} else {
// 防止再新的浏览器里使用它，应为它已经不再支持了
v.src = window.URL.createObjectURL(stream);
}
v.onloadedmetadata = function (e) {
v.play();
videoPlaying = true;
};
}).catch(err => {
console.error(err.name + ": " + err.message);
})
document.getElementById('take').addEventListener('click', function () {
if (videoPlaying) {
let canvas = document.getElementById('canvas');
canvas.width = v.videoWidth;
canvas.height = v.videoHeight;
canvas.getContext('2d').drawImage(v, 0, 0);
let data = canvas.toDataURL('image/webp');
document.getElementById('photo').setAttribute('src', data);
}
}, false);
})();
</script>
</body>
</html>
