---
title: Screen.availHeight
slug: Web/API/Screen/availHeight
translation_of: Web/API/Screen/availHeight
---
<div>
 {{APIRef}}</div>
<h2 id="Summary" name="Summary">概述</h2>
<p>返回浏览器窗口在屏幕上可占用的垂直空间，即最大高度。</p>
<h2 id="Syntax" name="Syntax">语法</h2>
<pre class="syntaxbox"><code>iAvail = window.screen.availHeight</code></pre>
<h2 id="Example" name="Example">示例</h2>
<pre class="brush:js">if (window.screen.availHeight !== window.screen.height) {
  // something's in the way!
  // use available to size window
}</pre>
<h2 id="Specification" name="Specification">规范</h2>
<p>{{DOM0}}</p>