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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: Document.visibilityState
+slug: Web/API/Document/visibilityState
+translation_of: Web/API/Document/visibilityState
+---
+<p>{{ ApiRef("DOM") }}</p>
+
+<p> <code><strong>Document.visibilityState</strong></code> (只读属性), 返回{{domxref('document')}}的可见性, 即当前可见元素的上下文环境. 由此可以知道当前文档(即为页面)是在背后, 或是不可见的隐藏的标签页,或者(正在)预渲染.可用的值如下:</p>
+
+<ul>
+ <li><code>'visible'</code> : 此时页面内容至少是部分可见. 即此页面在前景标签页中,并且窗口没有最小化.</li>
+ <li><code>'hidden</code>' : 此时页面对用户不可见. 即文档处于背景标签页或者窗口处于最小化状态,或者操作系统正处于 '锁屏状态' .</li>
+ <li><code>'prerender'</code> : 页面此时正在渲染中, 因此是不可见的 (considered hidden for purposes of <code>document.hidden</code>). 文档只能从此状态开始,永远不能从其他值变为此状态.注意: 浏览器支持是可选的.</li>
+</ul>
+
+<p>当此属性的值改变时, 会递交 {{event('visibilitychange')}} 事件给{{domxref("Document")}}.</p>
+
+<p>典型用法是防止当页面正在渲染时加载资源, 或者当页面在背景中或窗口最小化时禁止某些活动.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate">var <em>string</em> = document.visibilityState</pre>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush:js; line-numbers language-js notranslate"><code class="language-js">document.addEventListener("visibilitychange", function() {
+ console.log( document.visibilityState );
+ // Modify behavior...
+});</code></pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th>Specification</th>
+ <th>Status</th>
+ <th>Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('Page Visibility API','#dom-document-visibilitystate', 'Document.visibilityState')}}</td>
+ <td>{{Spec2('Page Visibility API')}}</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.Document.visibilityState")}}</p>