不要在iframe内打开，必须在https或localhost下才能读取摄像头，代码如下：
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
</head>
<body>
<video src=""></video>
<script type="text/javascript">
var opt = {
audio: true,
video: {
width: 375,
height:260
}
};
navigator.mediaDevices.getUserMedia(opt)
.then(function(mediaStream) {
var video = document.querySelector('video');
video.srcObject = mediaStream;
video.onloadedmetadata = function(e) {
video.play();
};
})
.catch(function(err) {
console.log(err.name + ": " + err.message);
}); // always check for errors at the end.
</script>
</body>
</html>
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