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Web Media Application
MediaDevices
MediaDevices 接口提供访问连接媒体输入的设备，如照相机和麦克风，以及屏幕共享等。它可以使你取得任何硬件资源的媒体数据。
事件
devicechange 系统中支持的设备变动时触发
方法
1. MediaDevices.enumerateDevices()
获取有关系统中可用的媒体输入和输出设备的一系列信息。
navigator.mediaDevices.enumerateDevices().then((...arg)=> console.log(arg))
2. MediaDevices.getUserMedia()
在用户通过提示允许的情况下，打开系统上的相机或屏幕共享和/或麦克风，并提供 MediaStream 包含视频轨道和/或音频轨道的输入。
navigator.mediaDevices.getUserMedia(constraints)
.then(function(stream) {
/* 使用这个stream stream */
})
.catch(function(err) {
/* 处理error */
});2.1 参数 constraints
{ audio: true, video: true }
{
audio: false,
video: { width: 1280, height: 720 }
}
//前置摄像头（默认）
{ video: { facingMode: "user" } }
//后置摄像头
{ video: { facingMode: { exact: "environment" } } }2.2 返回值
返回一个 Promise ， 这个Promise成功后的回调函数带一个 MediaStream 对象作为其参数。
example: /media-device/qr-code.html
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