1 <!DOCTYPE html>
2 <html>
3 <head>
4 <title>摄像头调用</title>
5 <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" charset="utf-8" />
6 <style type="text/css">
7 video,canvas{
8 margin-top: 10px;
9 }
10 </style>
11 </head>
12 <body>
13 <input type="button" title="开启摄像头" value="开启摄像头" onclick="getMedia();" />
14 <input type="button" title="关闭摄像头" value="关闭摄像头" onclick="shutdown()"><br/>
15 <video height="200px" autoplay="autoplay" poster="cover.png" ></video><hr/> //poster是video的封面图片，可以自己加一个，也可以直接去掉
16
17 <input type="button" title="拍照" value="拍照" onclick="getPhoto();"/><br/>
18 <canvas id="canvas1" height="200px" ></canvas>
19
20 <script type="text/javascript">
21 var video = document.querySelector('video');
22
23 var canvas1 = document.getElementById('canvas1');
24 var context1 = canvas1.getContext('2d');
25
26 navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
27 window.URL = window.URL || window.webkitURL || window.mozURL || window.msUR;
28
29 var exArray = []; //存储设备源ID
30 MediaStreamTrack.getSources(function (sourceInfos) {
31 for (var i = 0; i != sourceInfos.length; ++i) {
32 var sourceInfo = sourceInfos[i];
33 //这里会遍历audio,video，所以要加以区分
34 if (sourceInfo.kind === 'video') {
35 exArray.push(sourceInfo.id);
36 }
37 }
38 });
39
40 function getMedia() {
41 if (navigator.getUserMedia) {
42 navigator.getUserMedia({
43 'video': {
44 'optional': [{
45 'sourceId': exArray[1] //0为前置摄像头，1为后置
46 }]
47 },
48 'audio':false //关闭声音
49 }, successFunc, errorFunc); //success是获取成功的回调函数
50 }
51 else {
52 alert('Native device media streaming (getUserMedia) not supported in this browser.');
53 }
54 }
55 function shutdown() {
56 successFunc(null);
57 }
58 function successFunc(stream) {
59 //alert('Succeed to get media!');
60 if (video.mozSrcObject !== undefined) {
61 //Firefox中，video.mozSrcObject最初为null，而不是未定义的，我们可以靠这个来检测Firefox的支持
62 video.mozSrcObject = stream;
63 }
64 else {
65 video.src = window.URL && window.URL.createObjectURL(stream) || stream;
66 }
67 }
68 function errorFunc(e) {
69 alert('Error！'+e);
70 }
71 //拍照
72 function getPhoto() {
73 context1.drawImage(video, 0, 0,270,200); //将video对象内指定的区域捕捉绘制到画布上指定的区域，实现拍照。
74 }
75 </script>
76 </body>
77 </html>
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