenHeaders</span><span class="token punctuation">(</span>config<span class="token punctuation">.</span>headers<span class="token punctuation">,</span> config<span class="token punctuation">.</span>method<span class="token operator">!</span><span class="token punctuation">)</span>
    238. 

  238. <span class="token punctuation">}</span>
    239. 

  239. </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>这样确保我们了配置中的 <code>headers</code> 是可以正确添加到请求 <code>header</code> 中的</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>config</code> 目录，在 <code>config</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>
    240. 

  240. <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>
    241. 

  241.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    242. 

  242.     <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>
    243. 

  243.     <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Config example<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    244. 

  244.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
    245. 

  245.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    246. 

  246.     <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__/config.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>
    247. 

  247.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
    248. 

  248. <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
    249. 

  249. </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 keyword">from</span> <span class="token string">'../../src/index'</span>
    250. 

  250. <span class="token keyword">import</span> qs <span class="token keyword">from</span> <span class="token string">'qs'</span>
    251. 

  251. 

  252. axios<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>headers<span class="token punctuation">.</span>common<span class="token punctuation">[</span><span class="token string">'test2'</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">123</span>
    253. 

  253. 

  254. <span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    255. 

  255.   url<span class="token operator">:</span> <span class="token string">'/config/post'</span><span class="token punctuation">,</span>
    256. 

  256.   method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
    257. 

  257.   data<span class="token operator">:</span> qs<span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    258. 

  258.     a<span class="token operator">:</span> <span class="token number">1</span>
    259. 

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

  260.   headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    261. 

  261.     test<span class="token operator">:</span> <span class="token string">'321'</span>
    262. 

  262.   <span class="token punctuation">}</span>
    263. 

  263. <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span>res<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    264. 

  264.   <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>res<span class="token punctuation">.</span>data<span class="token punctuation">)</span>
    265. 

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

  266. </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></div></div><p>这个例子中我们额外引入了 <code>qs</code> 库，它是一个查询字符串解析和字符串化的库。</p> <p>比如我们的例子中对于 <code>{a:1}</code> 经过 <code>qs.stringify</code> 变成 <code>a=1</code>。</p> <p>由于我们的例子给默认值添加了 <code>post</code> 和 <code>common</code> 的 <code>headers</code>，我们在请求前做配置合并，于是我们请求的 <code>header</code> 就添加了 <code>Content-Type</code> 字段，它的值是 <code>application/x-www-form-urlencoded</code>；另外我们也添加了 <code>test2</code> 字段，它的值是 <code>123</code>。</p> <p>至此，我们合并配置的逻辑就实现完了。我们在前面的章节编写 <code>axios</code> 的基础功能的时候对请求数据和响应数据都做了处理，官方 <code>axios</code> 则把这俩部分逻辑也做到了默认配置中，意味这用户可以去修改这俩部分的逻辑，实现自己对请求和响应数据处理的逻辑。那么下一节我们就来实现这个 feature。</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》/08.ts-axios 配置化实现/01.合并配置的设计与实现.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/70651900f022f586/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">拦截器设计与实现</div></a> <a href="/blog/pages/f5b627bfebba87fc/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">请求和响应配置化</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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