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+---
+title: XMLHttpRequest.upload
+slug: Web/API/XMLHttpRequest/upload
+translation_of: Web/API/XMLHttpRequest/upload
+---
+<p>{{APIRef('XMLHttpRequest')}}</p>
+
+<p><strong>XMLHttpRequest.upload 属性返回一个</strong> {{domxref("XMLHttpRequestUpload")}}对象，用来表示上传的进度。这个对象是不透明的，但是作为一个{{domxref("XMLHttpRequestEventTarget")}}，可以通过对其绑定事件来追踪它的进度。</p>
+
+<p>可以被绑定在upload对象上的事件监听器如下：</p>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <td class="header">事件</td>
+   <td class="header">相应属性的信息类型</td>
+  </tr>
+  <tr>
+   <td><code>onloadstart</code></td>
+   <td>获取开始</td>
+  </tr>
+  <tr>
+   <td><code>onprogress</code></td>
+   <td>数据传输进行中</td>
+  </tr>
+  <tr>
+   <td><code>onabort</code></td>
+   <td>获取操作终止</td>
+  </tr>
+  <tr>
+   <td><code>onerror</code></td>
+   <td>获取失败</td>
+  </tr>
+  <tr>
+   <td><code>onload</code></td>
+   <td>获取成功</td>
+  </tr>
+  <tr>
+   <td><code>ontimeout</code></td>
+   <td>获取操作在用户规定的时间内未完成</td>
+  </tr>
+  <tr>
+   <td><code>onloadend</code></td>
+   <td>获取完成（不论成功与否）</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="说明">说明</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('XMLHttpRequest', '#the-upload-attribute')}}</td>
+   <td>{{Spec2('XMLHttpRequest')}}</td>
+   <td>WHATWG living standard</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>