javascript实现blob加密视频源地址的方法

<video id="my-video" class="video-js" playsinline controls preload="auto" controlslist="nodownload" controlslist="nofullscreen" width="100%" height="240"      poster="upload/moviepic/2019-08-02/1564739500xyzp.png" data-setup="{}">    <source src="" type="video/mp4">    <source src="" type="video/ogg">    <source src="" type="video/webm">    <p class="vjs-no-js"> To view this video please enable JavaScript, and consider upgrading to a web browser that <a href="http://videojs.com/html5-video-support/" target="_blank">supports HTML5 video</a> </p>  </video>

 <script type="text/javascript">  var video = document.getElementById("my-video");  window.URL = window.URL || window.webkitURL;  var xhr = new XMLHttpRequest();  var play_url = 'test.mp4';  xhr.open("GET", play_url, true);  xhr.responseType = "blob";  xhr.onload = function() {  if (this.status == 200) {  var blob = this.response;  console.log(blob);  video.onload = function(e) {  window.URL.revokeObjectURL(video.src);  };  video.src = window.URL.createObjectURL(blob);  }  }  xhr.send(); </script>