在此页

• 特性
• 范例
• 规范
• 浏览器兼容性
• 相关话题

这是 实验性技术
检查 浏览器兼容性表格 要小心谨慎在生产中使用这之前。

MediaSettingsRange 接口的 MediaStream 图像捕获 API provides the possible range and value size of PhotoCapabilities.imageHeight and PhotoCapabilities.imageWidth 。 PhotoCapabilities object can be retrieved by calling ImageCapture.PhotoCapabilities() .

特性

MediaSettingsRange.max

Returns the maximum value of this settings.

MediaSettingsRange.min

Returns the minimum value of this setting.

MediaSettingsRange.step

Returns the minimum difference between consecutive values of this setting.

范例

The following example, extracted from Chrome's Image Capture / Photo Resolution Sample , uses the results from getPhotoCapabilities().imageWidth to modify the size of an input range.

const input = document.querySelector('input[type="range"]');
var imageCapture;
navigator.mediaDevices.getUserMedia({video: true})
.then(mediaStream => {
  document.querySelector('video').srcObject = mediaStream;
  const track = mediaStream.getVideoTracks()[0];
  imageCapture = new ImageCapture(track);
  return imageCapture.getPhotoCapabilities();
})
.then(photoCapabilities => {
  const settings = imageCapture.track.getSettings();
  input.min = photoCapabilities.imageWidth.min;
  input.max = photoCapabilities.imageWidth.max;
  input.step = photoCapabilities.imageWidth.step;
  return imageCapture.getPhotoSettings();
})
.then(photoSettings => {
  input.value = photoSettings.imageWidth;
})
.catch(error => console.log('Argh!', error.name || error));
						

规范

规范	状态	注释
MediaStream 图像捕获 The definition of 'MediaSettingsRange' in that specification.	工作草案	初始定义。

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
MediaSettingsRange	Chrome 59	Edge ≤79	Firefox ?	IE ?	Opera 46	Safari ?	WebView Android 59	Chrome Android 59	Firefox Android ?	Opera Android 43	Safari iOS ?	Samsung Internet Android 7.0
max	Chrome 59	Edge ≤79	Firefox ?	IE ?	Opera 46	Safari ?	WebView Android 59	Chrome Android 59	Firefox Android ?	Opera Android 43	Safari iOS ?	Samsung Internet Android 7.0
min	Chrome 59	Edge ≤79	Firefox ?	IE ?	Opera 46	Safari ?	WebView Android 59	Chrome Android 59	Firefox Android ?	Opera Android 43	Safari iOS ?	Samsung Internet Android 7.0
step	Chrome 59	Edge ≤79	Firefox ?	IE ?	Opera 46	Safari ?	WebView Android 59	Chrome Android 59	Firefox Android ?	Opera Android 43	Safari iOS ?	Samsung Internet Android 7.0

图例

完整支持

完整支持

兼容性未知 ?

兼容性未知

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

元数据

• 最后修改： 2019 年 3 月 23 日

相关话题

1. MediaSettingsRange
2. 特性

   1. max
   2. min
   3. step