问如何使用Javascript播放mp3？

EN

// source: https://stackoverflow.com/a/11331200/4298200
function Sound(source, volume, loop)
{
    this.source = source;
    this.volume = volume;
    this.loop = loop;
    var son;
    this.son = son;
    this.finish = false;
    this.stop = function()
    {
        document.body.removeChild(this.son);
    }
    this.start = function()
    {
        if (this.finish) return false;
        this.son = document.createElement("embed");
        this.son.setAttribute("src", this.source);
        this.son.setAttribute("hidden", "true");
        this.son.setAttribute("volume", this.volume);
        this.son.setAttribute("autostart", "true");
        this.son.setAttribute("loop", this.loop);
        document.body.appendChild(this.son);
    }
    this.remove = function()
    {
        document.body.removeChild(this.son);
        this.finish = true;
    }
    this.init = function(volume, loop)
    {
        this.finish = false;
        this.volume = volume;
        this.loop = loop;
    }
}

var foo = new Sound("url", 100, true);
foo.start();
foo.stop();
foo.start();
foo.init(100, false);
foo.remove();
//Here you you cannot start foo any more

//Create the audio tag
var soundFile = document.createElement("audio");
soundFile.preload = "auto";

//Load the sound file (using a source element for expandability)
var src = document.createElement("source");
src.src = fileName + ".mp3";
soundFile.appendChild(src);

//Load the audio tag
//It auto plays as a fallback
soundFile.load();
soundFile.volume = 0.000000;
soundFile.play();

//Plays the sound
function play() {
   //Set the current time for the audio file to the beginning
   soundFile.currentTime = 0.01;
   soundFile.volume = volume;

   //Due to a bug in Firefox, the audio needs to be played after a delay
   setTimeout(function(){soundFile.play();},1);
}