HTML5拍照和摄像机功能实战详解HTML5 和小程序实现拍照图片旋转、压缩和上传功能H5调用相机拍照并压缩图片的实例代码HTML5 Plus 实现手机APP拍照或相册选择图片上传功能HTML5调用手机摄像头拍照的实现思路及代码HTML5中5个简单实用的API（第二篇，含全屏、可见性、拍照、预加载、电html5拍照功能实现代码(htm5上传文件)使用HTML5拍照示例代码基于HTML5超酷摄像头（HTML5 webcam）拍照功能实现代码

 -------------------------------------------------------------- const videoConstraints = { width: 1366, height: 768 }; const videoNode = document.querySelector('#video'); let stream = await navigator.mediaDevices.getUserMedia({ audio: true, video: videoConstraints }); videoNode.srcObject = stream; videoNode.play();

 // enumerateDevices获取所有媒体设备 const mediaDevices = await navigator.mediaDevices.enumerateDevices(); // 通过设备实例king属性videoinput，过滤获取摄像头设备 const videoDevices = mediaDevices.filter(item => item.kind === 'videoinput') || []; // 获取前置摄像头 const videoDeviceId = videoDevices[0].deviceId; const videoConstraints = { deviceId: { exact: videoDeviceId }, width: 1366, height: 768 }; let stream = await navigator.mediaDevices.getUserMedia({ audio: true, video: videoConstraints }); // 获取后置摄像头 const videoDeviceId = videoDevices[1].deviceId; const videoConstraints = { deviceId: { exact: videoDeviceId }, width: 1366, height: 768 }; let stream = await navigator.mediaDevices.getUserMedia({ audio: true, video: videoConstraints }); // 依次类推...

 // 通过canvas捕捉video流，生成base64格式图片 const canvas = document.createElement('canvas'); const context = canvas.getContext('2d'); canvas.width = 1366; canvas.height = 768; context.drawImage(videoNode, 0, 0, canvas.width, canvas.height); download(canvas.toDataURL('image/jpeg')); // 下载图片 function download (src) { if (!src) return; const a = document.createElement('a'); a.setAttribute('download', new Date()); a.href = src; a.click(); }

 let stream = await navigator.mediaDevices.getUserMedia({ audio: true, video: videoConstraints }); // 3s后关闭摄像头 setTimeout(function () { stream.getTracks().forEach(track => track.stop()); stream = null; }, 3000);

 const videoConstraints = { width: 1366, height: 768 }; let stream = await navigator.mediaDevices.getUserMedia({ audio: true, video: videoConstraints }); let mediaRecorder = new MediaRecorder(stream); let mediaRecorderChunks = []; // 记录数据流 mediaRecorder.ondataavailable = (e) => { mediaRecorderChunks.push(e.data); }; mediaRecorder.onstop = (e) => { // 通过Blob对象，创建文件二进制数据实例。 let recorderFile = new Blob(mediaRecorderChunks, { 'type' : mediaRecorder.mimeType }); mediaRecorderChunks = []; const file = new File([this.recorderFile], (new Date).toISOString().replace(/:|\./g, '-') + '.mp4', { type: 'video/mp4' }); download(URL.createObjectURL(file)); // 下载视频 function download (src) { if (!src) return; const a = document.createElement('a'); a.setAttribute('download', new Date()); a.href = src; a.click(); } }; mediaRecorder.stop(); // 停止录制，触发onstop事件