使用原生JavaScript构建简易音乐播放器

HTML结构与CSS样式实现

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" href="css/music.css">
</head>
<body>
<audio src="" id="mymusic"></audio>
<div class="music">
 <div class="pic_div"> <img src="images/music/pictures/disc.png" alt="" class="disc"> <img src="images/music/pictures/default.jpg" alt="" id="music_pic"> <span class="dot"></span>
 <div class="music_program">
 <div id="prograss"></div>
 </div>
 <div class="time">
 <p><span id="currenttime">0:00</span><span>/</span><span id="duration">0:00</span></p>
 </div>
 <div class="music_menu"> <span onClick="backMusic()"></span> <span onClick="playPause()" id="playbtn"></span> <span onClick="nextMusic()"></span> </div>
 </div>
</div>
</body>
<script src="js/music.js"></script>
</html>

@charset "utf-8";
/* CSS Document */
.music {
 height: 150px;
 width: 150px;
 background:rgba(98,91,91,0.9);
}
.pic_div {
 position: relative;
}
.dot {
 width: 15px;
 height: 15px;
 background: #464545;
 position: absolute;
 border: 2px solid white;
 border-radius: 50%;
 top: 40px;
 left: 85px;
}
.disc {
 width: 100px;
 position: absolute;
 right: 5px;
 transform: rotate(30deg);
}
#music_pic {
 width: 100px;
 position: absolute;
}
.music_program {
 height: 2px;
 width: 100px;
 background: #555;
 position: relative;
 top: 100px;
}
.music_program div {
 height: 100%;
 width: 0%;
 background: red;
}
.time {
 width: 100px;
 height: 20px;
 position: relative;
 top: 85px;
 overflow: hide;
}
.time p {
 padding-left: 33px;
}
.time p span:nth-of-type(2) {
 padding: 0 5px;
}
.music_menu {
 width: 150px;
 height: 25px;
 position: relative;
 top: 85px;
}
.music_menu span {
 width: 30px;
 height: 25px;
 display: inline-block;
 cursor: pointer;
}
.music_menu span:nth-of-type(1) {
 margin-left: 8px;
 background: url(../images/music/pictures/back.png) no-repeat 7px;
}
.music_menu span:nth-of-type(2) {
 margin-left: 14px;
 background: url(../images/music/pictures/play.png) no-repeat 10px;
}
.music_menu span:nth-of-type(3) {
 margin-left: 14px;
 background: url(../images/music/pictures/forward.png) no-repeat 7px;
}

JavaScript核心逻辑控制

// JavaScript Document
var music=document.getElementById("mymusic");
 var prograss=document.getElementById("prograss");
 var curtxt=document.getElementById("currenttime");
 var duration=document.getElementById("duration");
 var music_pic=document.getElementById("music_pic");
 var deg=0;//旋转角度
 var disctimer,prograsstimer;//碟片计时器,进度条计时器
 var musicindex=0;//音乐索引
 var musics=new Array("nicengshishaonian.mp3","huanian.mp3","chunfengshili.mp3");//音乐数组
 var music_pics=new Array("000002","000001","000001");
 
 
 //旋转碟片
 var disc=document.getElementsByClassName('disc');
 
 //音乐时间显示
 function curtime(txt,misic)
 {
 if(music.currentTime<10)
 {
  txt.innerHTML="0:0"+Math.floor(music.currentTime);
 }else
 if(music.currentTime<60)
 {
  txt.innerHTML="0:"+Math.floor(music.currentTime);
 }
 else
 {
  var minet=parseInt(music.currentTime/60);
  var sec=music.currentTime-minet*60;
  if(sec<10)
  {
  txt.innerHTML="0"+minet+":"+"0"+parseInt(sec);
  }
  else
  {
  txt.innerHTML="0"+minet+":"+parseInt(sec);
  }
 }
 }
 
 //播放暂停
 function playPause()
 {
 var btn=document.getElementById("playbtn");
 if(music.paused)
 {
  music.play();
  clearInterval(disctimer);//清除碟片的定时器
  btn.style.background="url(images/music/pictures/pause.png) no-repeat 10px";//改变播放暂停键的图标
  disctimer=setInterval(function(){
  disc[0].style.transform="rotate("+deg+"deg)";
  deg+=5;
  
  //每秒设置进度条长度
  },100);
  prograsstimer=setInterval(function(){
  prograss.style.width=(music.currentTime)*100 / (music.duration)+"%";
  curtime(curtxt,music);
  if(music.currentTime>=music.duration-1)//片尾跳转下一曲
  {
  musicindex++;//音乐索引加一
  if(musicindex>=musics.length)//如果音乐索引超过长度，将音乐索引清零
  {
  musicindex=0;
  }
  getMusic();
  music.play();//重载音乐后进行播放
  }
  },1000);
 }
 else
 {
  music.pause();//停止音乐
  btn.style.background="url(images/music/pictures/play.png) no-repeat 10px";
  clearInterval(disctimer);//清除碟片滚动的定时器
  clearInterval(prograsstimer);//清除进度条的定时器
 }
 }
 
 //下一曲
 function nextMusic()
 {
 musicindex++;//音乐索引加一
 if(musicindex>=musics.length)//如果音乐索引超过长度，将音乐索引清零
 {
 musicindex=0;
 }
 getMusic();
 music.play();
 }
 
 //上一曲
 function backMusic()
 {
 musicindex--;
 if(musicindex<0)//如果索引小于0，将索引变为最大值
 {
 musicindex=musics.length-1;
 }
 getMusic();
 music.play();
 }
 
 //读取音乐
 function getMusic()
 {
 music.src="images/music/"+musics[musicindex];//改变音乐的SRC
 music_pic.src="images/music/pictures/"+music_pics[musicindex]+".jpg";
 if(music.readyState="complete")
 {
  setTimeout(function(){
  duration.innerHTML=parseInt(music.duration/60)+":"+parseInt(music.duration%60);
  },1000);//一秒后读取音乐的总时长
  
 }
 }
 
 
 window.onload=function(){
 getMusic();
 
 }