先上代码：
<!doctype html>
<html lang="en">
<head>
<title>js调用摄像头拍照上传图片</title>
<meta charset="utf-8">
</head>
<body>
<button onclick="openMedia()">开启摄像头</button>
<video id="video" width="500px" height="500px" autoplay="autoplay"></video>
<canvas id="canvas" width="500px" height="500px"></canvas>
<button onclick="takePhoto()">拍照</button>
<img id="imgTag" src="" alt="imgTag">
<button onclick="closeMedia()">关闭摄像头</button>
<script>
let mediaStreamTrack=null; // 视频对象(全局)
function openMedia() {
let constraints = {
video: { width: 500, height: 500 },
audio: true
};
//获得video摄像头
let video = document.getElementById('video');
let promise = navigator.mediaDevices.getUserMedia(constraints);
promise.then((mediaStream) => {
mediaStreamTrack = typeof mediaStream.stop === 'function' ? mediaStream : mediaStream.getTracks()[1];
video.srcObject = mediaStream;
video.play();
});
}
// 拍照
function takePhoto() {
//获得Canvas对象
let video = document.getElementById('video');
let canvas = document.getElementById('canvas');
let ctx = canvas.getContext('2d');
ctx.drawImage(video, 0, 0, 500, 500);
// toDataURL --- 可传入'image/png'---默认, 'image/jpeg'
let img = document.getElementById('canvas').toDataURL();
// 这里的img就是得到的图片
console.log('img-----', img);
document.getElementById('imgTag').src=img;
}
// 关闭摄像头
function closeMedia() {
mediaStreamTrack.stop();
}
</script>
</body>
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