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+---
+title: 'Document: scroll event'
+slug: Web/API/Document/scroll_event
+tags:
+  - API
+  - DOM
+  - Event
+  - Reference
+  - Scroll
+  - requestAnimationFram
+  - 事件
+  - 参考
+  - 滚动
+translation_of: Web/API/Document/scroll_event
+---
+<p>文档视图或者一个元素在滚动时，会触发元素的<strong><code>scroll</code></strong>事件。</p>
+
+<table class="properties">
+ <thead>
+ </thead>
+ <tbody>
+  <tr>
+   <th>Bubbles</th>
+   <td>Yes</td>
+  </tr>
+  <tr>
+   <th>Cancelable</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th>Interface</th>
+   <td>{{DOMxRef("Event")}}</td>
+  </tr>
+  <tr>
+   <th>Event handler property</th>
+   <td>{{DOMxRef("GlobalEventHandlers.onscroll", "onscroll")}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<div class="blockIndicator note">
+<p><strong>注意：</strong>在 iOS UIWebViews中， 滚动进行时不会触发 <code>scroll</code> 事件；只有当滚动结束后事件才会被触发。参见 <a href="https://github.com/twbs/bootstrap/issues/16202">Bootstrap issue #16202</a>。Safari 和 WKWebViews 则没有这个问题。</p>
+</div>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="Scroll_事件节流">Scroll 事件节流</h3>
+
+<p>由于 <code>scroll</code> 事件可被高频触发，事件处理程序不应该执行高性能消耗的操作，如DOM操作。而更推荐的做法是使用 {{DOMxRef("Window.requestAnimationFrame()", "requestAnimationFrame()")}}, {{DOMxRef("WindowOrWorkerGlobalScope.setTimeout()", "setTimeout()")}} 或 {{DOMxRef("CustomEvent")}} 给事件节流，如下所述。</p>
+
+<p>然而需要注意的是，输入事件和动画帧常常以差不多的频率被触发，因此以下优化常常不必要。这个例子使用 <code>requestAnimationFrame</code> 优化 <code>scroll</code> 事件。</p>
+
+<pre class="brush: js">// 参见: http://www.html5rocks.com/en/tutorials/speed/animations/
+
+let last_known_scroll_position = 0;
+let ticking = false;
+
+function doSomething(scroll_pos) {
+  // 根据滚动位置做的事
+}
+
+window.addEventListener('scroll', function(e) {
+  last_known_scroll_position = window.scrollY;
+
+  if (!ticking) {
+    window.requestAnimationFrame(function() {
+      doSomething(last_known_scroll_position);
+      ticking = false;
+    });
+
+    ticking = true;
+  }
+});</pre>
+
+<p>在 <code><a href="/en-US/docs/Web/API/Document/defaultView/resize_event">resize</a></code> 事件页面中查看更多类似的例子。</p>
+
+<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>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM3 Events', '#event-type-scroll')}}</td>
+   <td>{{Spec2('DOM3 Events')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>{{Compat("api.Document.scroll_event")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/API/Element/scroll_event">Element: <code>scroll</code> event</a></li>
+</ul>