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+---
+title: GlobalEventHandlers.onscroll
+slug: Web/API/GlobalEventHandlers/onscroll
+tags:
+  - API
+  - HTML DOM
+  - 属性
+translation_of: Web/API/GlobalEventHandlers/onscroll
+---
+<div>{{ ApiRef("HTML DOM") }}</div>
+
+<p>元素的 <code>scroll </code>事件处理函数。</p>
+
+<h3 id="语法">语法</h3>
+
+<pre class="syntaxbox">element.onscroll = <var>functionReference</var></pre>
+
+<h3 id="参数">参数</h3>
+
+<p>functionReference 是一个函数的引用。当该元素滚动时，会执行该函数。</p>
+
+<div class="blockIndicator note">
+<p>注意：不要将onscroll 与 {{domxref("GlobalEventHandlers.onwheel", "onwheel")}}<font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);">混淆。</span></font>onwheel<font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);">是</span></font>鼠标滚轮旋转, 而onscroll 处理的是对象内部内容区的滚动事件。</p>
+</div>
+
+<p> </p>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: html">&lt;!DOCTYPE html&gt;
+&lt;html lang="en"&gt;
+  &lt;head&gt;
+  &lt;meta charset="UTF-8" /&gt;
+  &lt;style&gt;
+  #container {
+    position: absolute;
+    height: auto;
+    top: 0;
+    bottom: 0;
+    width: auto;
+    left: 0;
+    right: 0;
+    overflow: auto;
+  }
+
+  #foo {
+    height:1000px;
+    width:1000px;
+    background-color: #777;
+    display: block;
+  }
+
+  &lt;/style&gt;
+  &lt;/head&gt;
+  &lt;body&gt;
+    &lt;div id="container"&gt;
+      &lt;div id="foo"&gt;&lt;/div&gt;
+    &lt;/div&gt;
+
+    &lt;script type="text/javascript"&gt;
+      document.getElementById('container').onscroll = function() {
+        console.log("scrolling");
+      };
+    &lt;/script&gt;
+  &lt;/body&gt;
+&lt;/html&gt;
+</pre>
+
+<p>{{ EmbedLiveSample('示例') }}</p>
+
+<h2 id="Example">Example</h2>
+
+<p>这个示例能说明更多问题</p>
+
+<p>This example monitors scrolling on a {{HtmlElement("textarea")}}, and logs the element's vertical scroll position accordingly.</p>
+
+<h3 id="HTML">HTML</h3>
+
+<pre class="brush: html">&lt;textarea&gt;1 2 3 4 5 6 7 8 9&lt;/textarea&gt;
+&lt;p id="log"&gt;&lt;/p&gt;</pre>
+
+<h3 id="CSS">CSS</h3>
+
+<pre class="brush: css">textarea {
+  width: 4rem;
+  height: 8rem;
+  font-size: 3rem;
+}</pre>
+
+<h3 id="JavaScript">JavaScript</h3>
+
+<pre class="brush: js">const textarea = document.querySelector('textarea');
+const log = document.getElementById('log');
+
+textarea.onscroll = logScroll;
+
+function logScroll(e) {
+  log.textContent = `Scroll position: ${e.target.scrollTop}`;
+}</pre>
+
+<h3 id="Result">Result</h3>
+
+<p>{{EmbedLiveSample("Example", 700, 200)}}</p>
+<h2 id="注意">注意</h2>
+
+<p>当用户滚动某个元素的内容时 <code>scroll</code> 事件将会被触发。<code>Element.onscroll 同等于</code> <code>element.addEventListener("scroll" ... )。</code></p>
+<h2 id="规范">规范</h2>
+
+
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName("DOM3 Events", "#event-type-scroll", "onscroll")}}</td>
+   <td>{{Spec2("DOM3 Events")}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>