브라우저에서 카메라를 찾아 사진을 찍고 카메라를 닫습니다.

	 var mediaStreamTrack;
    document.getElementById("start").addEventListener("click", function () {
        navigator.getUserMedia = navigator.getUserMedia ||
	    navigator.webkitGetUserMedia ||
	    navigator.mozGetUserMedia;
	    if (navigator.getUserMedia) {
	        navigator.getUserMedia({ audio: true, video: { width: 320, height: 320 } },
	                function(stream) {
	                 mediaStreamTrack = typeof stream.stop === 'function' ? stream : stream.getTracks()[1];
			            video.src = (window.URL || window.webkitURL).createObjectURL(stream);
			            video.play();
	                   /*  var video = document.getElementById("video");
	                    video.src = window.URL.createObjectURL(stream);
	                    video.onloadedmetadata = function(e) {
	                        console.log('nihao44eee4aaaaddda');
	                        video.play();
	                    }; */
	                },
	                function(err) {
	                    console.log("The following error occurred: " + err.name);
	                }
	        );
	    } else {
	        console.log("getUserMedia not supported");
	    }
    });
   document.getElementById("stop").addEventListener("click", function () {
   		mediaStreamTrack && mediaStreamTrack.stop();
    });
    document.getElementById("picture").addEventListener("click", function () {
    	var context = document.getElementById("canvas").getContext("2d");
        context.drawImage(video, 0, 0, 320, 320);
    });
    document.getElementById("sc").addEventListener("click", function () {
        var imgData=document.getElementById("canvas").toDataURL("image/png");
        var mmmd=getBase64Image(document.getElementById("mmm"));
        var data=imgData.substr(22);
        console.log(mmmd)
        debugger
        $.post('recorder/target/sc',{'sj':data});
    });
     function getBase64Image(img) {
          var canvastemp = document.createElement("canvas");
          canvastemp.width = img.width;
         canvastemp.height = img.height;
         var ctx = canvas.getContext("2d");
         ctx.drawImage(img, 0, 0, img.width, img.height);
         var dataURL = canvas.toDataURL("image/png");
         return dataURL
         // return dataURL.replace("data:image/png;base64,", "");
     }