<!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>js访问frame中的DOM</title> </head> <body> <iframe name="newiframe" id="newiframe" src="a.html" mce_src="a.html" width="500" height="200" ></iframe> <script type="text/javascript"> var temp_css; temp_css+="<style type=\"text/css\">"; temp_css+="body{ margin-top:100px; background-color:#f00; font-size:20px;}"; temp_css+="</style>"; window.onload=function(){ var obj=window.frames["newiframe"]; obj.document.body.innerHTML+=temp_css; } </script> </body> </html>
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原文：http://www.cnblogs.com/positive/p/3658834.html