h5页面如何调用摄像头代码分享

<input type=button value=OpenVideo id=btnOpenVideo /><input type=button value=TakePicture id=btnTakePicture /><input type=button value=CloseVideo id=btnCloseVideo /><br /><video style=width:500px;height:500px;border:1px solid #000000; id=videoTest></video><canvas style=width:500px;height:500px;border:1px solid #000000; id=canvasTest></canvas><script type=text/javascript>  window.onload = function () {
    let btnOpenVideo = document.getElementById('btnOpenVideo');
    let btnTakePicture = document.getElementById('btnTakePicture');
    let btnCloseVideo = document.getElementById('btnCloseVideo');
    let video = document.getElementById('videoTest');
    let canvas = document.getElementById('canvasTest').getContext('2d');
    btnOpenVideo.onclick = function () {
      window.navigator.getUserMedia({
        video: true/*视频/摄像头*/
        /*audio:true*//*音频/麦克风*/
      }, function (param) {         video.src = window.URL.createObjectURL(param);/*设置video控件路径,实时显示摄像头的图像*/        btnCloseVideo.onclick = function () {/*关闭摄像头*/          if (param.getTracks())/*Chrome*/            param.getTracks()[0].stop();           else            param.stop();         };         btnTakePicture.onclick = function () {/*拍照*/          canvas.drawImage(document.getElementById('videoTest'), 0, 0, 500, 500);/*将拍摄的照片画到canvas中*/        };       }, function (err) {         alert(err);       });     };   };</script>

 

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