[Tip]blob影片下載，破解blob影片加密

  function downloadBlobs(blob) {
	const fileName = "video.mp4";
	const a = document.createElement('a');
	a.href = blob;
    a.download = fileName;
    a.textContent = '一定要有textContent，不然click事件無法觸發'
    a.click(); 
  }
downloadBlobs(blob);