H5调用摄像头
作者：互联网
1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <meta name="viewport" content="width=device-width, initial-scale=1.0">
6 <meta http-equiv="X-UA-Compatible" content="ie=edge">
7 <title>摄像头拍照</title>
8 </head>
9 <body>
10 <video id="video" width="480" height="320" controls>
11 </video>
12 <div>
13 <button id="capture">拍照</button>
14 </div>
15 <canvas id="canvas" width="480" height="320"></canvas>
16 <script>
17 //访问用户媒体设备的兼容方法
18 function getUserMedia(constraints, success, error) {
19 if (navigator.mediaDevices.getUserMedia) {
20 //最新的标准API
21 navigator.mediaDevices.getUserMedia(constraints).then(success).catch(error);
22 } else if (navigator.webkitGetUserMedia) {
23 //webkit核心浏览器
24 navigator.webkitGetUserMedia(constraints,success, error)
25 } else if (navigator.mozGetUserMedia) {
26 //firfox浏览器
27 navigator.mozGetUserMedia(constraints, success, error);
28 } else if (navigator.getUserMedia) {
29 //旧版API
30 navigator.getUserMedia(constraints, success, error);
31 }
32 }
33
34 let video = document.getElementById('video');
35 let canvas = document.getElementById('canvas');
36 let context = canvas.getContext('2d');
37
38 function success(stream) {
39 //兼容webkit核心浏览器
40 let CompatibleURL = window.URL || window.webkitURL;
41 //将视频流设置为video元素的源
42 console.log(stream);
43
44 //video.src = CompatibleURL.createObjectURL(stream);
45 video.srcObject = stream;
46 video.play();
47 }
48
49 function error(error) {
50 console.log(`访问用户媒体设备失败${error.name}, ${error.message}`);
51 }
52
53 if (navigator.mediaDevices.getUserMedia || navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia) {
54 //调用用户媒体设备, 访问摄像头
55 getUserMedia({video : {width: 480, height: 320}}, success, error);
56 } else {
57 alert('不支持访问用户媒体');
58 }
59
60 document.getElementById('capture').addEventListener('click', function () {
61 context.drawImage(video, 0, 0, 480, 320);
62 })
63 </script>
64 </body>
65 </html>
参考站:https://blog.csdn.net/c_kite/article/details/78536451
标签：调用,success,getUserMedia,H5,video,error,navigator,摄像头,constraints 来源： https://www.cnblogs.com/kuangke/p/14278565.html