举一下改变声音的例子吧。
<SCRIPT Language="VBScript">
Function btnUp_OnClick()
Dim iVolume
iVolume = document.all.oSound.volume + 500
If iVolume <0 Then
document.all.oSound.volume = iVolume
End If
End Function
Function btnDown_OnClick()
Dim iVolume
iVolume = document.all.oSound.volume - 500
If iVolume >-10000 Then
document.all.oSound.volume = iVolume
End If
End Function
Function btnSilence_OnClick()
document.all.oSound.volume = -10000
End Function
</SCRIPT>
<bgSound src="音乐地址" id="oSound"/>
<button name="btnUp">加大</button>
<button name="btnDown">减小</button>
<button name="btnSilence">静音</button>
---------------------------------------------
你定义了一个变量，但没有赋值，所以不行，你需要对它进行赋值，如：
Dim iVolume
iVolume = document.all.oSound.volume
这样才能进行比较。
GainNode
<input type="range" min="0" max="100" id="volume" /><script type="text/javascript">var tank = new Audio("http://qianduannotes.duapp.com/file/tankWar.mp3")
tank.loop = true var mario = new Audio("http://qianduannotes.duapp.com/file/SuperMario.mp3")
mario.loop = true var AudioContext = AudioContext || webkitAudioContext var context = new AudioContext() var source1 = context.createMediaElementSource(tank) var source2 = context.createMediaElementSource(mario) var gain1 = context.createGain() var gain2 = context.createGain() //连接：source → gain → destination source1.connect(gain1)
source2.connect(gain2)
gain1.connect(context.destination)
gain2.connect(context.destination) //音量控制
var value
onload = volume.onchange = function(){
gain1.gain.value = volume.value / 100
gain2.gain.value = 1 - volume.value / 100
}
tank.onload = mario.onlond = function(){
console.log("var1, var2")
}
tank.play()
mario.play()</script>
