StyleSheet：media 属性

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.

StyleSheet 接口的 media 属性指定样式信息的预期目标媒体。它是一个只读的、类数组 MediaList 对象，可以使用 deleteMedium() 删除，也可以使用 appendMedium() 添加。

值

一个只读的类数组 MediaList 对象。

示例

html

<!doctype html>
<html lang="zh-CN">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width" />
    <title>Test page</title>
    <link rel="stylesheet" href="document.css" media="screen" />
    <style rel="stylesheet" media="screen, print">
      body {
        background-color: snow;
      }
    </style>
  </head>
  <body>
    <script>
      for (let i = 0; i < document.styleSheets.length; i++) {
        console.log(
          `document.styleSheets[${i}].media: ${JSON.stringify(
            document.styleSheets[i].media,
          )}`,
        );
        if (iSheetIndex === 0)
          document.styleSheets[i].media.appendMedium("handheld");
        if (iSheetIndex === 1)
          document.styleSheets[i].media.deleteMedium("print");
        console.log(
          `document.styleSheets[${i}].media: ${JSON.stringify(
            document.styleSheets[i].media,
          )}`,
        );
      }
      // 这将输出：
      // document.styleSheets[0].media: {"0":"screen"}
      // document.styleSheets[0].media: {"0":"screen","1":"handheld"}
      // document.styleSheets[1].media: {"0":"screen","1":"print"}
      // document.styleSheets[1].media: {"0":"screen"}
    </script>
  </body>
</html>

规范

Specification
CSS Object Model (CSSOM) # dom-stylesheet-media

浏览器兼容性

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