本文主要介绍了原生 JS 实现 音乐播放器 的示例代码，分享给大家，具体如下:
效果图
音乐播放器 播放控制 播放进度条控制 歌词显示及高亮 播放模式设置
播放器属性归类
按照播放器的功能划分，对播放器的属性和DOM元素归类，实现同一功能的元素和属性保存在同一对象中，便于管理和操作
const control = { //存放播放器控制
play: document.querySelector( '#myplay' ),
...
index: 2, //当前播放歌曲序号
...
}
const audioFile = { //存放歌曲文件及相关信息
file: document.getElementsByTagName( 'audio' )[0],
currentTime: 0,
duration: 0,
}
const lyric = { // 歌词显示栏配置
ele: null ,
totalLyricRows: 0,
currentRows: 0,
rowsHeight: 0,
}
const modeControl = { //播放模式
mode: [ '顺序' , '随机' , '单曲' ],
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：控制音乐的播放和暂停，上一首，下一首，播放完成及相应图标修改
audio所用API：audio.play() 和 audio.pause()和audio ended事件
// 音乐的播放和暂停，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) {
//音乐播放，更改图标及开启播放动画
play.classList.remove( 'songStop' );
play.classList.add( 'songStart' );
control.albumCover.classList.add( 'albumRotate' );
control.albumCover.style.animationPlayState = 'running' ;
} else {
//音乐暂停，更改图标及暂停播放动画
...
}
}
function prevHandle() { // 根据播放模式重新加载歌曲
const modeIndex = modeControl.index;
const songListLens = songList.length;
if (modeIndex == 0) { //顺序播放
let index = --control.index;
index == -1 ? (index = songListLens - 1) : index;
control.index = index % songListLens;
} else if (modeIndex == 1) { //随机播放
const randomNum = Math.random() * (songListLens - 1);
control.index = Math.round(randomNum);
} else if (modeIndex == 2) { //单曲
}
reload(songList);
}
function nextHandle() {
const modeIndex = modeControl.index;
const songListLens = songList.length;
if (modeIndex == 0) { //顺序播放
control.index = ++control.index % songListLens;
} else if (modeIndex == 1) { //随机播放
const randomNum = Math.random() * (songListLens - 1);
control.index = Math.round(randomNum);
} else if (modeIndex == 2) { //单曲
}
reload(songList);
}
播放进度条控制
功能：实时更新播放进度，点击进度条调整歌曲播放进度
audio所用API：audio timeupdate事件，audio.currentTime
// 播放进度实时更新
audioFile.file.addEventListener( 'timeupdate' , lyricAndProgressMove);
// 通过拖拽调整进度
control.progressDot.addEventListener( 'click' , adjustProgressByDrag);
// 通过点击调整进度
control.progressWrap.addEventListener( 'click' , adjustProgressByClick);
播放进度实时更新：通过修改相应DOM元素的位置或者宽度进行修改
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);
//进度条移动
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);
}
拖拽调整进度：通过拖拽移动进度条，并且同步更新歌曲播放进度
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
//点击放大方便操作
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) { //进度条状态更新
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}%`
}
点击进度条调整：通过点击进度条，并且同步更新歌曲播放进度
function adjustProgressByClick(e) {
const wrap = control.progressWrap;
const wrapWidth = wrap.offsetWidth;
const wrapLeft = getOffsetLeft(wrap);
const disX = e.pageX - wrapLeft;
changeProgressBarPos(disX, wrapWidth)
}
歌词显示及高亮
功能：根据播放进度，实时更新歌词显示，并高亮当前歌词（通过添加样式）
audio所用API：audio timeupdate事件，audio.currentTime
// 歌词显示实时更新
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;
//歌词移动
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)}`)
}
}
})
}
播放模式设置
功能：点击跳转播放模式，并修改相应图标
audio所用API：无
// 播放模式设置
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" )
}
项目预览
代码地址： https://github.com/hcm083214/audio-player
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原文链接：https://juejin.cn/post/6932662088250687501
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