CSS媒体特性 - 方向

CSS orientation 媒体特性用于确定设备屏幕或页面是处于纵向还是横向方向。

设备的方向并不总是与屏幕的方向相同。例如，如果您在纵向方向的设备上打开软键盘，屏幕将比高宽更宽。在这种情况下，浏览器将使用横向样式而不是纵向样式。

可能的值

portrait − 当视口的高度超过其宽度时应用此值，这通常表示设备垂直放置。
landscape − 当视口的宽度大于其高度时应用此值，这通常表示设备水平放置。

语法

orientation: portrait|landscape;

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CSS orientation - portrait 值

以下示例演示了当设备处于portrait方向时，盒子的背景颜色会变为绿色：

Open Compiler

<html>
<head>
<style>
   iframe {
      display: block;
      height: 200px;
   }
</style>
</head>
<body>
   <label id="labelWidth" for="width"></label>
   <input id="width" type="range" min="120" max="250" step="4" />
   
   <iframe
   id="block"
   srcdoc="<style> @media (orientation: portrait) { div { background: lightgreen; } } </style><div><h3>To see the effect resize your viewport's width.</h3> <p>When box is in portrait orientation background changes to green color, otherwise background color will remain white.</p> </div>">
   </iframe>
   
   <script>
      const updateSize = (size, label) => {
         block.style[size] = `${eval(size).value}px`;
      };

      width.oninput = () => updateSize("width", labelWidth);
   </script>
</body>
</html>

CSS orientation - landscape 值

以下示例演示了当设备处于landscape方向时，盒子的背景颜色会变为黄色：

Open Compiler

<html>
<head>
<style>
   iframe {
      display: block;
      height: 200px;
   }
</style>
</head>
<body>
   <label id="labelWidth" for="width"></label>
   <input id="width" type="range" min="120" max="250" step="4" />
   
   <iframe
   id="block"
   srcdoc="<style> @media (orientation: landscape) { div { background: yellow; } } </style><div><h3>To see the effect resize your viewport's width.</h3> <p>When box is in portrait orientation background changes to yellow color, otherwise background color will remain white.</p> </div>">
   </iframe>
   
   <script>
      const updateSize = (size, label) => {
         block.style[size] = `${eval(size).value}px`;
      };

      width.oninput = () => updateSize("width", labelWidth);
   </script>
</body>
</html>

打印页面