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+---
+title: 'Window: focus event'
+slug: Web/API/Window/focus_event
+tags:
+  - API
+  - Event
+  - Focus
+translation_of: Web/API/Window/focus_event
+---
+<div>{{APIRef}}</div>
+
+<p>当元素获得焦点时， <strong><code>focus</code></strong> 事件就会触发。</p>
+
+<p>与 <code>focus</code> 相反的事件是 {{domxref("Window/blur_event", "blur")}}</p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+  </tr>
+  <tr>
+   <th>Bubbles（支持冒泡）</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th>Cancelable（可撤销）</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th>Interface（接口）</th>
+   <td>{{DOMxRef("FocusEvent")}}</td>
+  </tr>
+  <tr>
+   <th>Event handler property（事件处理程序属性）</th>
+   <td>{{domxref("GlobalEventHandlers/onfocus", "onfocus")}}</td>
+  </tr>
+  <tr>
+   <th>Sync / Async（同步/异步）</th>
+   <td>Sync</td>
+  </tr>
+  <tr>
+   <th>Composed（可组成）</th>
+   <td>Yes</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="在线示例">在线示例</h3>
+
+<p>本示例在失去焦点时更改文档的外观。它使用 {{domxref("EventTarget.addEventListener()", "addEventListener()")}} 监听 <code>focus</code> 和 {{domxref("Window/blur_event", "blur")}} 事件。</p>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;p id="log"&gt;Click on this document to give it focus.&lt;/p&gt;</pre>
+
+<h4 id="CSS">CSS</h4>
+
+<pre class="brush: css">.paused {
+  background: #ddd;
+  color: #555;
+}</pre>
+
+<h4 id="JavaScript">JavaScript</h4>
+
+<pre class="brush: js">function pause() {
+  document.body.classList.add('paused');
+  log.textContent = 'FOCUS LOST!';
+}
+
+function play() {
+  document.body.classList.remove('paused');
+  log.textContent = 'This document has focus. Click outside the document to lose focus.';
+}
+
+const log = document.getElementById('log');
+
+window.addEventListener('blur', pause);
+window.addEventListener('focus', play);</pre>
+
+<h4 id="结果">结果</h4>
+
+<p>{{EmbedLiveSample("Live_example")}}</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("UI Events", "#event-type-focus")}}</td>
+   <td>{{Spec2("UI Events")}}</td>
+   <td>添加了组成此事件的信息。</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("DOM3 Events", "#event-type-focus")}}</td>
+   <td>{{Spec2("DOM3 Events")}}</td>
+   <td>初始定义</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格是根据结构化数据生成的。如果您想贡献数据，请查看<a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> 并向我们发送一个拉取请求。</div>
+
+<p>{{Compat("api.Window.focus_event")}}</p>
+
+<h2 id="参考">参考</h2>
+
+<ul>
+ <li>相关联事件： {{domxref("Window/blur_event", "blur")}}</li>
+ <li><code>Element</code> 目标上的这个事件: {{domxref("Element/focus_event", "focus")}} 事件</li>
+</ul>