为了清晰起见，下面用最简单的HTML和JavaScript来说明。有这么一段HTML（head部分是标准的head，doctype使用xhtml-transitional的DTD）：
<body>
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,28,0" width="100%" height="100%">
<param name="movie" value="Test.swf" />
<param name="quality" value="high" />
<embed src="Test.swf" quality="high" pluginspage="http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="100%" height="100%"></embed>
</object>
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,28,0" width="100%" height="100%">
<param name="movie" value="Test.swf" />
<param name="quality" value="high" />
<embed src="Test.swf" quality="high" pluginspage="http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="100%" height="100%"></embed>
</body>
</object>
猜猜结果分别是什么？还有，再猜猜o.innerHTML是什么？大家可以自己试试。上面的结果分别是4和2，是不是很诡异？
