使用javascript实现电脑摄像头的打开和截图的功能，供大家参考，具体内容如下
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>摄像头调用实例</title> <script type="text/javascript" src="https://www.jb51.net/jquery-3.2.1.min.js"></script> <script type="text/javascript"> var video, mediaStreamTrack, canvas;//声明全局变量 //打开摄像头 function dk() { video = document.getElementById("v1"); var videoObj = { "video" : true }; var errBack = function(error) { console.log("Video capture error: ", error.code); }; //根据浏览器的不同选取不同的支持 if (navigator.getUserMedia) { // Standarda navigator.getUserMedia(videoObj, function(stream) { mediaStreamTrack = typeof stream.stop === 'function' ? stream : stream.getTracks()[1]; video.src = stream;//获取摄像头抓取的到字节流 video.play();//实时播放摄像头 }, errBack); } else if (navigator.webkitGetUserMedia) { // WebKit-prefixed navigator.webkitGetUserMedia(videoObj, function(stream) { mediaStreamTrack = typeof stream.stop === 'function' ? stream : stream.getTracks()[1]; video.src = window.webkitURL.createObjectURL(stream); video.play(); }, errBack); } else if (navigator.mozGetUserMedia) { // Firefox-prefixed navigator.mozGetUserMedia(videoObj, function(stream) { mediaStreamTrack = typeof stream.stop === 'function' ? stream : stream.getTracks()[1]; video.src = window.URL.createObjectURL(stream); video.play(); }, errBack); } } //截图 function jq() { canvas = document.getElementById("c1"); var context = canvas.getContext("2d"); //将视频当前的页面转换为图片，显示到画板中 context.drawImage(video, 0, 0, 200, 202); //把canvas图像转为img图片 /* var src = canvas.toDataURL("image/jpeg"); createImg(src); */ } //关闭摄像头 function gb() { mediaStreamTrack.stop(); } //生成图片 /* function createImg(src) { var dv = document.getElementById("dv1"); var img = document.createElement("img"); img.setAttribute("src", src); img.setAttribute("width", 205); img.setAttribute("height", 205); dv.appendChild(img); } */ //上传 /* function sc() { $.post('TestServlet', { "img" : canvas.toDataURL().substr(22) }, function(data, status) { alert(status != "success" ? "图片处理出错！" : data == "yes" ? "图片上传完成！" : data); }); } */ </script> <style type="text/css"> input[type="button"]{ border: 1px solid red; } </style> </head> <body> <div> <input type="button" value="打开"> <input type="button" value="截取图像"> <input type="button" value="关闭"> </div> <div> <!--视频 --> <video></video> <br /> <!--画板 --> <canvas></canvas> <br /> </div> <!--记录每次截图的结果 --> <!-- <div></div> --> </body> </html>
但是谷歌浏览器可以打开摄像头，无法获取实时数据。火狐比较好用。