获取视频或者音频时长

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//获取视频或者音频时长
var fileurl = URL.createObjectURL(file);
//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( "duration");
  console.log(duration);//单位：秒
});
//获取文件大小
var size = file.size;//单位：字节(byte)

js 秒转换成 时分秒

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var getTime= function(second_time){
  var time = parseInt(second_time) + "秒";
  if( parseInt(second_time )> 60){
    var second = parseInt(second_time) % 60;
    var min = parseInt(second_time/60);
    time = min + "分" + second + "秒";
    if( min > 60 ){
        min = parseInt(second_time / 60) % 60;
        var hour = parseInt( parseInt(second_time / 60) /60 );
        time = hour + "小时" + min + "分" + second + "秒";
        if( hour > 24 ){
            hour = parseInt( parseInt(second_time / 60) /60 ) % 24;
            var day = parseInt( parseInt( parseInt(second_time / 60) /60 ) / 24 );
            time = day + "天" + hour + "小时" + min + "分" + second + "秒";
        }
    }
  }
  return time;
}