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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>