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Html调用摄像头并拍照

2017-02-27 12:29 465 查看

<!DOCTYPE>
<html>
<title></title>
<meta charset="utf-8" />
<head></head>
<script type="text/javascript">

// Put event listeners into place
window.addEventListener("DOMContentLoaded", function() {
// Grab elements, create settings, etc.
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var video = document.getElementById('video');
var mediaConfig =  { video: true };
var errBack = function(e) {
console.log('An error has occurred!', e)
};

// Put video listeners into place
if(navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
navigator.mediaDevices.getUserMedia(mediaConfig).then(function(stream) {
video.src = window.URL.createObjectURL(stream);
video.play();
});
}

/* Legacy code below! */
else if(navigator.getUserMedia) { // Standard
navigator.getUserMedia(mediaConfig, function(stream) {
video.src = stream;
video.play();
}, errBack);
} else if(navigator.webkitGetUserMedia) { // WebKit-prefixed
navigator.webkitGetUserMedia(mediaConfig, function(stream){
video.src = window.webkitURL.createObjectURL(stream);
video.play();
}, errBack);
} else if(navigator.mozGetUserMedia) { // Mozilla-prefixed
navigator.mozGetUserMedia(mediaConfig, function(stream){
video.src = window.URL.createObjectURL(stream);
video.play();
}, errBack);
}

// Trigger photo take
document.getElementById('snap').addEventListener('click', function() {
context.drawImage(video, 0, 0, 640, 480);
});
}, false);

</script>
<body>
<video id="video" width="640" height="480" autoplay></video>
<button id="snap" class="sexyButton">Snap Photo</button>
<canvas id="canvas" width="640" height="480"></canvas>
</body>
</html>

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