本文主要介紹了原生JS實(shí)現(xiàn)音樂(lè)播放器的示例代碼，分享給大家，具體如下:

按照播放器的功能劃分，對(duì)播放器的屬性和DOM元素歸類(lèi)，實(shí)現(xiàn)同一功能的元素和屬性保存在同一對(duì)象中，便于管理和操作

const control = { //存放播放器控制 play: document.querySelector(’#myplay’), ... index: 2,//當(dāng)前播放歌曲序號(hào) ...}const audioFile = { //存放歌曲文件及相關(guān)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(jī)’, ’單曲’], index: 0}const songInfo = { // 存放歌曲信息的DOM容器 name: document.querySelector(’.song-name’), ...}播放控制

功能：控制音樂(lè)的播放和暫停，上一首，下一首，播放完成及相應(yīng)圖標(biāo)修改audio所用API：audio.play() 和 audio.pause()和audio ended事件

// 音樂(lè)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(lè)播放，更改圖標(biāo)及開(kāi)啟播放動(dòng)畫(huà) play.classList.remove(’songStop’); play.classList.add(’songStart’); control.albumCover.classList.add(’albumRotate’); control.albumCover.style.animationPlayState = ’running’; } else { //音樂(lè)暫停，更改圖標(biāo)及暫停播放動(dòng)畫(huà) ... }}function prevHandle() { // 根據(jù)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(jī)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(jī)播放 const randomNum = Math.random() * (songListLens - 1); control.index = Math.round(randomNum); } else if (modeIndex == 2) {//單曲 } reload(songList);}播放進(jìn)度條控制

功能：實(shí)時(shí)更新播放進(jìn)度，點(diǎn)擊進(jìn)度條調(diào)整歌曲播放進(jìn)度audio所用API：audio timeupdate事件，audio.currentTime

// 播放進(jìn)度實(shí)時(shí)更新audioFile.file.addEventListener(’timeupdate’, lyricAndProgressMove);// 通過(guò)拖拽調(diào)整進(jìn)度control.progressDot.addEventListener(’click’, adjustProgressByDrag);// 通過(guò)點(diǎn)擊調(diào)整進(jìn)度control.progressWrap.addEventListener(’click’, adjustProgressByClick);

播放進(jìn)度實(shí)時(shí)更新：通過(guò)修改相應(yīng)DOM元素的位置或者寬度進(jìn)行修改

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(jìn)度條移動(dòng) 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);}

拖拽調(diào)整進(jìn)度：通過(guò)拖拽移動(dòng)進(jìn)度條，并且同步更新歌曲播放進(jìn)度

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(diǎn)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(jìn)度條狀態(tài)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}%`}

點(diǎn)擊進(jìn)度條調(diào)整：通過(guò)點(diǎn)擊進(jìn)度條，并且同步更新歌曲播放進(jìn)度

function adjustProgressByClick(e) { const wrap = control.progressWrap; const wrapWidth = wrap.offsetWidth; const wrapLeft = getOffsetLeft(wrap); const disX = e.pageX - wrapLeft; changeProgressBarPos(disX, wrapWidth)}歌詞顯示及高亮

功能：根據(jù)播放進(jìn)度，實(shí)時(shí)更新歌詞顯示，并高亮當(dāng)前歌詞（通過(guò)添加樣式）audio所用API：audio timeupdate事件，audio.currentTime

// 歌詞顯示實(shí)時(shí)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(dòng) 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(shè)置

功能：點(diǎn)擊跳轉(zhuǎn)播放模式，并修改相應(yīng)圖標(biāo)audio所用API：無(wú)

// 播放模式設(shè)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')}

項(xiàng)目預(yù)覽

代碼地址：https://github.com/hcm083214/audio-player

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