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h5页面调用摄像头(简易版)

<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>

 

h5页面调用摄像头(简易版)