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+---
+title: Screen.orientation
+slug: Web/API/Screen/orientation
+tags:
+  - API
+  - Experimental
+  - Screen Orientation
+  - screen
+translation_of: Web/API/Screen/orientation
+---
+<p>{{APIRef("Screen Orientation API")}}{{SeeCompatTable}}</p>
+
+<p><strong><code>orientation</code></strong> 是 {{DOMxRef("Screen")}} 接口的一个只读属性，返回屏幕当前的方向。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <var>orientation</var> = window.screen.orientation;</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个 {{DOMxRef("ScreenOrientation")}} 的实例，表示屏幕的方向。</p>
+
+<p>注意在更早的、有前缀的版本中会返回一个 {{DOMxRef("DOMString")}} 值，相当于 {{DOMxRef("ScreenOrientation.type")}} 的值。</p>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js;">var orientation = (screen.orientation || {}).type || screen.mozOrientation || screen.msOrientation;
+
+if (orientation === "landscape-primary") {
+  console.log("That looks good.");
+} else if (orientation === "landscape-secondary") {
+  console.log("Mmmh... the screen is upside down!");
+} else if (orientation === "portrait-secondary" || orientation === "portrait-primary") {
+  console.log("Mmmh... you should rotate your device to landscape");
+} else if (orientation === undefined) {
+  console.log("The orientation API isn't supported in this browser :(");
+}
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">备注</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('Screen Orientation', '#dom-screen-orientation', 'orientation')}}</td>
+   <td>{{Spec2('Screen Orientation')}}</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.Screen.orientation")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{DOMxRef("ScreenOrientation")}}</li>
+ <li>{{DOMxRef("Screen.onorientationchange")}}</li>
+ <li><a href="/en-US/docs/Managing_screen_orientation">Managing screen orientation</a></li>
+</ul>