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• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

getPhotoCapabilities() 方法在 ImageCapture interface returns a Promise that resolves with a PhotoCapabilities object containing the ranges of available configuration options.

句法

const capabilitiesPromise = imageCaptureObj.getPhotoCapabilities()
					

返回值

A Promise that resolves with a PhotoCapabilities 对象。

范例

The following example, extracted from Chrome's Image Capture / Photo Resolution Sample , uses the results from getPhotoCapabilities() to modify the size of an input range. This example also shows how the ImageCapture object is created using a MediaStreamTrack retrieved from a device's MediaStream .

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 'getPhotoCapabilities()' in that specification.	工作草案	初始定义。

浏览器兼容性

The compatibility table on 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
getPhotoCapabilities	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： Feb 11, 2020

相关话题

1. ImageCapture
2. 构造函数

   1. ImageCapture() constructor
3. 特性

   1. track
4. 方法

   1. getPhotoCapabilities()
   2. getPhotoSettings()
   3. grabFrame()
   4. takePhoto()
5. 继承：

   1. EventTarget