注意：此代码获取的只是本地视频，更多代码可以在WebRTC的官网查看。
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=yes, initial-scale=1, maximum-scale=1">
<meta name="mobile-web-app-capable" content="yes">
<base target="_blank">
<title>WebRTC samples</title>
<script type="text/javascript">
var video;
var constraints = window.constraints = {
audio: true,
video: true
};
window.onload = function(){
video = document.getElementById("myVideo");
getMedia();
}
function handleSuccess(stream) {
var videoTracks = stream.getVideoTracks();
console.log('Got stream with constraints:', constraints);
console.log('Using video device: ' + videoTracks[0].label);
stream.oninactive = function() {
console.log('Stream inactive');
};
window.stream = stream; // make variable available to browser console
video.srcObject = stream; //通过视频元素播放捕获的MediaStream
}
function handleError(error) {
if (error.name === 'ConstraintNotSatisfiedError') {
errorMsg('The resolution ' + constraints.video.width.exact + 'x' +
constraints.video.width.exact + ' px is not supported by your device.');
} else if (error.name === 'PermissionDeniedError') {
errorMsg('Permissions have not been granted to use your camera and ' +
'microphone, you need to allow the page access to your devices in ' +
'order for the demo to work.');
}
errorMsg('getUserMedia error: ' + error.name, error);
}
function errorMsg(msg, error) {
if (typeof error !== 'undefined') {
console.error(error);
}
}
//获取本地媒体
function getMedia(){
navigator.mediaDevices.getUserMedia(constraints).
then(handleSuccess).catch(handleError);
/* 还有一种写法是:
var getUserMedia = (navigator.getUserMedia ||
navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia ||
navigator.msGetUserMedia);
这种写法已经过时了,用navigator.mediaDevices.getUserMedia更好
*/
}
</script>
<style>
video{
width:320px;
height:240px;
border:1px solid black;
}
</style>
</head>
<body>
<div style="width:30%;vertical-align:top">
<div>
<video id="myVideo" aotoplay="aotoplay" controls playsinline />
</div>
</div>
</body>
</html>
效果图：