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WebRTC最基本的功能是对视频和音频的控制，本文介绍getUserMedia对摄像头的控制
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="description" content="WebRTC demo1">
<meta name="viewport" content="width=device-width, user-scalable=yes, initial-scale=1, maximum-scale=1">
<meta name="mobile-web-app-capable" content="yes">
<title>getUserMedia</title>
</head>
<body>
<div id="container">
<video id="video" autoplay playsinline></video>
<button id="showVideo">Open camera</button>
<div id="errorMsg"></div>
</div>
<script type="text/javascript">
const constraints = { audio: false, video: true };
function handleSuccess(stream) {
video = document.querySelector('video');
video.srcObject = stream;
}
function handleError(error) {
if (error.name === 'ConstraintNotSatisfiedError') {
let v = constraints.video;
errorMsg(`The resolution ${v.width.exact}x${v.height.exact} px is not supported by your device.`);
} else if (error.name === 'PermissionDeniedError' || error.name === 'NotAllowedError') {
errorMsg('拒绝了授权访问该设备');
} else {
errorMsg(`getUserMedia error: ${error.name}`, error);
}
}
function errorMsg(msg, error) {
const errorElement = document.querySelector('#errorMsg');
errorElement.innerHTML += `<p>${msg}</p>`;
if (typeof error !== 'undefined') {
console.error(error);
}
}
async function init(e) {
try {
const stream = await navigator.mediaDevices.getUserMedia(constraints);
handleSuccess(stream);
e.target.disabled = true;
} catch (e) {
handleError(e);
}
}
document.querySelector('#showVideo').addEventListener('click', e => init(e));
</script>
</body>
</html>配置好nginx， 启动nginx服务器后访问 http://localhost:9999/webrtc1.html ，点击Open camera按钮可以启动摄像头，点击允许后可以看到摄像头拍摄的画面；部署到服务器后本文的例子也可以在手机正常访问（请注意需要提供https服务）。
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