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原生JS实现音乐播放器的示例代码

2021-03-05 04:07 190 查看 https://www.geek-share.com/det

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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