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拍照.html
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拍照.html
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<!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>Document</title>
</head>
<body>
<canvas id="camera-shot-canvas"></canvas>
<video id="camera-shot-video"></video>
<button onclick="shot">拍照</button>
</body>
<script>
const cameraDevices = []
navigator.mediaDevices.enumerateDevices().then(deviceInfos => {
for (const deviceInfo of deviceInfos) {
if (deviceInfo.kind === 'videoinput') {
cameraDevices.push({
deviceId: deviceInfo.deviceId, // 摄像头的设备ID
label: deviceInfo.label || 'camera', // 摄像头的设备名称
})
}
}
})// 兼容不同浏览器版本的getUserMedia
function getUserMedia(constrains, success, error) {
if (navigator.mediaDevices.getUserMedia) {
//最新标准API
navigator.mediaDevices.getUserMedia(constrains).then(success).catch(error);
} else if (navigator.webkitGetUserMedia) {
//webkit内核浏览器
navigator.webkitGetUserMedia(constrains).then(success).catch(error);
} else if (navigator.mozGetUserMedia) {
//Firefox浏览器
navagator.mozGetUserMedia(constrains).then(success).catch(error);
} else if (navigator.getUserMedia) {
//旧版API
navigator.getUserMedia(constrains).then(success).catch(error);
}
}
const videoDom = document.querySelector('#camera-shot-video')
getUserMedia({
// video可直接传true，deviceId没传参数则使用默认的
video: {
width: 500,
height: 500,
deviceId: cameraDevices.length && cameraDevices[0].deviceId ? { exact: cameraDevices[0].deviceId } : undefined
},
audio: false,
}, stream => {
// 播放视频流(兼容旧版video src)
if ("srcObject" in videoDom) {
videoDom.srcObject = stream
} else {
videoDom.src = window.URL.createObjectURL(stream)
}
videoDom.onloadedmetadata = function (e) {
videoDom.play()
}
}, err => {
console.log(err);
that.$message.error('摄像头开启失败！')
})
const canvasDom = document.querySelector('#camera-shot-canvas')
function shot() {
canvasDom.getContext('2d').drawImage(
videoDom,
0,
0,
500,
500
)
}
</script>
</html>