原生JS實現音樂播放器的示例代碼

const control = { //存放播放器控制
  play: document.querySelector('#myplay'),
 ...
  index: 2,//當前播放歌曲序號
 ...
}

const audioFile = { //存放歌曲文件及相關信息
  file: document.getElementsByTagName('audio')[0],
  currentTime: 0,
  duration: 0,
}

const lyric = { // 歌詞顯示欄配置
  ele: null,
  totalLyricRows: 0,
  currentRows: 0,
  rowsHeight: 0,
}

const modeControl = { //播放模式
  mode: ['順序', '隨機', '單曲'],
  index: 0
}

const songInfo = { // 存放歌曲信息的DOM容器
  name: document.querySelector('.song-name'),
 ...
}

// 音樂的播放和暫停，上一首，下一首控制
control.play.addEventListener('click',()=>{
  control.isPlay = !control.isPlay;
  playerHandle();
} );
control.prev.addEventListener('click', prevHandle);
control.next.addEventListener('click', nextHandle);
audioFile.file.addEventListener('ended', nextHandle);

function playerHandle() {
  const play = control.play;
  control.isPlay ? audioFile.file.play() : audioFile.file.pause();
  if (control.isPlay) {
 //音樂播放，更改圖標及開啟播放動畫
    play.classList.remove('songStop');
    play.classList.add('songStart');
    control.albumCover.classList.add('albumRotate');
    control.albumCover.style.animationPlayState = 'running';
  } else {
    //音樂暫停，更改圖標及暫停播放動畫
 ...
  }
}


function prevHandle() {  // 根據播放模式重新加載歌曲
  const modeIndex = modeControl.index;
  const songListLens = songList.length;
  if (modeIndex == 0) {//順序播放
    let index = --control.index;
    index == -1 ? (index = songListLens - 1) : index;
    control.index = index % songListLens;
  } else if (modeIndex == 1) {//隨機播放
    const randomNum = Math.random() * (songListLens - 1);
    control.index = Math.round(randomNum);
  } else if (modeIndex == 2) {//單曲
  }
  reload(songList);
}

function nextHandle() {
  const modeIndex = modeControl.index;
  const songListLens = songList.length;
  if (modeIndex == 0) {//順序播放
    control.index = ++control.index % songListLens;
  } else if (modeIndex == 1) {//隨機播放
    const randomNum = Math.random() * (songListLens - 1);
    control.index = Math.round(randomNum);
  } else if (modeIndex == 2) {//單曲
  }
  reload(songList);
}

// 播放進度實時更新
audioFile.file.addEventListener('timeupdate', lyricAndProgressMove);
// 通過拖拽調整進度
control.progressDot.addEventListener('click', adjustProgressByDrag);
// 通過點擊調整進度
control.progressWrap.addEventListener('click', adjustProgressByClick);

function lyricAndProgressMove() {
  const audio = audioFile.file;
  const controlIndex = control.index;
 // 歌曲信息初始化
  const songLyricItem = document.getElementsByClassName('song-lyric-item');
  if (songLyricItem.length == 0) return;
  let currentTime = audioFile.currentTime = Math.round(audio.currentTime);
  let duration = audioFile.duration = Math.round(audio.duration);

  //進度條移動
  const progressWrapWidth = control.progressWrap.offsetWidth;
  const currentBarPOS = currentTime / duration * 100;
  control.progressBar.style.width = `${currentBarPOS.toFixed(2)}%`;
  const currentDotPOS = Math.round(currentTime / duration * progressWrapWidth);
  control.progressDot.style.left = `${currentDotPOS}px`;

  songInfo.currentTimeSpan.innerText = formatTime(currentTime);

}

function adjustProgressByDrag() {
  const fragBox = control.progressDot;
  const progressWrap = control.progressWrap
  drag(fragBox, progressWrap)
}

function drag(fragBox, wrap) {
  const wrapWidth = wrap.offsetWidth;
  const wrapLeft = getOffsetLeft(wrap);

  function dragMove(e) {
    let disX = e.pageX - wrapLeft;
    changeProgressBarPos(disX, wrapWidth)
  }
  fragBox.addEventListener('mousedown', () => { //拖拽操作
    //點擊放大方便操作
    fragBox.style.width = `14px`;fragBox.style.height = `14px`;fragBox.style.top = `-7px`;
    document.addEventListener('mousemove', dragMove);
    document.addEventListener('mouseup', () => {
      document.removeEventListener('mousemove', dragMove);
      fragBox.style.width = `10px`;fragBox.style.height = `10px`;fragBox.style.top = `-4px`;
    })
  });
}

function changeProgressBarPos(disX, wrapWidth) { //進度條狀態更新
  const audio = audioFile.file
  const duration = audioFile.duration
  let dotPos
  let barPos

  if (disX < 0) {
    dotPos = -4
    barPos = 0
    audio.currentTime = 0
  } else if (disX > 0 && disX < wrapWidth) {
    dotPos = disX
    barPos = 100 * (disX / wrapWidth)
    audio.currentTime = duration * (disX / wrapWidth)
  } else {
    dotPos = wrapWidth - 4
    barPos = 100
    audio.currentTime = duration
  }
  control.progressDot.style.left = `${dotPos}px`
  control.progressBar.style.width = `${barPos}%`
}

function adjustProgressByClick(e) {

  const wrap = control.progressWrap;
  const wrapWidth = wrap.offsetWidth;
  const wrapLeft = getOffsetLeft(wrap);
  const disX = e.pageX - wrapLeft;
  changeProgressBarPos(disX, wrapWidth)
}

// 歌詞顯示實時更新
audioFile.file.addEventListener('timeupdate', lyricAndProgressMove);

function lyricAndProgressMove() {
  const audio = audioFile.file;
  const controlIndex = control.index;

  const songLyricItem = document.getElementsByClassName('song-lyric-item');
  if (songLyricItem.length == 0) return;
  let currentTime = audioFile.currentTime = Math.round(audio.currentTime);
  let duration = audioFile.duration = Math.round(audio.duration);
  let totalLyricRows = lyric.totalLyricRows = songLyricItem.length;
  let LyricEle = lyric.ele = songLyricItem[0];
  let rowsHeight = lyric.rowsHeight = LyricEle && LyricEle.offsetHeight;
  //歌詞移動
  lrcs[controlIndex].lyric.forEach((item, index) => {
    if (currentTime === item.time) {
      lyric.currentRows = index;
      songLyricItem[index].classList.add('song-lyric-item-active');
      index > 0 && songLyricItem[index - 1].classList.remove('song-lyric-item-active');
      if (index > 5 && index < totalLyricRows - 5) {
        songInfo.lyricWrap.scrollTo(0, `${rowsHeight * (index - 5)}`)
      }

    }
  })
}

// 播放模式設置
control.mode.addEventListener('click', changePlayMode);

function changePlayMode() {
  modeControl.index = ++modeControl.index % 3;
  const mode = control.mode;
  modeControl.index === 0 ?
    mode.setAttribute("class", "playerIcon songCycleOrder") :
    modeControl.index === 1 ?
      mode.setAttribute("class", "playerIcon songCycleRandom ") :
      mode.setAttribute("class", "playerIcon songCycleOnly")
}