试试：
iframe.contentwindow.document.documentElement.innerHTML
document.getElementById("MyIFrame").contentDocument.getElementById("s").style.color="blue"; 详细代码如下: TestIFrame.htm: <html> <head> <script type="text/javascript"> function f(){ var doc; if (document.all){//IE doc = document.frames["MyIFrame"].document; }else{//Firefox doc = document.getElementById("MyIFrame").contentDocument; } doc.getElementById("s").style.color="blue"; } </script> </head> <body onload="f()"> <iframe id = "MyIFrame" name = "MyIFrame" src = "MyIFrame.htm" width = "100" height="100"> </body> </html> MyIFrame.htm: <h1 id = "s" style="color:red;" >内容<h1>
