用分帧实现，把其中一个frame的显示高度（或宽度）定义为0，在其中设置背景音乐，另外一个frame内的页面切换不影响整个背景音乐的播放。
例子：
框架页
<![CDATA[<body bgcolor="#FFFFFF" text="#000000"> 对不起，你的浏览器不支持框架的显示。</p>
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