js调用网络摄像头的方法

不支持IE浏览器(需要使用flash插件), 支持移动端, 未经过完全测试

PC端使用的时候, HTML页面需要预留video标签, canvas标签

移动端使用的时候, HTML页面需要预留file标签, canvas标签, img标签

(function (window, document) { window.camera = { init: function (options) { /** * options 属性示例 * videoID: video控件ID * canvasID: canvas控件ID * fileID: type为file的input控件的ID * imageID: img控件的ID * videoEnable: 是否启用摄像头 * audioEnable: 是否启用麦克风 * videoWidth: 视频宽度 * videoHeight: 视频高度 * photoWidth: 拍照宽度 * photoHeight: 拍照高度 */ _options = options; if (isMobileTerminal()) {initMobileTerminal(); } else {initComputerTerminal(); } }, photo: function () { if (isMobileTerminal()) {photoMobileTerminal(); } else {photoComputerTerminal(); } } }; let _options = null; function initComputerTerminal() { let videoDom = document.getElementById(_options.videoID); if (!videoDom) { alert(’Video 控件无效’); return; } let canvasDom = document.getElementById(_options.canvasID); if (!canvasDom) { alert(’Canvas 控件无效’); return; } canvasDom.setAttribute(’width’, _options.photoWidth + ’px’); canvasDom.setAttribute(’height’, _options.photoHeight + ’px’); let parameters = { video: _options.videoEnable ? {width: _options.videoWidth,height: _options.videoHeight } : false, audio: _options.audioEnable }; navigator.mediaDevices.getUserMedia(parameters) .then(function (MediaStream) {video.srcObject = MediaStream;video.play(); }).catch(function (reason) {console.log(reason);alert(reason); }); } function photoComputerTerminal() { let videoDom = document.getElementById(_options.videoID); if (!videoDom) { alert(’Video 控件无效’); return; } let canvasDom = document.getElementById(_options.canvasID); if (!canvasDom) { alert(’Canvas 控件无效’); return; } let context = canvasDom.getContext(’2d’); context.drawImage(videoDom, 0, 0, _options.photoWidth, _options.photoHeight); } function initMobileTerminal() { let fileDom = document.getElementById(_options.fileID); if (!fileDom) { alert(’File 控件无效’); return; } fileDom.setAttribute(’accept’, ’image/*’); fileDom.setAttribute(’capture’, ’camera’); let canvasDom = document.getElementById(_options.canvasID); if (!canvasDom) { alert(’Canvas 控件无效’); return; } canvasDom.setAttribute(’width’, _options.photoWidth + ’px’); canvasDom.setAttribute(’height’, _options.photoHeight + ’px’); let imageDom = document.getElementById(_options.imageID); if (!imageDom) { alert(’Image 控件无效’); return; } fileDom.addEventListener(’change’, function () { let file = fileDom.files[0]; let reader = new FileReader(); reader.onloadend = function () {imageDom.setAttribute(’src’, reader.result);setTimeout(function () { let context = canvas.getContext('2d'); context.drawImage(imageDom, 0, 0, _options.photoWidth, _options.photoHeight);}, 300); }; reader.readAsDataURL(file); }); } function photoMobileTerminal() { let fileDom = document.getElementById(_options.fileID); fileDom.click(); } function isMobileTerminal() { if (/AppleWebKit.*Mobile/i.test(navigator.userAgent) || /Mobile/.test(navigator.userAgent) || /MIDP|SymbianOS|NOKIA|SAMSUNG|LG|NEC|TCL|Alcatel|BIRD|DBTEL|Dopod|PHILIPS|HAIER|LENOVO|MOT-|Nokia|SonyEricsson|SIE-|Amoi|ZTE/.test(navigator.userAgent)) return /Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent); return false; }})(window, document);

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