[JavaScript知识库] html调用电脑摄像头

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[JavaScript知识库]html调用电脑摄像头

html调用电脑摄像头进行拍照demo

<!doctype html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>test</title>
    	<style>
            html,body{position:relative;height:100%;}
            .main { display: flex; flex-direction: row; justify-content:space-between;width:100%}
            #canvas{background-color:#eee;}
            .btnBox { display:flex;align-items:center;justify-content:center; position: absolute; bottom: 0px; left: 0px; width: 100%; height: 60px; background-color: #eee; border-top: solid 1px #ddd; }
            #btnSave{margin-left:20px;}
        </style>
	</head>
	<body>
        <div class="main">
            <video id="video" autoplay style="width: 640px;height: 480px"></video>
            <!--拍照按钮-->
            <!--描绘video截图-->
            <canvas id="canvas" width="640" height="480"></canvas>
        </div>
        
        <div class="text-center btnBox">
            <button id="capture" class="btn btn-success"><i class="fa fa-camera"></i> 拍照</button>  
            <button id="btnSave" class="btn btn-success"><i class="fa fa-save"></i> 使用此图片</button>
        </div>
  
        <script>
            window.onload = function () {
                //访问用户媒体设备的兼容方法
                function getUserMedia(constraints, success, error) {
                    if (navigator.mediaDevices.getUserMedia) {
                        //最新的标准API
                        navigator.mediaDevices.getUserMedia(constraints).then(success).catch(error);
                    } else if (navigator.webkitGetUserMedia) {
                        //webkit核心浏览器
                        navigator.webkitGetUserMedia(constraints, success, error)
                    } else if (navigator.mozGetUserMedia) {
                        //firfox浏览器
                        navigator.mozGetUserMedia(constraints, success, error);
                    } else if (navigator.getUserMedia) {
                        //旧版API
                        navigator.getUserMedia(constraints, success, error);
                    }
                }

                let video = document.getElementById('video');
                let canvas = document.getElementById('canvas');
                let context = canvas.getContext('2d');
                function success(stream) {
                    //兼容webkit核心浏览器
                    //let CompatibleURL = window.URL || window.webkitURL;
                    //将视频流设置为video元素的源
                    // console.log(stream);
                    //video.src = CompatibleURL.createObjectURL(stream);
                    video.srcObject = stream;
                    video.play();
                }
                function error(error) {
                    console.log(`访问用户媒体设备失败${error.name}, ${error.message}`);
                }

                if (navigator.mediaDevices.getUserMedia || navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia) {
                    if (!navigator.mediaDevices || !navigator.mediaDevices.enumerateDevices) {
                        console.log("enumerateDevices() not supported.");
                        return;
                    }
                    // 列出摄像头和麦克风
                    var exArray = [];
                    navigator.mediaDevices.enumerateDevices()
                        .then(function (devices) {
                            devices.forEach(function (device) {
                                // console.log(device.kind + ": " + device.label +
                                // " id = " + device.deviceId);
                                if (device.kind == "videoinput") {
                                    // alert(device.label);
                                    exArray.push(device.deviceId);
                                }
                            });
                            var mediaOpts = { video: { width: 420, height: 120 } };
                            var mediaOpts =
                            {
                                video:
                                {
                                    deviceId: { exact: exArray[1] }
                                }
                            };
                            //调用用户媒体设备, 访问摄像头
                            getUserMedia(mediaOpts, success, error);
                        })
                        .catch(function (err) {
                            console.log(err.name + ": " + err.message);
                        });

                } else {
                    alert('不支持访问用户媒体');
                }
                var img = new Image();
                document.getElementById('capture').addEventListener('click', function () {
                    context.drawImage(video, 0, 0, 640, 480);
                   //var image_data = context.getImageData(0, 0, 480, 320);
                    // var string = OCRAD(image_data.data);
                    // string = _arrayBufferToBase64(image_data);
                    var image = new Image();
                    image.src = canvas.toDataURL("image/jpeg");
                    console.log(image.src);
                
                })
            }
        </script>
	</body>
</html>