CSS 媒体特性 - aspect-ratio

CSS 媒体特性 **aspect-ratio** 用于检查视口或渲染表面的纵横比。纵横比是盒子宽度与高度的比率。此媒体查询允许您定位特定的纵横比并相应地应用不同的样式。

可能的值

**ratio** − 这是所需宽度与高度的比率，以分数或单个整数的形式表示。
**min-aspect-ratio** − 指定样式应用的最小纵横比。
**max-aspect-ratio** − 指定样式应用的最大纵横比。

语法

   @media (aspect-ratio: 4/3){
      //css-style to be applied
   }

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CSS aspect-ratio - ratio 值

以下示例演示了在传递比率值时 **aspect-ratio** 的用法

当视口的纵横比等于 2/2（宽度和高度为 120）时，div 元素的背景颜色变为黄色。
移动滑块时，将调用 **updateSize** 函数。此函数更改 iframe 的大小并更新标签。

Open Compiler

<html>
<head>
<style>
   iframe {
      display: block;
   }
</style>
</head>
<body>
   <label id="labelWidth" for="width">Width:150</label>
   <input id="width" name="width" type="range" min="120" max="200" step="4" value="150" />
   <label id="labelHeight" for="width">Height:150</label>
   <input id="height" name="height" type="range" min="120" max="200" step="4" value="150" />
   
   <iframe
   id="block"
   srcdoc="<style> @media (aspect-ratio: 2/2) { div { background: lightgreen; } } </style><div>To see the effect resize your viewport's width and height.</div>">
   </iframe>
   
   <script>
      const updateSize = (size, label) => {
         block.style[size] = `${eval(size).value}px`;
         label.textContent = `${size}: ${eval(size).value}`;
      };

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

CSS aspect-ratio - max-aspect-ratio 值

以下示例演示了 **max-aspect-ratio** 媒体特性如何将 **div** 元素的背景颜色更改为紫色，当视口的纵横比小于或等于 3/2 时 −

Open Compiler

<html>
<head>
<style>
   iframe {
      display: block;
   }
</style>
</head>
<body>
   <label id="labelWidth" for="width">Width:150</label>
   <input id="width" name="width" type="range" min="120" max="200" step="4" value="150" />
   <label id="labelHeight" for="width">Height:150</label>
   <input id="height" name="height" type="range" min="120" max="200" step="4" value="150" />
   
   <iframe
   id="block"
   srcdoc="<style> @media (max-aspect-ratio: 3/2) { div { background:violet; } } </style><div>To see the effect resize your viewport's width and height.</div>">
   </iframe>
      
   <script>
      const updateSize = (size, label) => {
         block.style[size] = `${eval(size).value}px`;
         label.textContent = `${size}: ${eval(size).value}`;
      };

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

CSS aspect-ratio - min-aspect-ratio 值

以下示例演示了 **min-aspect-ratio** 媒体特性如何将 **div** 元素的背景颜色更改为黄色，当视口的纵横比大于或等于 4/3 时 −

Open Compiler

<html>
<head>
<style>
   iframe {
      display: block;
   }
</style>
</head>
<body>
   <label id="labelWidth" for="width">Width:150</label>
   <input id="width" name="width" type="range" min="120" max="200" step="4" value="150" />
   <label id="labelHeight" for="width">Height:150</label>
   <input id="height" name="height" type="range" min="120" max="200" step="4" value="150" />
   
   <iframe
   id="block"
   srcdoc="<style> @media (min-aspect-ratio: 4/3) { div { background: yellow; } } </style><div>To see the effect resize your viewport's width and height.</div>">
   </iframe>
      
   <script>
      const updateSize = (size, label) => {
         block.style[size] = `${eval(size).value}px`;
         label.textContent = `${size}: ${eval(size).value}`;
      };

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

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