我想在iframed页面播放YouTube视频。在index.html中，我创建了一个iframe，其源为video.html。您可以建议哪些JavaScript命令？
的index.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<iframe src="video.html" id="vidframe" width="100%" height="500"></iframe>
</body>
</html>
video.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Video</title>
</head>
<body>
<iframe width="640" height="480" src="//www.youtube.com/embed/jofNR_WkoCE" frameborder="0" allowfullscreen></iframe>
</body>
</html>