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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 open"><span>ts-axios 接口扩展</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/blog/pages/034e320f4af88bd4/" class="sidebar-link">扩展接口</a></li><li><a href="/blog/pages/8af227eae851ec97/" class="sidebar-link">axios 函数重载</a></li><li><a href="/blog/pages/c4489d0bab02cc0c/" aria-current="page" class="active sidebar-link">响应数据支持泛型</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/c4489d0bab02cc0c/#需求分析" class="sidebar-link">需求分析</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/c4489d0bab02cc0c/#接口添加泛型参数" class="sidebar-link">接口添加泛型参数</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/c4489d0bab02cc0c/#demo-编写" class="sidebar-link">demo 编写</a></li></ul></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 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"><span>ts-axios 更多功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 单元测试</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 部署与发布</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-06225672><div class="articleInfo" data-v-06225672><ul class="breadcrumbs" data-v-06225672><li data-v-06225672><a href="/blog/" title="首页" class="iconfont icon-home router-link-active" data-v-06225672></a></li> <li data-v-06225672><a href="/blog/note/typescript-axios/#《TypeScript 从零实现 axios》" data-v-06225672>《TypeScript 从零实现 axios》</a></li><li data-v-06225672><a href="/blog/note/typescript-axios/#ts-axios 接口扩展" data-v-06225672>ts-axios 接口扩展</a></li></ul> <div class="info" data-v-06225672><div title="作者" class="author iconfont icon-touxiang" data-v-06225672><a href="javascript:;" data-v-06225672>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06225672><a href="javascript:;" data-v-06225672>2020-01-05</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="data:image/png;base64,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">响应数据支持泛型<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="响应数据支持泛型"><a href="#响应数据支持泛型" class="header-anchor">#</a> 响应数据支持泛型</h1> <h2 id="需求分析"><a href="#需求分析" class="header-anchor">#</a> 需求分析</h2> <p>通常情况下，我们会把后端返回数据格式单独放入一个接口中：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token comment">// 请求接口数据</span>
<span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">ResponseData<span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span></span> <span class="token punctuation">{</span>
  <span class="token comment">/**
   * 状态码
   * @type { number }
   */</span>
  code<span class="token operator">:</span> <span class="token builtin">number</span>

  <span class="token comment">/**
   * 数据
   * @type { T }
   */</span>
  result<span class="token operator">:</span> <span class="token constant">T</span>

  <span class="token comment">/**
   * 消息
   * @type { string }
   */</span>
  message<span class="token operator">:</span> <span class="token builtin">string</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><span class="line-number">19</span><br><span class="line-number">20</span><br></div></div><p>我们可以把 API 抽离成单独的模块：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> ResponseData <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./interface.ts'</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token generic-function"><span class="token function">getUser</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> axios<span class="token punctuation">.</span><span class="token generic-function"><span class="token function">get</span><span class="token generic class-name"><span class="token operator">&lt;</span>ResponseData<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;&gt;</span></span></span><span class="token punctuation">(</span><span class="token string">'/somepath'</span><span class="token punctuation">)</span>
    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>res <span class="token operator">=&gt;</span> res<span class="token punctuation">.</span>data<span class="token punctuation">)</span>
    <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span>err <span class="token operator">=&gt;</span> <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>err<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></div></div><p>接着我们写入返回的数据类型 <code>User</code>，这可以让 TypeScript 顺利推断出我们想要的类型：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">interface</span> <span class="token class-name">User</span> <span class="token punctuation">{</span>
  name<span class="token operator">:</span> <span class="token builtin">string</span>
  age<span class="token operator">:</span> <span class="token builtin">number</span>
<span class="token punctuation">}</span>

<span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token function">test</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token comment">// user 被推断出为</span>
  <span class="token comment">// {</span>
  <span class="token comment">//  code: number,</span>
  <span class="token comment">//  result: { name: string, age: number },</span>
  <span class="token comment">//  message: string</span>
  <span class="token comment">// }</span>
  <span class="token keyword">const</span> user <span class="token operator">=</span> <span class="token keyword">await</span> <span class="token generic-function"><span class="token function">getUser</span><span class="token generic class-name"><span class="token operator">&lt;</span>User<span class="token operator">&gt;</span></span></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></div></div><h2 id="接口添加泛型参数"><a href="#接口添加泛型参数" class="header-anchor">#</a> 接口添加泛型参数</h2> <p>根据需求分析，我们需要给相关的接口定义添加泛型参数。</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">AxiosResponse<span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span></span> <span class="token punctuation">{</span>
  data<span class="token operator">:</span> <span class="token constant">T</span>
  status<span class="token operator">:</span> <span class="token builtin">number</span>
  statusText<span class="token operator">:</span> <span class="token builtin">string</span>
  headers<span class="token operator">:</span> <span class="token builtin">any</span>
  config<span class="token operator">:</span> AxiosRequestConfig
  request<span class="token operator">:</span> <span class="token builtin">any</span>
<span class="token punctuation">}</span>

<span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">AxiosPromise<span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span></span> <span class="token keyword">extends</span> <span class="token class-name"><span class="token builtin">Promise</span><span class="token operator">&lt;</span>AxiosResponse<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;&gt;</span></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">Axios</span> <span class="token punctuation">{</span>
  <span class="token generic-function"><span class="token function">request</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span></span></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 operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span>

  <span class="token generic-function"><span class="token function">get</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>url<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">,</span> config<span class="token operator">?</span><span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span>

  <span class="token keyword">delete</span><span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span><span class="token punctuation">(</span>url<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">,</span> config<span class="token operator">?</span><span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span>

  <span class="token generic-function"><span class="token function">head</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>url<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">,</span> config<span class="token operator">?</span><span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span>

  <span class="token generic-function"><span class="token function">options</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>url<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">,</span> config<span class="token operator">?</span><span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span>

  <span class="token generic-function"><span class="token function">post</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>url<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">,</span> data<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> config<span class="token operator">?</span><span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span>

  <span class="token generic-function"><span class="token function">put</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>url<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">,</span> data<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> config<span class="token operator">?</span><span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span>

  <span class="token generic-function"><span class="token function">patch</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>url<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">,</span> data<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> config<span class="token operator">?</span><span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span>
<span class="token punctuation">}</span>

<span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">AxiosInstance</span> <span class="token keyword">extends</span> <span class="token class-name">Axios</span> <span class="token punctuation">{</span>
  <span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</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 operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span><span class="token punctuation">(</span>url<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">,</span> config<span class="token operator">?</span><span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</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><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></div></div><p>这里我们先给 <code>AxiosResponse</code> 接口添加了泛型参数 <code>T</code>，<code>T=any</code> 表示泛型的类型参数默认值为 <code>any</code>。</p> <p>接着我们为 <code>AxiosPromise</code>、<code>Axios</code> 以及 <code>AxiosInstance</code> 接口都加上了泛型参数。我们可以看到这些请求的返回类型都变成了 <code>AxiosPromise&lt;T&gt;</code>，也就是 <code>Promise&lt;AxiosResponse&lt;T&gt;&gt;</code>，这样我们就可以从响应中拿到了类型 <code>T</code> 了。</p> <h2 id="demo-编写"><a href="#demo-编写" class="header-anchor">#</a> demo 编写</h2> <p><code>examples/extend/app.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">interface</span> <span class="token class-name">ResponseData<span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token operator">=</span> <span class="token builtin">any</span><span class="token operator">&gt;</span></span> <span class="token punctuation">{</span>
  code<span class="token operator">:</span> <span class="token builtin">number</span>
  result<span class="token operator">:</span> <span class="token constant">T</span>
  message<span class="token operator">:</span> <span class="token builtin">string</span>
<span class="token punctuation">}</span>

<span class="token keyword">interface</span> <span class="token class-name">User</span> <span class="token punctuation">{</span>
  name<span class="token operator">:</span> <span class="token builtin">string</span>
  age<span class="token operator">:</span> <span class="token builtin">number</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token generic-function"><span class="token function">getUser</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token generic-function"><span class="token function">axios</span><span class="token generic class-name"><span class="token operator">&lt;</span>ResponseData<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;&gt;</span></span></span><span class="token punctuation">(</span><span class="token string">'/extend/user'</span><span class="token punctuation">)</span>
    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>res <span class="token operator">=&gt;</span> res<span class="token punctuation">.</span>data<span class="token punctuation">)</span>
    <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span>err <span class="token operator">=&gt;</span> <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>


<span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token function">test</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> user <span class="token operator">=</span> <span class="token keyword">await</span> <span class="token generic-function"><span class="token function">getUser</span><span class="token generic class-name"><span class="token operator">&lt;</span>User<span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>user<span class="token punctuation">)</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>user<span class="token punctuation">.</span>result<span class="token punctuation">.</span>name<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token function">test</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><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></div></div><p>当我们调用 <code>getUser&lt;User&gt;</code> 的时候，相当于调用了 <code>axios&lt;ResponseData&lt;User&gt;&gt;</code>，也就是我们传入给 <code>axios</code> 函数的类型 <code>T</code> 为 <code>ResponseData&lt;User&gt;</code>；相当于返回值 <code>AxiosPromise&lt;T&gt;</code> 的 <code>T</code>，实际上也是 <code>Promise&lt;AxiosResponse&lt;T&gt;&gt;</code> 中的 <code>T</code> 的类型是 <code>ResponseData&lt;User&gt;</code>，所以响应数据中的 <code>data</code> 类型就是 <code>ResponseData&lt;User&gt;</code>，也就是如下数据结构：</p> <div class="language-json line-numbers-mode"><pre class="language-json"><code><span class="token punctuation">{</span>
  code<span class="token operator">:</span> number
  result<span class="token operator">:</span> User
  message<span class="token operator">:</span> string
<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></div></div><p>这个也是 <code>const user = await getUser&lt;User&gt;()</code> 返回值 <code>user</code> 的数据类型，所以 TypeScript 能正确推断出 <code>user</code> 的类型。</p> <p>至此，我们的 <code>ts-axios</code> 接口扩展章节就告一段落了，下一章我们来实现 <code>axios</code> 的一个非常好用的功能 —— 拦截器。</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》/06.ts-axios 接口扩展/03.响应数据支持泛型.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/8af227eae851ec97/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">axios 函数重载</div></a> <a href="/blog/pages/70651900f022f586/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">拦截器设计与实现</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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            <!----></div></a> <span class="date">08-11</span></dt></dl><dl><dd>02</dd> <dt><a href="/blog/pages/55f894/"><div>
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