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    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>初识 TypeScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TypeScript 常用语法</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 项目初始化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 基础功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>ts-axios 异常情况处理</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/blog/pages/6a8bef7b98dfdcf9/" aria-current="page" class="active sidebar-link">错误处理</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/6a8bef7b98dfdcf9/#需求分析" class="sidebar-link">需求分析</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/6a8bef7b98dfdcf9/#处理网络异常错误" class="sidebar-link">处理网络异常错误</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/6a8bef7b98dfdcf9/#处理超时错误" class="sidebar-link">处理超时错误</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/6a8bef7b98dfdcf9/#处理非-200-状态码" class="sidebar-link">处理非 200 状态码</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/6a8bef7b98dfdcf9/#demo-编写" class="sidebar-link">demo 编写</a></li></ul></li><li><a href="/blog/pages/22d581d8c2860b8a/" class="sidebar-link">错误信息增强</a></li></ul></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-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 异常情况处理" data-v-06970110>ts-axios 异常情况处理</a></li></ul> <div class="info" data-v-06970110><div title="作者" class="author iconfont icon-touxiang" data-v-06970110><a href="javascript:;" data-v-06970110>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06970110><a href="javascript:;" data-v-06970110>2020-01-05</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="data:image/png;base64,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">错误处理<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="错误处理"><a href="#错误处理" class="header-anchor">#</a> 错误处理</h1> <h2 id="需求分析"><a href="#需求分析" class="header-anchor">#</a> 需求分析</h2> <p>在上一章节，我们实现了 <code>ts-axios</code> 的基础功能，但目前为止我们都是处理了正常接收请求的逻辑，并没有考虑到任何错误情况的处理，这对于一个程序的健壮性而言是远不够的，因此我们这一章需要对 AJAX 各种错误情况做处理。</p> <p>并且我们希望程序也能捕获到这些错误，做进一步的处理。</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>
  method<span class="token operator">:</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
  url<span class="token operator">:</span> <span class="token string">'/error/get'</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>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<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>e<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></div></div><p>如果在请求的过程中发生任何错误，我们都可以在 <code>reject</code> 回调函数中捕获到。</p> <p>我们把错误分成了几类，接下来我们就来分别处理这些错误情况。</p> <h2 id="处理网络异常错误"><a href="#处理网络异常错误" class="header-anchor">#</a> 处理网络异常错误</h2> <p>当网络出现异常（比如不通）的时候发送请求会触发 <code>XMLHttpRequest</code> 对象实例的 <code>error</code> 事件，于是我们可以在 <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequestEventTarget/onerror" target="_blank" rel="noopener noreferrer"><code>onerror</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> 的事件回调函数中捕获此类错误。</p> <p>我们在 <code>xhr</code> 函数中添加如下代码：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>request<span class="token punctuation">.</span><span class="token function-variable function">onerror</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token function">handleError</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token function">reject</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token string">'Network Error'</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></div></div><h2 id="处理超时错误"><a href="#处理超时错误" class="header-anchor">#</a> 处理超时错误</h2> <p>我们可以设置某个请求的超时时间 <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/timeout" target="_blank" rel="noopener noreferrer"><code>timeout</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>，也就是当请求发送后超过某个时间后仍然没收到响应，则请求自动终止，并触发 <code>timeout</code> 事件。</p> <p>请求默认的超时时间是 0，即永不超时。所以我们首先需要允许程序可以配置超时时间：</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>
  timeout<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">number</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></div></div><p>接着在 <code>xhr</code> 函数中添加如下代码：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">const</span> <span class="token punctuation">{</span> <span class="token comment">/*...*/</span> timeout <span class="token punctuation">}</span> <span class="token operator">=</span> config

<span class="token keyword">if</span> <span class="token punctuation">(</span>timeout<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  request<span class="token punctuation">.</span>timeout <span class="token operator">=</span> timeout
<span class="token punctuation">}</span>

request<span class="token punctuation">.</span><span class="token function-variable function">ontimeout</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token function">handleTimeout</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token function">reject</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Timeout of </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>timeout<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"> ms exceeded</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><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></div></div><h2 id="处理非-200-状态码"><a href="#处理非-200-状态码" class="header-anchor">#</a> 处理非 200 状态码</h2> <p>对于一个正常的请求，往往会返回 200-300 之间的 HTTP 状态码，对于不在这个区间的状态码，我们也把它们认为是一种错误的情况做处理。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>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>
  <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>
    <span class="token keyword">return</span>
  <span class="token punctuation">}</span>

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

  <span class="token keyword">const</span> responseHeaders <span class="token operator">=</span> <span class="token function">parseHeaders</span><span class="token punctuation">(</span>request<span class="token punctuation">.</span><span class="token function">getAllResponseHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
  <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
  <span class="token keyword">const</span> response<span class="token operator">:</span> AxiosResponse <span class="token operator">=</span> <span class="token punctuation">{</span>
    data<span class="token operator">:</span> responseData<span class="token punctuation">,</span>
    status<span class="token operator">:</span> request<span class="token punctuation">.</span>status<span class="token punctuation">,</span>
    statusText<span class="token operator">:</span> request<span class="token punctuation">.</span>statusText<span class="token punctuation">,</span>
    headers<span class="token operator">:</span> responseHeaders<span class="token punctuation">,</span>
    config<span class="token punctuation">,</span>
    request
  <span class="token punctuation">}</span>
  <span class="token function">handleResponse</span><span class="token punctuation">(</span>response<span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">handleResponse</span><span class="token punctuation">(</span>response<span class="token operator">:</span> AxiosResponse<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>response<span class="token punctuation">.</span>status <span class="token operator">&gt;=</span> <span class="token number">200</span> <span class="token operator">&amp;&amp;</span> response<span class="token punctuation">.</span>status <span class="token operator">&lt;</span> <span class="token number">300</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">resolve</span><span class="token punctuation">(</span>response<span class="token punctuation">)</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    <span class="token function">reject</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Request failed with status code </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>response<span class="token punctuation">.</span>status<span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><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><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></div></div><p>我们在 <code>onreadystatechange</code> 的回调函数中，添加了对 <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/status" target="_blank" rel="noopener noreferrer"><code>request.status</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> 的判断，因为当出现网络错误或者超时错误的时候，该值都为 0。</p> <p>接着我们在 <code>handleResponse</code> 函数中对 <code>request.status</code> 的值再次判断，如果是 <code>2xx</code> 的状态码，则认为是一个正常的请求，否则抛错。</p> <h2 id="demo-编写"><a href="#demo-编写" class="header-anchor">#</a> demo 编写</h2> <p>在 <code>examples</code> 目录下创建 <code>error</code> 目录，在 <code>error</code> 目录下创建 <code>index.html</code>:</p> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>utf-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Error example<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>/__build__/error.js<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script"></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></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></div></div><p>接着创建 <code>app.ts</code> 作为入口文件：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> axios <span class="token keyword">from</span> <span class="token string">'../../src/index'</span>

<span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  method<span class="token operator">:</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
  url<span class="token operator">:</span> <span class="token string">'/error/get1'</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>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<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>e<span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  method<span class="token operator">:</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
  url<span class="token operator">:</span> <span class="token string">'/error/get'</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>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<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>e<span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    method<span class="token operator">:</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
    url<span class="token operator">:</span> <span class="token string">'/error/get'</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>
  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<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>e<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> <span class="token number">5000</span><span class="token punctuation">)</span>

<span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  method<span class="token operator">:</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
  url<span class="token operator">:</span> <span class="token string">'/error/timeout'</span><span class="token punctuation">,</span>
  timeout<span class="token operator">:</span> <span class="token number">2000</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>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<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>e<span class="token punctuation">.</span>message<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><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></div></div><p>接着在 <code>server.js</code> 添加新的接口路由：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>router<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/error/get'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span>req<span class="token punctuation">,</span> res<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&gt;</span> <span class="token number">0.5</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    res<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
      msg<span class="token operator">:</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">hello world</span><span class="token template-punctuation string">`</span></span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    res<span class="token punctuation">.</span><span class="token function">status</span><span class="token punctuation">(</span><span class="token number">500</span><span class="token punctuation">)</span>
    res<span class="token punctuation">.</span><span class="token function">end</span><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>

router<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/error/timeout'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span>req<span class="token punctuation">,</span> res<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    res<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
      msg<span class="token operator">:</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">hello world</span><span class="token template-punctuation string">`</span></span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">3000</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>然后在命令行运行 <code>npm run dev</code>，接着打开 chrome 浏览器，访问 <code>http://localhost:8080/</code> 即可访问我们的 demo 了，我们点到 <code>Error</code> 目录下，通过开发者工具的 network 部分我们可以看到不同的错误情况。</p> <p>至此我们对各种错误都做了处理，并把它们抛给了程序应用方，让他们对错误可以做进一步的处理。但是这里我们的错误都仅仅是简单的 Error 实例，只有错误文本信息，并不包含是哪个请求、请求的配置、响应对象等其它信息。那么下一节课，我们会对错误信息做增强。</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》/05.ts-axios 异常情况处理/01.错误处理.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/922cb4268499dc3f/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">处理响应 data</div></a> <a href="/blog/pages/22d581d8c2860b8a/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">错误信息增强</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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