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----
-title: XMLHttpRequestEventTarget.onprogress
-slug: Web/API/XMLHttpRequestEventTarget/onprogress
-translation_of: Web/API/XMLHttpRequestEventTarget/onprogress
----
-<p>{{APIRef("XMLHttpRequest")}}</p>
-
-<p><strong><code>XMLHttpRequestEventTarget.onprogress</code></strong> 是在 {{domxref("XMLHttpRequest")}} 完成之前周期性调用的函数。</p>
-
-<h2 id="Syntax" name="Syntax">语法</h2>
-
-<pre><em>XMLHttpRequest</em>.onprogress = <em>callback</em>;</pre>
-
-<h3 id="值">值</h3>
-
-<ul>
- <li><code><em>callback</em></code> 在请求完成之前周期性调用的函数。</li>
-</ul>
-
-<h3 id="Example" name="Example">事件</h3>
-
-<ul>
- <li><em><code>event.loaded</code></em>  已传输的数据量</li>
- <li><em><code>event.total</code></em>  总共的数据量</li>
-</ul>
-
-<pre>XMLHttpRequest.onprogress = function (event) {
-  event.loaded;
-  event.total;
-};</pre>
-
-<h2 id="Example" name="Example">示例</h2>
-
-<pre>var xmlhttp = new XMLHttpRequest(),
-  method = 'GET',
-  url = 'https://developer.mozilla.org/';
-
-xmlhttp.open(<em>method</em>, <em>url</em>, true);
-xmlhttp.onprogress = function () {
-  //do something
-};
-xmlhttp.send();
-</pre>
-
-<h2 id="规范">规范</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', '#handler-xhr-onload')}}</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>
-
-<p>{{Compat("api.XMLHttpRequestEventTarget.onprogress")}}</p>