IE：

 

Code cssStr = "p { color:#FF0000;} a { font-size:9pt;}"; var style = win.document.createStyleSheet(); style.cssText = cssStr;

 

FF：

 

Code cssStr = "p { color:#FF0000;} a { font-size:9pt;}"; var style = win.document.createElement("style"); style.type = "text/css"; style.innerHTML = cssStr; win.document.getElementsByTagName("HEAD").item(0).appendChild(style);