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+---
+title: 'XMLHttpRequest: load event'
+slug: Web/API/XMLHttpRequest/load_event
+tags:
+  - XMLHttpRequest
+  - 接口
+translation_of: Web/API/XMLHttpRequest/load_event
+---
+<div>{{APIRef}}</div>
+
+<p>当一个{{domxref("XMLHttpRequest")}}请求完成的时候会触发<code>load</code> 事件。</p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">Bubbles</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th scope="row">Cancelable</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th scope="row">Interface</th>
+   <td>{{domxref("ProgressEvent")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">Event handler property</th>
+   <td>{{domxref("XMLHttpRequestEventTarget/onload", "onload")}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Example" name="Example">示例</h2>
+
+<h3 id="在线例子">在线例子</h3>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;div class="controls"&gt;
+    &lt;input class="xhr success" type="button" name="xhr" value="Click to start XHR (success)" /&gt;
+    &lt;input class="xhr error" type="button" name="xhr" value="Click to start XHR (error)" /&gt;
+    &lt;input class="xhr abort" type="button" name="xhr" value="Click to start XHR (abort)" /&gt;
+&lt;/div&gt;
+
+&lt;textarea readonly class="event-log"&gt;&lt;/textarea&gt;</pre>
+
+<div class="hidden">
+<h4 id="CSS">CSS</h4>
+
+<pre class="brush: css">.event-log {
+    width: 25rem;
+    height: 4rem;
+    border: 1px solid black;
+    margin: .5rem;
+    padding: .2rem;
+}
+
+input {
+    width: 11rem;
+    margin: .5rem;
+}
+</pre>
+</div>
+
+<h4 id="JS">JS</h4>
+
+<pre class="brush: js">const xhrButtonSuccess = document.querySelector('.xhr.success');
+const xhrButtonError = document.querySelector('.xhr.error');
+const xhrButtonAbort = document.querySelector('.xhr.abort');
+const log = document.querySelector('.event-log');
+
+function handleEvent(e) {
+    log.textContent = log.textContent + `${e.type}: ${e.loaded} bytes transferred\n`;
+}
+
+function addListeners(xhr) {
+    xhr.addEventListener('loadstart', handleEvent);
+    xhr.addEventListener('load', handleEvent);
+    xhr.addEventListener('loadend', handleEvent);
+    xhr.addEventListener('progress', handleEvent);
+    xhr.addEventListener('error', handleEvent);
+    xhr.addEventListener('abort', handleEvent);
+}
+
+function runXHR(url) {
+    log.textContent = '';
+
+    const xhr = new XMLHttpRequest();
+    addListeners(xhr);
+    xhr.open("GET", url);
+    xhr.send();
+    return xhr;
+}
+
+xhrButtonSuccess.addEventListener('click', () =&gt; {
+    runXHR('https://mdn.mozillademos.org/files/16553/DgsZYJNXcAIPwzy.jpg');
+});
+
+xhrButtonError.addEventListener('click', () =&gt; {
+    runXHR('https://somewhere.org/i-dont-exist');
+});
+
+xhrButtonAbort.addEventListener('click', () =&gt; {
+    runXHR('https://mdn.mozillademos.org/files/16553/DgsZYJNXcAIPwzy.jpg').abort();
+});</pre>
+
+<h4 id="结果">结果</h4>
+
+<p>{{ EmbedLiveSample('Live_example', '100%', '150px') }}</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">备注</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('XMLHttpRequest', '#event-xhr-load')}}</td>
+   <td>{{Spec2('XMLHttpRequest')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div class="hidden">此页面上的兼容性表是根据结构化数据生成的。 如果您想贡献数据，请访问<a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a>并向我们发送请求请求。</div>
+
+<p>{{Compat("api.XMLHttpRequest.load_event")}}</p>
+
+<p><font face="x-locale-heading-primary, zillaslab, Palatino, Palatino Linotype, x-locale-heading-secondary, serif"><span style="font-size: 37.33327865600586px;"><strong>了解更多</strong></span></font></p>
+
+<ul>
+ <li>相关事件: {{domxref("XMLHttpRequest/loadstart_event", "loadstart")}}, {{domxref("XMLHttpRequest/loadend_event", "loadend")}}, {{domxref("XMLHttpRequest/progress_event", "progress")}}, {{domxref("XMLHttpRequest/error_event", "error")}}, {{domxref("XMLHttpRequest/abort_event", "abort")}}</li>
+ <li><a href="/Web/API/XMLHttpRequest/Using_XMLHttpRequest#监测进度">监测进度</a></li>
+</ul>