1.
<html><head><bgsound id=bgs src="song1.mid" loop="-1"></head>
<body><select size=1 onchange="document.all.bgs.src=this.value">
<option value="song1.mid">1</option>
<option value="song2.mid">2</option>
<option value="song3.mid">3</option>
<option value="song4.mid">4</option>
<option value="song5.mid">5</option>
</select>
</body></html>
<html><head><bgsound id=bgs src="song1.mid" loop="-1"></head>
<body><select size=1 onchange="document.all.bgs.src=this.value">
<option value="song1.mid">1</option>
<option value="song2.mid">2</option>
<option value="song3.mid">3</option>
<option value="song4.mid">4</option>
<option value="song5.mid">5</option>
</select>
</body></html>
选择本机里的音乐文件作为网页的背景音乐
<bgsound id=bgs src="song1.mid" loop="-1">
<INPUT type=file onPropertyChange="document.all.bgs.src=this.value">
<input type=checkbox class=checkbox1 id=havebgsound onclick="HaveBgsound()" checked> 背景音乐
请选择背景音乐：
<select id=bgsoundsel onchange="ChangeBgsound()" style="background-color:#f0f8ff">
<option value="midi/wqs.mid">刘德华忘情水</option>
<option value="midi/xxnda.mid">谢谢你的爱</option>
<option value="midi/kr.mid">宽容</option>
<option value="midi/hktk.mid">海阔天空</option>
<option value="midi/df.mid">短发</option>
<option value="midi/eva.mid">EVA主题曲</option>
<option value="midi/eyesonme.mid">EyesOnMe</option>
<option value="midi/ytwz.mid">樱桃小丸子</option>
<option value="midi/qz.mid">棋子</option>
<option value="midi/zhs.mid">再回首</option>
<option value="midi/ygzyh.mid">月光之云海</option>
<option value="midi/ysyyy.mid">一生有意义</option>
</select>（切换速度有可能有点慢，按<font color=red>ESC</font>键停止播放）
</td></tr>
</table><script language=javascript>
function ChangeBgsound()
{
havebgsound.checked=true;
newsrc=bgsoundsel.options[bgsoundsel.selectedIndex].value;
bgsound1.src=newsrc;
}
function HaveBgsound()
{
if (bgsound1.src!="")
{ bgsound1.src="";}
else
{ bgsound1.src=bgsoundsel.options[bgsoundsel.selectedIndex].value;}
}
</script>