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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: orientation
+slug: Web/CSS/@media/orientation
+tags:
+ - '@media'
+ - CSS
+ - 参考
+translation_of: Web/CSS/@media/orientation
+---
+<div>{{cssref}}</div>
+
+<p><a href="/zh-CN/docs/CSS">CSS</a> <a href="/zh-CN/docs/Web/CSS/Media_Queries/Using_media_queries#Media_features">媒体属性</a><strong>屏幕方向</strong>(<strong><code>orientation</code></strong>)可用于测试视口 {{glossary("viewport")}}(或者对于<a href="/zh-CN/docs/Web/CSS/Paged_media">分页媒体</a>而言的页面框盒)的横纵方向。</p>
+
+<div class="note">
+<p><strong>注意:</strong>此属性不等价于<span class="syntaxbox"><em>设备</em></span>的屏幕旋转方向。在许多设备上,当屏幕方向为纵向时,打开软键盘将导致视口 viewport 的宽度大于高度,从而导致浏览器突然改用横向样式,而不是保持纵向。</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<p><code>orientation</code> 属性被指定为下列关键字值中的任意一个。</p>
+
+<h3 id="关键字值">关键字值</h3>
+
+<dl>
+ <dt><code>portrait</code></dt>
+ <dd>viewport 处于纵向,即高度大于等于宽度。</dd>
+ <dt><code>landscape</code></dt>
+ <dd>viewport 处于横向,即宽度大于高度。</dd>
+</dl>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="HTML">HTML</h3>
+
+<pre class="brush: html">&lt;div&gt;Box 1&lt;/div&gt;
+&lt;div&gt;Box 2&lt;/div&gt;
+&lt;div&gt;Box 3&lt;/div&gt;
+</pre>
+
+<h3 id="CSS">CSS</h3>
+
+<pre class="brush: css">body {
+ display: flex;
+}
+
+div {
+ background: yellow;
+}
+
+@media (orientation: landscape) {
+ body {
+ flex-direction: row;
+ }
+}
+
+@media (orientation: portrait) {
+ body {
+ flex-direction: column;
+ }
+}</pre>
+
+<h3 id="结果">结果</h3>
+
+<p>{{EmbedLiveSample("Example")}}</p>
+
+<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('CSS4 Media Queries', '#orientation', 'orientation')}}</td>
+ <td>{{Spec2('CSS4 Media Queries')}}</td>
+ <td>No change.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('CSS3 Media Queries', '#orientation', 'orientation')}}</td>
+ <td>{{Spec2('CSS3 Media Queries')}}</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("css.at-rules.media.orientation")}}</p>