IFrame透明背景
/* in the iframe element */
<iframe src="content.html" allowTransparency="true">
</iframe>
/* in the iframe docuement, in this case content.html */
body {
background-color:transparent;
}
/* in the iframe element */
<iframe src="content.html" allowTransparency="true">
</iframe>
/* in the iframe docuement, in this case content.html */
body {
background-color:transparent;
}