IFrame 获取内容

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>