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+---
+title: 'Document: readystatechange 事件'
+slug: Web/API/Document/readystatechange_event
+tags:
+  - Reference
+  - XMLHttpRequest
+  - interactive
+  - 事件
+translation_of: Web/API/Document/readystatechange_event
+original_slug: Web/Events/readystatechange事件
+---
+<div>{{APIRef}}</div>
+
+<p>当文档的 {{domxref("Document.readyState", "readyState")}} 属性发生改变时，会触发 <code>readystatechange</code> 事件。</p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">是否冒泡</th>
+   <td>否</td>
+  </tr>
+  <tr>
+   <th scope="row">是否可取消</th>
+   <td>否</td>
+  </tr>
+  <tr>
+   <th scope="row">接口</th>
+   <td>{{domxref("Event")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">Event handler 属性</th>
+   <td><code>onreadystatechange</code></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="实时演示">实时演示</h3>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;div class="controls"&gt;
+  &lt;button id="reload" type="button"&gt;Reload&lt;/button&gt;
+&lt;/div&gt;
+
+&lt;div class="event-log"&gt;
+  &lt;label&gt;Event log:&lt;/label&gt;
+  &lt;textarea readonly class="event-log-contents" rows="8" cols="30"&gt;&lt;/textarea&gt;
+&lt;/div&gt;</pre>
+
+<div class="hidden">
+<h4 id="CSS">CSS</h4>
+
+<pre class="brush: css">body {
+  display: grid;
+  grid-template-areas: "control  log";
+}
+
+.controls {
+  grid-area: control;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.event-log {
+  grid-area: log;
+}
+
+.event-log-contents {
+  resize: none;
+}
+
+label, button {
+  display: block;
+}
+
+#reload {
+  height: 2rem;
+}
+
+</pre>
+</div>
+
+<h4 id="JS">JS</h4>
+
+<pre class="brush: js">const log = document.querySelector('.event-log-contents');
+const reload = document.querySelector('#reload');
+
+reload.addEventListener('click', () =&gt; {
+  log.textContent ='';
+  window.setTimeout(() =&gt; {
+      window.location.reload(true);
+  }, 200);
+});
+
+window.addEventListener('load', (event) =&gt; {
+    log.textContent = log.textContent + 'load\n';
+});
+
+document.addEventListener('readystatechange', (event) =&gt; {
+    log.textContent = log.textContent + `readystate: ${document.readyState}\n`;
+});
+
+document.addEventListener('DOMContentLoaded', (event) =&gt; {
+    log.textContent = log.textContent + `DOMContentLoaded\n`;
+});
+
+</pre>
+
+<h4 id="结果">结果</h4>
+
+<p><iframe class="live-sample-frame sample-code-frame" frameborder="0" height="160px" id="frame_Live_example" src="https://mdn.mozillademos.org/en-US/docs/Web/API/Document/readystatechange_event$samples/Live_example?revision=1607037" width="100%"></iframe></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("HTML WHATWG", "indices.html#event-readystatechange", "readystatechange")}}</td>
+   <td>{{Spec2("HTML WHATWG")}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.Document.readystatechange_event")}}</p>
+
+<p>IE 浏览器是一直支持 <code>readystatechange</code> 事件的，可作为 <a href="/zh-CN/docs/Mozilla_event_reference/DOMContentLoaded_(event)">DOMContentLoaded </a>事件的替代方法（参见<a href="https://developer.mozilla.org/en-US/docs/Mozilla_event_reference/DOMContentLoaded_%28event%29#Browser_compatibility">Browser compatibility</a>的注释 [2]）。</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{event("DOMContentLoaded")}}</li>
+ <li>{{event("load")}}</li>
+ <li>{{event("beforeunload")}}</li>
+ <li>{{event("unload")}}</li>
+</ul>