js实现可兼容IE、FF、Chrome、Opera及Safari的音乐播放

/** 音乐播放器 
* @param obj  播放器id 
* @param file  音频文件 mp3: ogg: 
* @param loop  是否循环 
*/ 
function audioplayer(id, file, loop){ 
  var audioplayer = document.getElementById(id); 
  if(audioplayer!=null){ 
    document.body.removeChild(audioplayer); 
  } 
 
  if(typeof(file)!='undefined'){ 
    if(navigator.userAgent.indexOf("MSIE")>0){// IE 
   
    var player = document.createElement('bgsound'); 
    player.id = id; 
    player.src = file['mp3']; 
    player.setAttribute('autostart', 'true'); 
    if(loop){ 
      player.setAttribute('loop', 'infinite'); 
    } 
    document.body.appendChild(player); 
     
    }else{ // Other FF Chome Safari Opera 
   
    var player = document.createElement('audio'); 
    player.id = id; 
    player.setAttribute('autoplay','autoplay'); 
    if(loop){ 
      player.setAttribute('loop','loop'); 
    } 
    document.body.appendChild(player); 
     
    var mp3 = document.createElement('source'); 
    mp3.src = file['mp3']; 
    mp3.type= 'audio/mpeg'; 
    player.appendChild(mp3); 
     
    var ogg = document.createElement('source'); 
    ogg.src = file['ogg']; 
    ogg.type= 'audio/ogg'; 
    player.appendChild(ogg); 
     
    } 
  } 
} 

var file = []; 
file['mp3'] = '1.mp3'; 
file['ogg'] = '1.ogg'; 
audioplayer('audioplane', file, true); // 播放 
audioplayer('audioplane'); // 停止