How to solve the problem of browser calling camera in javascript
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The browser uses webrtc to call the camera.
If (navigator.mediaDevices&&navigator.mediaDevices.getUserMedia) {
Navigator.mediaDevices.getUserMedia ({
'audio':true
'video': {facingMode:'user'} / / facingMode: {exact: "environment"} call the rear camera
}) .then (function (mediaStream) {
GetVideoStream (mediaStream)
}) .catch (function (error) {
Console.log (error)
Parent.layer.msg ('disabled permission detected, please refresh the page and try again', {
Area: ['20%, 8%, 8%]
Offset: ['46%, 40%, 40%]
})
})
} elseif (navigator.getUserMedia) {
Navigator.getUserMedia ({
'video':true
'audio':true
}, getVideoStream)
} else {
Parent.layer.msg ('this browser does not support calling camera', {
Area: ['20%, 8%, 8%]
Offset: ['46%, 40%, 40%]
})
}
How do browsers call the camera?
But I tested it on Huawei Android, also using a chrome browser, but using a front-facing camera.
Can it be said that the front and rear cameras of Android and win10 are opposite?
I changed {facingMode:'user'} to facingMode: {exact: "environment"} (standard is called rear camera, but actually front on tablet)
Chrome pop-up detection permission is disabled (this is the effect of my layer), the actual error is OverconstrainedError, Baidu, all said that do not limit width, height and so on, but I did not set these things ah.
When I tested it on the Edge browser, everything was normal. {facingMode:'user'} called the front or front, and facingMode: {exact: "environment"} called the rear, just like Android, which ruled out the conclusion that the front and rear cameras of Android and win10 are opposite!
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