HTMLMediaElement: played 属性

const media = document.querySelector("audio");
const playedTimeRanges = media.played;
let timePlayed = 0;
// calculate the total time the media has played
for (let i = 0; i < playedTimeRanges.length; i++) {
  timePlayed += playedTimeRanges.end(i) - playedTimeRanges.start(i);
}
console.log(`The media played for a total of ${timePlayed} seconds.`);