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  19.   <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></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="前端" class="dropdown-title"><a href="/blog/web/" class="link-title">前端</a> <span class="title" style="display:none;">前端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>前端文章</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/pages/8143cc480faf9a11/" class="nav-link">JavaScript</a></li></ul></li><li class="dropdown-item"><h4>学习笔记</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/note/javascript/" class="nav-link">《JavaScript教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/js/" class="nav-link">《JavaScript高级程序设计》</a></li><li class="dropdown-subitem"><a href="/blog/note/es6/" class="nav-link">《ES6 教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/vue/" class="nav-link">《Vue》</a></li><li class="dropdown-subitem"><a href="/blog/note/react/" class="nav-link">《React》</a></li><li class="dropdown-subitem"><a href="/blog/note/typescript-axios/" class="nav-link">《TypeScript 从零实现 axios》</a></li><li class="dropdown-subitem"><a href="/blog/note/git/" class="nav-link">《Git》</a></li><li class="dropdown-subitem"><a href="/blog/pages/51afd6/" class="nav-link">TypeScript</a></li><li class="dropdown-subitem"><a href="/blog/pages/4643cd/" class="nav-link">JS设计模式总结</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="页面" class="dropdown-title"><a href="/blog/ui/" class="link-title">页面</a> <span class="title" style="display:none;">页面</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/8309a5b876fc95e3/" class="nav-link">HTML</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/0a83b083bdf257cb/" class="nav-link">CSS</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="技术" class="dropdown-title"><a href="/blog/technology/" class="link-title">技术</a> <span class="title" style="display:none;">技术</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/9a7ee40fc232253e/" class="nav-link">技术文档</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/4c778760be26d8b3/" class="nav-link">GitHub技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/117708e0af7f0bd9/" class="nav-link">Nodejs</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/41f87d890d0a02af/" class="nav-link">博客搭建</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="更多" class="dropdown-title"><a href="/blog/more/" class="link-title">更多</a> <span class="title" style="display:none;">更多</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/f2a556/" class="nav-link">学习</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/aea6571b7a8bae86/" class="nav-link">面试</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/2d615df9a36a98ed/" class="nav-link">心情杂货</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/baaa02/" class="nav-link">实用技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/friends/" class="nav-link">友情链接</a></li></ul></div></div><div class="nav-item"><a href="/blog/about/" class="nav-link">关于</a></div><div class="nav-item"><a href="/blog/pages/beb6c0bd8a66cea6/" class="nav-link">收藏</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="索引" class="dropdown-title"><a href="/blog/archives/" class="link-title">索引</a> <span class="title" style="display:none;">索引</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/categories/" class="nav-link">分类</a></li><li class="dropdown-item"><!----> <a href="/blog/tags/" class="nav-link">标签</a></li><li class="dropdown-item"><!----> <a href="/blog/archives/" class="nav-link">归档</a></li></ul></div></div> <a href="https://github.com/heBody/blog" target="_blank" rel="noopener noreferrer" class="repo-link">
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  23.   <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></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="前端" class="dropdown-title"><a href="/blog/web/" class="link-title">前端</a> <span class="title" style="display:none;">前端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>前端文章</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/pages/8143cc480faf9a11/" class="nav-link">JavaScript</a></li></ul></li><li class="dropdown-item"><h4>学习笔记</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/note/javascript/" class="nav-link">《JavaScript教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/js/" class="nav-link">《JavaScript高级程序设计》</a></li><li class="dropdown-subitem"><a href="/blog/note/es6/" class="nav-link">《ES6 教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/vue/" class="nav-link">《Vue》</a></li><li class="dropdown-subitem"><a href="/blog/note/react/" class="nav-link">《React》</a></li><li class="dropdown-subitem"><a href="/blog/note/typescript-axios/" class="nav-link">《TypeScript 从零实现 axios》</a></li><li class="dropdown-subitem"><a href="/blog/note/git/" class="nav-link">《Git》</a></li><li class="dropdown-subitem"><a href="/blog/pages/51afd6/" class="nav-link">TypeScript</a></li><li class="dropdown-subitem"><a href="/blog/pages/4643cd/" class="nav-link">JS设计模式总结</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="页面" class="dropdown-title"><a href="/blog/ui/" class="link-title">页面</a> <span class="title" style="display:none;">页面</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/8309a5b876fc95e3/" class="nav-link">HTML</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/0a83b083bdf257cb/" class="nav-link">CSS</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="技术" class="dropdown-title"><a href="/blog/technology/" class="link-title">技术</a> <span class="title" style="display:none;">技术</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/9a7ee40fc232253e/" class="nav-link">技术文档</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/4c778760be26d8b3/" class="nav-link">GitHub技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/117708e0af7f0bd9/" class="nav-link">Nodejs</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/41f87d890d0a02af/" class="nav-link">博客搭建</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="更多" class="dropdown-title"><a href="/blog/more/" class="link-title">更多</a> <span class="title" style="display:none;">更多</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/f2a556/" class="nav-link">学习</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/aea6571b7a8bae86/" class="nav-link">面试</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/2d615df9a36a98ed/" class="nav-link">心情杂货</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/baaa02/" class="nav-link">实用技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/friends/" class="nav-link">友情链接</a></li></ul></div></div><div class="nav-item"><a href="/blog/about/" class="nav-link">关于</a></div><div class="nav-item"><a href="/blog/pages/beb6c0bd8a66cea6/" class="nav-link">收藏</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="索引" class="dropdown-title"><a href="/blog/archives/" class="link-title">索引</a> <span class="title" style="display:none;">索引</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/categories/" class="nav-link">分类</a></li><li class="dropdown-item"><!----> <a href="/blog/tags/" class="nav-link">标签</a></li><li class="dropdown-item"><!----> <a href="/blog/archives/" class="nav-link">归档</a></li></ul></div></div> <a href="https://github.com/heBody/blog" target="_blank" rel="noopener noreferrer" class="repo-link">
    24. 

  24.     GitHub
    25. 

  25.     <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>初识 TypeScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TypeScript 常用语法</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 项目初始化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>ts-axios 基础功能实现</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/blog/pages/1313dae575f6dddf/" class="sidebar-link">处理请求 url 参数</a></li><li><a href="/blog/pages/887cd0918e2543d8/" class="sidebar-link">处理请求 body 数据</a></li><li><a href="/blog/pages/35c0ec1bb0b0faaf/" class="sidebar-link">处理请求 header</a></li><li><a href="/blog/pages/a57debe141e1e4f4/" aria-current="page" class="active sidebar-link">获取响应数据</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/a57debe141e1e4f4/#需求分析" class="sidebar-link">需求分析</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/a57debe141e1e4f4/#定义接口类型" class="sidebar-link">定义接口类型</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/a57debe141e1e4f4/#实现获取响应数据逻辑" class="sidebar-link">实现获取响应数据逻辑</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/a57debe141e1e4f4/#demo-编写" class="sidebar-link">demo 编写</a></li></ul></li><li><a href="/blog/pages/927161662ca32c24/" class="sidebar-link">处理响应 header</a></li><li><a href="/blog/pages/922cb4268499dc3f/" class="sidebar-link">处理响应 data</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 异常情况处理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 接口扩展</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 拦截器实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 配置化实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 取消功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><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 基础功能实现" data-v-06225672>ts-axios 基础功能实现</a></li></ul> <div class="info" data-v-06225672><div title="作者" class="author iconfont icon-touxiang" data-v-06225672><a href="javascript:;" data-v-06225672>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06225672><a href="javascript:;" data-v-06225672>2020-01-05</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="data:image/png;base64,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">获取响应数据<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="获取响应数据"><a href="#获取响应数据" class="header-anchor">#</a> 获取响应数据</h1> <h2 id="需求分析"><a href="#需求分析" class="header-anchor">#</a> 需求分析</h2> <p>在前面的章节中，我们发送的请求都可以从网络层面接收到服务端返回的数据，但是代码层面并没有做任何关于返回数据的处理。我们希望能处理服务端响应的数据，并支持 Promise 链式调用的方式，如下：</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>
    26. 

  26.   method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
    27. 

  27.   url<span class="token operator">:</span> <span class="token string">'/base/post'</span><span class="token punctuation">,</span>
    28. 

  28.   data<span class="token operator">:</span> <span class="token punctuation">{</span>
    29. 

  29.     a<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    30. 

  30.     b<span class="token operator">:</span> <span class="token number">2</span>
    31. 

  31.   <span class="token punctuation">}</span>
    32. 

  32. <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>
    33. 

  33.   <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>
    34. 

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

  35. </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>我们可以拿到 <code>res</code> 对象，并且我们希望该对象包括：服务端返回的数据 <code>data</code>，HTTP 状态码<code>status</code>，状态消息 <code>statusText</code>，响应头 <code>headers</code>、请求配置对象 <code>config</code> 以及请求的 <code>XMLHttpRequest</code> 对象实例 <code>request</code>。</p> <h2 id="定义接口类型"><a href="#定义接口类型" class="header-anchor">#</a> 定义接口类型</h2> <p>根据需求，我们可以定义一个 <code>AxiosResponse</code> 接口类型，如下：</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> <span class="token punctuation">{</span>
    36. 

  36.   data<span class="token operator">:</span> <span class="token builtin">any</span>
    37. 

  37.   status<span class="token operator">:</span> <span class="token builtin">number</span>
    38. 

  38.   statusText<span class="token operator">:</span> <span class="token builtin">string</span>
    39. 

  39.   headers<span class="token operator">:</span> <span class="token builtin">any</span>
    40. 

  40.   config<span class="token operator">:</span> AxiosRequestConfig
    41. 

  41.   request<span class="token operator">:</span> <span class="token builtin">any</span>
    42. 

  42. <span class="token punctuation">}</span>
    43. 

  43. </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>另外，<code>axios</code> 函数返回的是一个 <code>Promise</code> 对象，我们可以定义一个 <code>AxiosPromise</code> 接口，它继承于 <code>Promise&lt;AxiosResponse&gt;</code> 这个泛型接口：</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">AxiosPromise</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">&gt;</span></span> <span class="token punctuation">{</span>
    44. 

  44. <span class="token punctuation">}</span>
    45. 

  45. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>这样的话，当 <code>axios</code> 返回的是 <code>AxiosPromise</code> 类型，那么 <code>resolve</code> 函数中的参数就是一个 <code>AxiosResponse</code> 类型。</p> <p>对于一个 AJAX 请求的 <code>response</code>，我们是可以指定它的响应的数据类型的，通过设置 <code>XMLHttpRequest</code> 对象的 <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/responseType" target="_blank" rel="noopener noreferrer"><code>responseType</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 属性，于是我们可以给 <code>AxiosRequestConfig</code> 类型添加一个可选属性：</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>
    46. 

  46.   <span class="token comment">// ...</span>
    47. 

  47.   responseType<span class="token operator">?</span><span class="token operator">:</span> XMLHttpRequestResponseType
    48. 

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

  49. </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><code>responseType</code> 的类型是一个 <code>XMLHttpRequestResponseType</code> 类型，它的定义是 <code>&quot;&quot; | &quot;arraybuffer&quot; | &quot;blob&quot; | &quot;document&quot; | &quot;json&quot; | &quot;text&quot;</code> 字符串字面量类型。</p> <h2 id="实现获取响应数据逻辑"><a href="#实现获取响应数据逻辑" class="header-anchor">#</a> 实现获取响应数据逻辑</h2> <p>首先我们要在 <code>xhr</code> 函数添加 <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/onreadystatechange" target="_blank" rel="noopener noreferrer"><code>onreadystatechange</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 事件处理函数，并且让 <code>xhr</code> 函数返回的是 <code>AxiosPromise</code> 类型。</p> <p><code>xhr.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">function</span> <span class="token function">xhr</span><span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise <span class="token punctuation">{</span>
    50. 

  50.   <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name"><span class="token builtin">Promise</span></span><span class="token punctuation">(</span><span class="token punctuation">(</span>resolve<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    51. 

  51.     <span class="token keyword">const</span> <span class="token punctuation">{</span> data <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">,</span> url<span class="token punctuation">,</span> method <span class="token operator">=</span> <span class="token string">'get'</span><span class="token punctuation">,</span> headers<span class="token punctuation">,</span> responseType <span class="token punctuation">}</span> <span class="token operator">=</span> config
    52. 

  52. 

  53.     <span class="token keyword">const</span> request <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLHttpRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    54. 

  54. 

  55.     <span class="token keyword">if</span> <span class="token punctuation">(</span>responseType<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    56. 

  56.       request<span class="token punctuation">.</span>responseType <span class="token operator">=</span> responseType
    57. 

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

  58. 

  59.     request<span class="token punctuation">.</span><span class="token function">open</span><span class="token punctuation">(</span>method<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> url<span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
    60. 

  60. 

  61.     request<span class="token punctuation">.</span><span class="token function-variable function">onreadystatechange</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token function">handleLoad</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    62. 

  62.       <span class="token keyword">if</span> <span class="token punctuation">(</span>request<span class="token punctuation">.</span>readyState <span class="token operator">!==</span> <span class="token number">4</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    63. 

  63.         <span class="token keyword">return</span>
    64. 

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

  65. 

  66.       <span class="token keyword">const</span> responseHeaders <span class="token operator">=</span> request<span class="token punctuation">.</span><span class="token function">getAllResponseHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    67. 

  67.       <span class="token keyword">const</span> responseData <span class="token operator">=</span> responseType <span class="token operator">&amp;&amp;</span> responseType <span class="token operator">!==</span> <span class="token string">'text'</span> <span class="token operator">?</span> request<span class="token punctuation">.</span>response <span class="token operator">:</span> request<span class="token punctuation">.</span>responseText
    68. 

  68.       <span class="token keyword">const</span> response<span class="token operator">:</span> AxiosResponse <span class="token operator">=</span> <span class="token punctuation">{</span>
    69. 

  69.         data<span class="token operator">:</span> responseData<span class="token punctuation">,</span>
    70. 

  70.         status<span class="token operator">:</span> request<span class="token punctuation">.</span>status<span class="token punctuation">,</span>
    71. 

  71.         statusText<span class="token operator">:</span> request<span class="token punctuation">.</span>statusText<span class="token punctuation">,</span>
    72. 

  72.         headers<span class="token operator">:</span> responseHeaders<span class="token punctuation">,</span>
    73. 

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

  74.         request
    75. 

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

  76.       <span class="token function">resolve</span><span class="token punctuation">(</span>response<span class="token punctuation">)</span>
    77. 

  77.     <span class="token punctuation">}</span>
    78. 

  78. 

  79.     Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span>name<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    80. 

  80.       <span class="token keyword">if</span> <span class="token punctuation">(</span>data <span class="token operator">===</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> name<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">===</span> <span class="token string">'content-type'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    81. 

  81.         <span class="token keyword">delete</span> headers<span class="token punctuation">[</span>name<span class="token punctuation">]</span>
    82. 

  82.       <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    83. 

  83.         request<span class="token punctuation">.</span><span class="token function">setRequestHeader</span><span class="token punctuation">(</span>name<span class="token punctuation">,</span> headers<span class="token punctuation">[</span>name<span class="token punctuation">]</span><span class="token punctuation">)</span>
    84. 

  84.       <span class="token punctuation">}</span>
    85. 

  85.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    86. 

  86. 

  87.     request<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span>
    88. 

  88.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    89. 

  89. <span class="token punctuation">}</span>
    90. 

  90. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br></div></div><p>注意，我们这里还判断了如果 <code>config</code> 中配置了 <code>responseType</code>，我们把它设置到 <code>request.responseType</code> 中。在 <code>onreadystatechange</code> 事件函数中，我们构造了 <code>AxiosResponse</code> 类型的 <code>reponse</code> 对象，并把它 <code>resolve</code> 出去。</p> <p>修改了 <code>xhr</code> 函数，我们同样也要对应修改 <code>axios</code> 函数：</p> <p><code>index.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">axios</span><span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise <span class="token punctuation">{</span>
    91. 

  91.   <span class="token function">processConfig</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    92. 

  92.   <span class="token keyword">return</span> <span class="token function">xhr</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    93. 

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

  94. </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>这样我们就实现了 <code>axios</code> 函数的 Promise 化。</p> <h2 id="demo-编写"><a href="#demo-编写" class="header-anchor">#</a> demo 编写</h2> <p>我们在 <code>examples/base/app.ts</code> 文件中添加 2 段代码：</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>
    95. 

  95.   method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
    96. 

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

  97.   data<span class="token operator">:</span> <span class="token punctuation">{</span>
    98. 

  98.     a<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    99. 

  99.     b<span class="token operator">:</span> <span class="token number">2</span>
    100. 

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

  101. <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>
    102. 

  102.   <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>
    103. 

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

  104. 

  105. <span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    106. 

  106.   method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
    107. 

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

  108.   responseType<span class="token operator">:</span> <span class="token string">'json'</span><span class="token punctuation">,</span>
    109. 

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

  110.     a<span class="token operator">:</span> <span class="token number">3</span><span class="token punctuation">,</span>
    111. 

  111.     b<span class="token operator">:</span> <span class="token number">4</span>
    112. 

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

  113. <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>
    114. 

  114.   <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>
    115. 

  115. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    116. 

  116. </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>我们打开浏览器运行 demo，看一下结果，发现我们可以正常 log 出这个 <code>res</code> 变量，它包含 <code>AxiosResponse</code> 类型中定义的那些属性，不过我们发现 2 个小问题：第一个是 <code>headers</code> 属性是一个字符串，我们需要把它解析成对象类型；第二个是在第一个请求中，得到的数据是一个 JSON 字符串，我们也需要把它转换成对象类型。</p> <p>那么下一小节，我们将来解决第一个问题，对于响应的 <code>header</code> 做处理。</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》/04.ts-axios 基础功能实现/04.获取响应数据.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/35c0ec1bb0b0faaf/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">处理请求 header</div></a> <a href="/blog/pages/927161662ca32c24/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">处理响应 header</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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  117.         ←
    118. 

  118.         <a href="/blog/pages/35c0ec1bb0b0faaf/" class="prev">处理请求 header</a></span> <span class="next"><a href="/blog/pages/927161662ca32c24/">处理响应 header</a>→
    119. 

  119.       </span></p></div></div></div> <div class="article-list"><div class="article-title"><a href="/blog/archives/" class="iconfont icon-bi">最近更新</a></div> <div class="article-wrapper"><dl><dd>01</dd> <dt><a href="/blog/pages/922650/"><div>
    120. 

  120.             Git修改分支名
    121. 

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  122.             CSS给table的tbody添加滚动条
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