JS学习笔记（6）--音乐播放器

时间：2023-03-09 14:48:47
JS学习笔记（6）--音乐播放器

说明（2017.3.15）：

1. lrc.js里面存储LRC歌词的格式的数组，获取里面的时间轴，转为秒数。

2. 通过audio.currentTime属性，setinterval每秒获取歌曲播放的秒数。

3. 将两个时间比大小，如果“歌曲播放时间”>“歌词时间”，就输出这句歌词。

4. 补充需求：

（1）需要把歌词补充完整

（2）不是在控制台输出，直接在页面输出

（3）增加播放列表

music.html

 <!DOCTYPE html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <title>Document</title>

 </head>

 <body>

     <audio src="Taylor Swift - Love Story.mp3" id="audio" autoplay="autoplay" controls="controls" preload="auto">

     您的浏览器不支持audio属性，请更换浏览器再进行浏览。

     </audio>

     <button id="btnTime">time</button>

 </body>

 <script src="lrc.js"></script>

 <script type="text/javascript">

     var text = "[00:15.80]We were both young when I first saw you\

 [00:19.74]I closed my eyes and the flashback starts\

 [00:23.26]I'm standing there";

     var audio = document.getElementById("audio");

     btnTime.onclick = function(){

         var timeLrc = getTime();

         console.log(timeLrc);

     };

     var getTime = function(){

         // 不需要这个函数了，直接输出audio.currentTime这个时间进行比大小就可以

         // 获取03:14:33这种格式的当前播放时间

         var timeNow = audio.currentTime

         // console.log(timeNow);

         // 获取分钟数

         var timeMin = String(Math.floor(timeNow/60));

         // 如果分钟数是1位，前面加个0

         timeMin = timeMin.length<2 ? "0"+timeMin : timeMin;

         // console.log(timeMin);

         var timeSec = String(Math.floor(timeNow%60));

         timeSec = timeSec.length<2 ? "0"+timeSec : timeSec;

         // console.log(timeSec);

         var timeMil = String(timeNow);

         timeMil = timeMil.substr(timeMil.indexOf('.')+1,2)

         // console.log(timeMil);

         var timeLrc = timeMin + ":" + timeSec + "." + timeMil;

         return timeLrc;

     };

     var getLrcTime = function(i){

         // 获取歌词里的每句的时间

         var lrcTime = loveStory[i].substr(1,8);

         // 分钟转数字可以去掉前面的0

         lrcTimeMin = parseInt(lrcTime.split(":")[0]);

         // 虽然末尾有0，不过要转成数字比大小

         lrcTimeSec = parseFloat(lrcTime.split(":")[1]);

         lrcTime = lrcTimeMin*60+lrcTimeSec;

         // console.log(lrcTimeMin);

         // console.log(lrcTimeSec);

         // console.log(lrcTime);

         return lrcTime;

     };

     // getLrcTime();

     setInterval(function(){

         // 获取lrc.js文件中的歌词，每秒刷新一下，获取播放时间，然后跟歌词里的时间比对，如果播放时间大于歌词时间，就显示歌词。

         var timeNow = audio.currentTime

         for(var i = 0; i < loveStory.length; i++){

             var lrcTime = getLrcTime(i);

             // console.log(lrcTime);

             var lrcWord = loveStory[i].substr(10,loveStory[i].length);

             if(timeNow > lrcTime){

                 console.log(lrcTime);

                 console.log(lrcWord);

                 loveStory.splice(i,1);

             }else{

             }

         }

         // if (!audio.paused) {

         //     console.log(playTime.substr(0,5));

         //     // console.log(playTime);

         // }

     },1000);

 </script>

 </html>

lrc.js

 var loveStory = [

     "[00:15.80]We were both young when I first saw you",

     "[00:19.74]I closed my eyes and the flashback starts",

     "[00:23.26]I'm standing there",

     "[00:26.95]On a balcony in summer air",

     "[00:32.14]See the lights see the party the ball gowns",

     "[00:35.87]I see you make your way through the crowd",

     "[00:39.29]And say hello",

     "[00:43.38]Little did I know",

     "[00:48.07]That you were Romeo you were throwing pebbles",

     "[00:51.72]And my daddy said stay away from Juliet",

     "[00:55.38]And I was crying on the staircase",

     "[00:58.28]Begging you please don't go",

     "[01:02.74]And I said",

     "[01:04.25]Romeo take me somewhere we can be alone",

     "[01:08.38]I'll be waiting all there's left to do is run"

 ];

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