js_呼叫攝像頭,拍照功能
阿新 • • 發佈:2021-12-20
<!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>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> //“世界是個敘述者, 而我們卻蒙上黑布, 嗤之以鼻。”訪問使用者媒體裝置的相容方法 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); } } let video = document.getElementById('video'); let canvas = document.getElementById('canvas'); let context = canvas.getContext('2d'); function success(stream) { //相容webkit核心瀏覽器 let CompatibleURL = window.URL || window.webkitURL; //將視訊流設定為video元素的源 console.log(stream); //video.src = CompatibleURL.createObjectURL(stream); video.srcObject = stream; video.play(); } function error(error) { console.log(`訪問使用者媒體裝置失敗${error.name}, ${error.message}`); } if (navigator.mediaDevices.getUserMedia || navigator.getUserMedia || navigator.webkitGetUserMedia || navigator .mozGetUserMedia) { //呼叫使用者媒體裝置, 訪問攝像頭 getUserMedia({ video: { width: 480, height: 320 } }, success, error); } else { alert('不支援訪問使用者媒體'); } // 點選拍照 document.getElementById('capture').addEventListener('click', function () { context.drawImage(video, 0, 0, 480, 320); console.log(canvas.toDataURL("image/png")) }) // canvas轉圖片 function convertCanvasToImage(canvas) { var image = new Image(); image.src = canvas.toDataURL("image/png"); return image; } </script> </body> </html>