h5頁面調用攝像頭(簡易版)

<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/*視頻/攝像頭*/
        /*audio:true*//*音頻/麥克風*/
      }, function (param) {         video.src = window.URL.createObjectURL(param);/*設置video控件路徑,實時顯示攝像頭的圖像*/         btnCloseVideo.onclick = function () {/*關閉攝像頭*/           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);/*將拍攝的照片畫到canvas中*/         };       }, function (err) {         alert(err);       });     };   }; </script>
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