<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>调用摄像头拍照</title>
</head>
<body>
<video id="video" width="640" height="480" autoplay></video>
<button onclick="start()">开始</button>
<button onclick="paizao()">拍照</button>
<canvas id="canvas" width="640" height="480" ></canvas>
<script>
function start() {
navigator.mediaDevices.getUserMedia({ video: true }).then(stream => {
document.getElementById("video").srcObject = stream
})
}
function paizao() {
var canvas = document.getElementById("canvas");
var video = document.getElementById("video")
canvas.getContext("2d").drawImage(video, 0, 0, canvas.width, canvas.height);
}
</script>
</body>
</html>
