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+---
+title: VisualViewport.offsetTop
+slug: Web/API/VisualViewport/offsetTop
+tags:
+  - API
+  - offsetTop
+translation_of: Web/API/VisualViewport/offsetTop
+---
+<p>{{SeeCompatTable}}{{APIRef("Visual Viewport")}}</p>
+
+<p>{{domxref("VisualViewport")}} 接口的只读属性 <strong><code>offsetTop</code></strong> 返回视觉视口的顶部相对于布局视口的顶部的偏移量，以CSS像素为单位。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <em>offsetTop</em> = VisualViewport.offsetTop</pre>
+
+<h3 id="值">值</h3>
+
+<p>一个双精度值。</p>
+
+<h2 id="定义">定义</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Visual Viewport','#dom-visualviewport-offsettop','offsetTop')}}</td>
+   <td>{{Spec2('Visual Viewport')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.VisualViewport.offsetTop")}}</p>