如何实现html5的摄像头的调用

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<video id="video" width="640" height="480" autoplay></video><button id="snap">Snap Photo</button><canvas id="canvas" width="640" height="480"></canvas><script>// Put event listeners into placewindow.addEventListener("DOMContentLoaded", function() {// Grab elements, create settings, etc.var videoObj = { "video": true },errBack = function(error) {console.log("Video capture error: ", error.code); };// Put video listeners into placeif(navigator.getUserMedia) { // Standardnavigator.getUserMedia(videoObj, function(stream) {video.src = stream;video.play();}, errBack);} else if(navigator.webkitGetUserMedia) { // WebKit-prefixednavigator.webkitGetUserMedia(videoObj, function(stream){video.src = window.webkitURL.createObjectURL(stream);video.play();}, errBack);}else if(navigator.mozGetUserMedia) { // Firefox-prefixednavigator.mozGetUserMedia(videoObj, function(stream){video.src = window.URL.createObjectURL(stream);video.play();}, errBack);}}, false);    var canvas = document.getElementById("canvas"),        context = canvas.getContext("2d"),        video = document.getElementById("video");    document.getElementById("snap").addEventListener("click", function () {          context.drawImage(video, 0, 0, 640, 480);    });  </script>

还有一点需要记住，关于设备调用的api都需要在服务器上跑，单机是不行的

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