js 获取上传视频文件的时长(秒)

  var binaryData = [];
  // 传入file
  binaryData.push(this.list[i].file);
  //获取视频或者音频时长
  var fileurl = URL.createObjectURL(new Blob(binaryData, {type: "application/zip"}));
  //经测试，发现audio也可获取视频的时长
  var audioElement = new Audio(fileurl);
  var duration;
  audioElement.addEventListener("loadedmetadata", function (_event) {
      duration = audioElement.duration;
      console.log("视频的时长为:",duration);//单位：秒
  });