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----
-title: Body.blob()
-slug: orphaned/Web/API/Body/blob
-tags:
- - Body.blob()
-translation_of: Web/API/Body/blob
-original_slug: Web/API/Body/blob
----
-<p>{{APIRef("Fetch")}}</p>
-
-<p>{{domxref("Body")}}  mixin的 <strong><code>blob()</code></strong>方法使用一个 {{domxref("Response")}} 流,并将其读取完成。它返回一个使用{{domxref("Blob")}}解决的promise。</p>
-
-<h2 id="句法">句法</h2>
-
-<pre class="brush: js">response.blob().then(function(myBlob) {
- // do something with myBlob
-});</pre>
-
-<h3 id="参数">参数</h3>
-
-<p>None.</p>
-
-<h3 id="返回值">返回值</h3>
-
-<p>A promise that resolves with a {{domxref("Blob")}}.</p>
-
-<h2 id="例子">例子</h2>
-
-<p>在我们 <a href="https://github.com/mdn/fetch-examples/tree/gh-pages/fetch-request">fetch request example</a> (run <a href="http://mdn.github.io/fetch-examples/fetch-request/">fetch request live</a>)中,我们使用<a href="/zh-CN/docs/Mozilla/Add-ons/WebExtensions/API/webRequest/RequestFilter">Request.Request</a>构造方法创建了一个新的request对象,然后使用它来获取一个JPG文件。当fetch成功的时候,我们使用blob()从response中读取一个<a href="/zh-CN/docs/Web/API/Blob">Blob</a>对象,并使用<a href="/zh-CN/docs/Web/API/URL/createObjectURL">URL.createObjectURL</a> 将它放入一个object URL ,然后把URL设置为<a href="/zh-CN/docs/Web/HTML/Element/img">img</a>元素的src属性以显示这张图片。</p>
-
-<p> </p>
-
-<pre class="brush: js">var myImage = document.querySelector('img');
-
-var myRequest = new Request('flowers.jpg');
-
-fetch(myRequest)
-.then(function(response) {
-  return response.blob();
-})
-.then(function(myBlob) {
-  var objectURL = URL.createObjectURL(myBlob);
-  myImage.src = objectURL;
-});
-</pre>
-
-<h2 id="规范">规范</h2>
-
-<table class="standard-table">
- <tbody>
- <tr>
- <th scope="col">规范</th>
- <th scope="col">状态</th>
- <th scope="col">说明</th>
- </tr>
- <tr>
- <td>{{SpecName('Fetch','#dom-body-blob','blob()')}}</td>
- <td>{{Spec2('Fetch')}}</td>
- <td> </td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="浏览器兼容性">浏览器兼容性</h2>
-
-<p>{{ CompatibilityTable}}</p>
-
-<div id="compat-desktop">
-<table class="compat-table">
- <tbody>
- <tr>
- <th>Feature</th>
- <th>Chrome</th>
- <th>Edge</th>
- <th>Firefox (Gecko)</th>
- <th>Internet Explorer</th>
- <th>Opera</th>
- <th>Safari (WebKit)</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{ CompatChrome(42) }} [1]<br>
-  </td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{ CompatGeckoDesktop(39)}} [2]</td>
- <td>{{ CompatNo }}</td>
- <td>
- <p>29 [3]</p>
- </td>
- <td>{{ CompatNo }}</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<div id="compat-mobile">
-<table class="compat-table">
- <tbody>
- <tr>
- <th>Feature</th>
- <th>Android</th>
- <th>Edge</th>
- <th>Firefox Mobile (Gecko)</th>
- <th>Firefox OS (Gecko)</th>
- <th>IE Phone</th>
- <th>Opera Mobile</th>
- <th>Safari Mobile</th>
- <th>Chrome for Android</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{ CompatNo }}</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{ CompatNo }}</td>
- <td>{{ CompatNo }}</td>
- <td>{{ CompatNo }}</td>
- <td>{{ CompatNo }}</td>
- <td>{{ CompatNo }}</td>
- <td>{{ CompatNo }}</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<p>[1] Behind a preference in version 41.</p>
-
-<p>[2] Behind a preference starting with version 34.</p>
-
-<p>[3] Behind a preference in version 28.</p>
-
-<h2 id="另见">另见</h2>
-
-<ul>
- <li><a href="/en-US/docs/Web/API/ServiceWorker_API">ServiceWorker API</a></li>
- <li><a href="/en-US/docs/Web/HTTP/Access_control_CORS">HTTP access control (CORS)</a></li>
- <li><a href="/en-US/docs/Web/HTTP">HTTP</a></li>
-</ul>