<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>調用本地攝像頭拍照</title>
</head>
<body>
<video id="video" width="480" height="320" controls>
</video>
<div>
<button id="capture">拍照</button>
</div>
<canvas id="canvas" width="480" height="320"></canvas>
<script>
let video = document.getElementById('video');
let canvas = document.getElementById('canvas');
let context = canvas.getContext('2d');
if (navigator.mediaDevices.getUserMedia || navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia){
//調用用戶媒體設備, 訪問攝像頭
getUserMedia({video : {width: 480, height: 320}}, success, error);
} else {
alert('不支持訪問用戶媒體');
}
document.getElementById('capture').addEventListener('click', function () {
context.drawImage(video, 0, 0, 480, 320);
})
//訪問用戶媒體設備的兼容方法
function getUserMedia(constraints, success, error) {
if (navigator.mediaDevices.getUserMedia) {
//最新的標準API
navigator.mediaDevices.getUserMedia(constraints).then(success).catch(error);
} else if (navigator.webkitGetUserMedia) {
//webkit核心瀏覽器
navigator.webkitGetUserMedia(constraints,success, error)
} else if (navigator.mozGetUserMedia) {
//firfox瀏覽器
navigator.mozGetUserMedia(constraints, success, error);
} else if (navigator.getUserMedia) {
//舊版API
navigator.getUserMedia(constraints, success, error);
}
}
function success(stream) {
//兼容webkit核心瀏覽器
let CompatibleURL = window.URL || window.webkitURL;
//將視頻流設置爲video元素的源
console.log(stream);
//video.src = CompatibleURL.createObjectURL(stream);
video.srcObject = stream;
video.play();
}
function error(error) {
console.log(`訪問用戶媒體設備失敗${error.name}, ${error.message}`);
}
</script>
</body>
</html>
