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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 open"><span>ts-axios 配置化实现</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/blog/pages/937e4de6b81edeca/" class="sidebar-link">合并配置的设计与实现</a></li><li><a href="/blog/pages/f5b627bfebba87fc/" aria-current="page" class="active sidebar-link">请求和响应配置化</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/f5b627bfebba87fc/#需求分析" class="sidebar-link">需求分析</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/f5b627bfebba87fc/#修改默认配置" class="sidebar-link">修改默认配置</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/f5b627bfebba87fc/#transform-逻辑重构" class="sidebar-link">transform 逻辑重构</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/f5b627bfebba87fc/#demo-编写" class="sidebar-link">demo 编写</a></li></ul></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,iVBORw0KGgoAAAANSUhEUgAAAB4AAAAeCAYAAAA7MK6iAAAAAXNSR0IArs4c6QAABH1JREFUSA3tVl1oHFUUPmdmd2ltklqbpJDiNnXFmgbFktho7YMPNiJSSZM0+CAYSkUELVhM6YuwIPpgoOKDqOBDC0XE2CQoNtQXBUFTTcCi+Wlh1V2TQExsUzcltd3M9Tt3ZjZzZ2fT+OJTL8yeM+eee757fmeJbq//KQL8X3DUSFOcfr7cRsRtxNQMWueeVzOkaITIGqQHNg5y8+jNW9ldM7A6nTpAjuolUikAwq7CE3WcM2RRDz+XGVgN3FptU/aUSlvq9Pa3iZ1+sgAqJyyAFqkipd9dqiwHF3P65YycLWc/6sqGrvoEoIp6DOFaX5h6+dnfjkWprwqsPk0dUGq5vySwDImC10KxFHgGL1SWoc92O3eVht09qdXNH11I2SsTsJYqMWzihqGMi+A+Garf3BAuuLI5oGlULyNfyB/HYNujwktOfRrMr5t77NmevqaUopx0grnKAyvVpmwUDB4x6FPXuGvYLTDwWsejwgtgkYKPqRJg8SV6xaiZ3ZTppGneS4yfH5/66fZSDHv+QZci/+h5c5UHtpy67JUqGppM0sh0Nc1dW6/N1W5Yoqat8/TU/VnadmdeW2PLLSyh0cvxBs3KbqTmwYPpxN4do/mzE8nEpvX/UMu2Wbp74zUAK5q6WkHns7V0eWkdPbPzd3rxkTGybadYySumVzhcaJFbs5UrEkQ/+CK8gF5dnh/6ciIZ73gwQ927L1IitoxKLXYP3SjYdOrHHfTZhRRlFyrorafPk20B3HPD1y2G3qKZME5Jcf3t/HUC13/8tSd++vqFveMUTwAUxSUFI1QekR1+bIze3D9MF2aq6cPvG72CgnldWCFqyRw3lwH8ZMerjTD9ElRO7Gv44wNpC90aASqGfVlz/Rx17srQ57/UU26hkhQqUB7dBR71WmzQhHUnblGmVOEw0jhbV1n9OlXUDCIRGaNV5Jp43N516fN7JmnTHdfp7Hgy0luO4aMhtkLL8Bi3bUWYvzh5Mn1dTxrL6QmGuRhGL/TiTTxRoEdTszSaq9GR0NGA3KdkOz3hqSV3MIDhQ5IVX/Ivx3umBti2es2h4eZby7x8br1rkf7Mo90AqC8aQ3sJeNzqFRu+vSANAQe3PL7l0HGOAdwDCeZYvNKeoZp1Qfs6Aipndh86HmFRi0LAnEO47wsqM6cdfjh3jBPUzhZy7nvlUfFsamED1VQt6aISHVymXZ/B2aCtIG8AI8xfobj2d3en1wWVhOeHELKmLQ1s211s88comkv4UCwWyF787mJdYXtNfhKAXVqnKTq8QZvGAGGOfaTo5pGZ/PwbUCr5+DPr/1J92JNHr9aOl/F3iI5+O1nfybsGxoimvZ3ViWSluDITw3P37mypheDIPY0tw7+O/5ApbkYw+zpfaUVu32Pi98+defdUhEpZkRFq0aqyNh9FuL9hpYbEm6iwi0z2REd09ZmyENEbuhjDWzKvZXTqKYaBIr3tt5kuPtQBZFvEUwHt60vfCNu41XsksH9Ij1BMMz1Y0OOunHNShFIP5868g5zeXmuLwL9T4b6Q2+KejgAAAABJRU5ErkJggg==">请求和响应配置化<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="请求和响应配置化"><a href="#请求和响应配置化" class="header-anchor">#</a> 请求和响应配置化</h1> <h2 id="需求分析"><a href="#需求分析" class="header-anchor">#</a> 需求分析</h2> <p>官方的 axios 库 给默认配置添加了 <code>transformRequest</code> 和 <code>transformResponse</code> 两个字段，它们的值是一个数组或者是一个函数。</p> <p>其中 <code>transformRequest</code> 允许你在将请求数据发送到服务器之前对其进行修改，这只适用于请求方法 <code>put</code>、<code>post</code> 和 <code>patch</code>，如果值是数组，则数组中的最后一个函数必须返回一个字符串或 <code>FormData</code>、<code>URLSearchParams</code>、<code>Blob</code> 等类型作为 <code>xhr.send</code> 方法的参数，而且在 <code>transform</code> 过程中可以修改  <code>headers</code> 对象。</p> <p>而 <code>transformResponse</code> 允许你在把响应数据传递给 <code>then</code> 或者 <code>catch</code> 之前对它们进行修改。</p> <p>当值为数组的时候，数组的每一个函数都是一个转换函数，数组中的函数就像管道一样依次执行，前者的输出作为后者的输入。</p> <p>举个例子：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  transformRequest<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> qs<span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token operator">...</span>axios<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>transformRequest<span class="token punctuation">]</span><span class="token punctuation">,</span>
  transformResponse<span class="token operator">:</span> <span class="token punctuation">[</span>axios<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>transformResponse<span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> data <span class="token operator">===</span> <span class="token string">'object'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      data<span class="token punctuation">.</span>b <span class="token operator">=</span> <span class="token number">2</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">return</span> data
  <span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
  url<span class="token operator">:</span> <span class="token string">'/config/post'</span><span class="token punctuation">,</span>
  method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
  data<span class="token operator">:</span> <span class="token punctuation">{</span>
    a<span class="token operator">:</span> <span class="token number">1</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</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></div></div><h2 id="修改默认配置"><a href="#修改默认配置" class="header-anchor">#</a> 修改默认配置</h2> <p>先修改 <code>AxiosRequestConfig</code> 的类型定义，添加 <code>transformRequest</code> 和 <code>transformResponse</code> 俩个可选属性。</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>
  <span class="token comment">// ...</span>
  transformRequest<span class="token operator">?</span><span class="token operator">:</span> AxiosTransformer <span class="token operator">|</span> AxiosTransformer<span class="token punctuation">[</span><span class="token punctuation">]</span>
  transformResponse<span class="token operator">?</span><span class="token operator">:</span> AxiosTransformer <span class="token operator">|</span> AxiosTransformer<span class="token punctuation">[</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span>

<span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">AxiosTransformer</span> <span class="token punctuation">{</span>
  <span class="token punctuation">(</span>data<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> headers<span class="token operator">?</span><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>
</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>接着修改默认配置，如下：</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> processHeaders <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./helpers/headers'</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> transformRequest<span class="token punctuation">,</span> transformResponse <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./helpers/data'</span>

<span class="token keyword">const</span> defaults<span class="token operator">:</span> AxiosRequestConfig <span class="token operator">=</span> <span class="token punctuation">{</span>
  <span class="token comment">// ...</span>
  transformRequest<span class="token operator">:</span> <span class="token punctuation">[</span>
    <span class="token keyword">function</span><span class="token punctuation">(</span>data<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> headers<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>
      <span class="token function">processHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> data<span class="token punctuation">)</span>
      <span class="token keyword">return</span> <span class="token function">transformRequest</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">]</span><span class="token punctuation">,</span>

  transformResponse<span class="token operator">:</span> <span class="token punctuation">[</span>
    <span class="token keyword">function</span><span class="token punctuation">(</span>data<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>
      <span class="token keyword">return</span> <span class="token function">transformResponse</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">]</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br></div></div><p>我们把之前对请求数据和响应数据的处理逻辑，放到了默认配置中，也就是默认处理逻辑。</p> <h2 id="transform-逻辑重构"><a href="#transform-逻辑重构" class="header-anchor">#</a> transform 逻辑重构</h2> <p>接下来，我们就要重构之前写的对请求数据和响应数据的处理逻辑了。由于我们可能会编写多个转换函数，我们先定义一个 <code>transform</code> 函数来处理这些转换函数的调用逻辑。</p> <p><code>core/transform.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> AxiosTransformer <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../types'</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">function</span> <span class="token function">transform</span><span class="token punctuation">(</span>
  data<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span>
  headers<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span>
  fns<span class="token operator">?</span><span class="token operator">:</span> AxiosTransformer <span class="token operator">|</span> AxiosTransformer<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>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>fns<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> data
  <span class="token punctuation">}</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token builtin">Array</span><span class="token punctuation">.</span><span class="token function">isArray</span><span class="token punctuation">(</span>fns<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    fns <span class="token operator">=</span> <span class="token punctuation">[</span>fns<span class="token punctuation">]</span>
  <span class="token punctuation">}</span>
  fns<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>fn <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    data <span class="token operator">=</span> <span class="token function">fn</span><span class="token punctuation">(</span>data<span class="token punctuation">,</span> headers<span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token keyword">return</span> data
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br></div></div><p><code>transform</code> 函数中接收 <code>data</code>、<code>headers</code>、<code>fns</code> 3 个参数，其中 <code>fns</code> 代表一个或者多个转换函数，内部逻辑很简单，遍历 <code>fns</code>，执行这些转换函数，并且把 <code>data</code> 和 <code>headers</code> 作为参数传入，每个转换函数返回的 <code>data</code> 会作为下一个转换函数的参数 <code>data</code> 传入。</p> <p>接下来修改对请求数据和响应数据的处理逻辑。</p> <p><code>dispatchRequest.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>
<span class="token keyword">import</span> transform <span class="token keyword">from</span> <span class="token string">'./transform'</span>

<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>
  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>
  config<span class="token punctuation">.</span>data <span class="token operator">=</span> <span class="token function">transform</span><span class="token punctuation">(</span>config<span class="token punctuation">.</span>data<span class="token punctuation">,</span> config<span class="token punctuation">.</span>headers<span class="token punctuation">,</span> config<span class="token punctuation">.</span>transformRequest<span class="token punctuation">)</span>
  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>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">transformResponseData</span><span class="token punctuation">(</span>res<span class="token operator">:</span> AxiosResponse<span class="token punctuation">)</span><span class="token operator">:</span> AxiosResponse <span class="token punctuation">{</span>
  res<span class="token punctuation">.</span>data <span class="token operator">=</span> <span class="token function">transform</span><span class="token punctuation">(</span>res<span class="token punctuation">.</span>data<span class="token punctuation">,</span> res<span class="token punctuation">.</span>headers<span class="token punctuation">,</span> res<span class="token punctuation">.</span>config<span class="token punctuation">.</span>transformResponse<span class="token punctuation">)</span>
  <span class="token keyword">return</span> res
<span class="token punctuation">}</span>
</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>我们把对请求数据的处理和对响应数据的处理改成使用 <code>transform</code> 函数实现，并把配置中的 <code>transformRequest</code> 及 <code>transformResponse</code> 分别传入。</p> <h2 id="demo-编写"><a href="#demo-编写" class="header-anchor">#</a> demo 编写</h2> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  transformRequest<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> qs<span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token operator">...</span><span class="token punctuation">(</span>axios<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>transformRequest <span class="token keyword">as</span> AxiosTransformer<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
  transformResponse<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token operator">...</span><span class="token punctuation">(</span>axios<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>transformResponse <span class="token keyword">as</span> AxiosTransformer<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> data <span class="token operator">===</span> <span class="token string">'object'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      data<span class="token punctuation">.</span>b <span class="token operator">=</span> <span class="token number">2</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">return</span> data
  <span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
  url<span class="token operator">:</span> <span class="token string">'/config/post'</span><span class="token punctuation">,</span>
  method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
  data<span class="token operator">:</span> <span class="token punctuation">{</span>
    a<span class="token operator">:</span> <span class="token number">1</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><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>
  <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>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br></div></div><p>我们对 <code>transformRequest</code> 做了修改，在执行它默认的 <code>transformRequest</code> 之前，我们先用 <code>qs.stringify</code> 库对传入的数据 <code>data</code> 做了一层转换。同时也对 <code>transformResponse</code> 做了修改，在执行完默认的 <code>transformResponse</code> 后，会给响应的 <code>data</code> 对象添加一个 <code>data.b = 2</code>。</p> <p>因为之前我们实现了配置的合并，而且我们传入的 <code>transformRequest</code> 和 <code>transformResponse</code> 遵循默认合并策略，它们会覆盖默认的值。</p> <p>至此，我们就实现了请求和响应的配置化。到目前为止，我们的 axios 都是一个单例，一旦我们修改了 axios 的默认配置，会影响所有的请求。官网提供了一个 <code>axios.create</code> 的工厂方法允许我们创建一个新的 <code>axios</code> 实例，同时允许我们传入新的配置和默认配置合并，并做为新的默认配置。下面一节课我们就来实现这个 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/02.请求和响应配置化.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/937e4de6b81edeca/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">合并配置的设计与实现</div></a> <a href="/blog/pages/7b49658c26f613bf/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">扩展 create 静态接口</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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