利用javascript调用摄像头，可以配合socket开发监控系统

时间：2024-07-30 20:06:50
<html>

<head>

    <meta http-equiv="content-type" content="text/html; charset=utf-8">

    <title>摄像头的调用</title>

</head>

<body>

    <video autoplay id="sourcevid" style="width:320;height:240px"></video>

    <canvas id="output" style="display:none"></canvas>

    <script type="text/javascript" charset="utf-8">

        // 发送画面

        //var socket = new WebSocket("ws://"+document.domain+":8080");

        var back = document.getElementById('output');

        var backcontext = back.getContext('2d');

        var video = document.getElementsByTagName('video')[0];

        var success = function(stream){

            video.src = window.URL.createObjectURL(stream);

        }

        /*

        socket.onopen = function(){

            draw();

        }

        */

        var draw = function(){

            try{

                backcontext.drawImage(video,0,0, back.width, back.height);

            }catch(e){

                if (e.name == "NS_ERROR_NOT_AVAILABLE") {

                    return setTimeout(draw, 100);

                } else {

                    throw e;

                }

            }

            // socket.send(back.toDataURL("image/jpeg", 0.5));

            setTimeout(draw, 100);

        }

        navigator.getUserMedia = navigator.getUserMedia

            || navigator.webkitGetUserMedia

            || navigator.mozGetUserMedia

            || navigator.msGetUserMedia;

        navigator.getUserMedia({video:true, audio:false}, success, console.log);

        /*

        // 接收画面

        var receiver_socket = new WebSocket("ws://"+document.domain+":8008");

        var image = document.getElementById('receiver');

        receiver_socket.onmessage = function(data)

        {

            image.src=data.data;

        }

        */

    </script>

</body>

</html>

　　

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