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----
-title: XMLHttpRequestEventTarget.onloadstart
-slug: Web/API/XMLHttpRequestEventTarget/onloadstart
-translation_of: Web/API/XMLHttpRequestEventTarget/onloadstart
----
-<div>{{APIRef("XMLHttpRequest")}}</div>
-
-<p><strong><code>XMLHttpRequestEventTarget.onloadstart</code></strong> 在{{domxref("XMLHttpRequest")}} 开始传送数据时被调用</p>
-
-<h2 id="Syntax" name="Syntax">语法</h2>
-
-<pre class="syntaxbox"><em>XMLHttpRequest</em>.onloadstart = <em>callback</em>;</pre>
-
-<h3 id="值">值</h3>
-
-<ul>
- <li><code><em>callback</em></code> 是开始传送数据时被调用的回调函数</li>
-</ul>
-
-<h2 id="Example" name="Example">示例</h2>
-
-<pre class="brush: js">var xmlhttp = new XMLHttpRequest(),
-  method = 'GET',
-  url = 'https://developer.mozilla.org/';
-
-xmlhttp.open(<em>method</em>, <em>url</em>, true);
-xmlhttp.onloadstart = function () {
-  console.log("Download underway");
-};
-xmlhttp.send();
-</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('XMLHttpRequest', '#handler-xhr-onloadstart')}}</td>
-   <td>{{Spec2('XMLHttpRequest')}}</td>
-   <td>WHATWG 现存标准</td>
-  </tr>
- </tbody>
-</table>
-
-<h2 id="浏览器兼容性">浏览器兼容性</h2>
-
-
-
-<p>{{Compat("api.XMLHttpRequestEventTarget.onloadstart")}}</p>