var audio ;
window.onload = function(){
initAudio();
}
var initAudio = function(){
//audio = document.createElement("audio")
//audio.src='Never Say Good Bye.ogg'
audio = document.getElementById('audio');
}
function getCurrentTime(id){
alert(parseInt(audio.currentTime) + '：秒');
}

function playOrPaused(id,obj){
if(audio.paused){
audio.play();
obj.innerHTML='暫停';
return;
}
audio.pause();
obj.innerHTML='播放';
}

function hideOrShowControls(id,obj){
if(audio.controls){
audio.removeAttribute('controls');
obj.innerHTML = '顯示控制框'
return;
}
audio.controls = 'controls';
obj.innerHTML = '隱藏控制框'
return;
}
function vol(id,type , obj){
if(type == 'up'){
var volume = audio.volume + 0.1;
if(volume >=1 ){
volume = 1 ;

}
audio.volume = volume;
}else if(type == 'down'){
var volume = audio.volume - 0.1;
if(volume <=0 ){
volume = 0 ;
}
audio.volume = volume;
}
document.getElementById('nowVol').innerHTML = returnFloat1(audio.volume);
}
function muted(id,obj){
if(audio.muted){
audio.muted = false;
obj.innerHTML = '開啟靜音';
}else{
audio.muted = true;
obj.innerHTML = '關閉靜音';
}
}
//保留一位小數點

function returnFloat1(value) {
value = Math.round(parseFloat(value) * 10) / 10;
if (value.toString().indexOf(".") < 0){
value = value.toString() + ".0";
}
return value;
}

<a href="javascript:void(0);" onclick="getCurrentTime('firefox');">獲取播放時間</a>
<a href="javascript:void(0);" onclick="playOrPaused('firefox',this);">播放</a>
<a href="javascript:void(0);" onclick="hideOrShowControls('firefox',this);">隱藏控制框</a>
<a href="javascript:void(0);" onclick="muted('firefox',this);">開啟靜音</a>
<input type="button" value="+" id="upVol" onclick="vol('firefox' , 'up' , this )"/>音量<input type="button" value="-" onclick="vol('firefox' , 'down' ,this )"/>
<audio src="/images/audio/Never Say Good Bye.ogg" id="audio" controls="controls" ></audio>

當前音量：<span id = "nowVol"> - </span>