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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: Screen.orientation
+slug: Web/API/Screen/orientation
+tags:
+ - API
+ - CSSOM View
+ - Experimental
+ - Orientation
+ - Property
+ - Read-only
+ - Screen Orientation
+ - screen
+translation_of: Web/API/Screen/orientation
+---
+<div>{{APIRef("Screen Orientation API")}}{{SeeCompatTable}}</div>
+
+<p><strong><code>orientation</code></strong> は {{DOMxRef("Screen")}} インターフェイスの読み取り専用プロパティで、現在の画面の向きを返します。</p>
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox">var <var>orientation</var> = window.screen.orientation;</pre>
+
+<h3 id="Return_value" name="Return_value">返値</h3>
+
+<p>画面の向きを表す {{DOMxRef("ScreenOrientation")}} のインスタンスです。</p>
+
+<p>なお、古い接頭辞付きのものは {{DOMxRef("DOMString")}} で {{DOMxRef("ScreenOrientation.type")}} と同等のものを返していました。</p>
+
+<h2 id="Example" name="Example">例</h2>
+
+<pre class="brush: js">var orientation = screen.msOrientation || screen.mozOrientation || (screen.orientation || {}).type;
+
+if (orientation === "landscape-primary") {
+ console.log("良い感じですね。");
+} else if (orientation === "landscape-secondary") {
+ console.log("うーん…。画面が上下逆です!");
+} else if (orientation === "portrait-secondary" || orientation === "portrait-primary") {
+ console.log("うーん…。スクリーンを横向きにした方がいいですよ");
+} else if (orientation === undefined) {
+ console.log("このブラウザーは orientation API に対応していません :(");
+}
+</pre>
+
+<h2 id="Specifications" name="Specifications">仕様書</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">仕様書</th>
+ <th scope="col">状態</th>
+ <th scope="col">備考</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName('Screen Orientation', '#dom-screen-orientation', 'orientation')}}</td>
+ <td>{{Spec2('Screen Orientation')}}</td>
+ <td>初回定義</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの対応</h2>
+
+<p>{{Compat("api.Screen.orientation")}}</p>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>{{DOMxRef("ScreenOrientation")}}</li>
+ <li>{{DOMxRef("Screen.onorientationchange")}}</li>
+ <li><a href="/ja/docs/Managing_screen_orientation">画面の向きの制御</a></li>
+</ul>