iframe样式修改

修改iframe内部元素样式，并且内部内容高度自适应：

  <iframe srcdoc="" frameborder="0" id="demo" style="vertical-align:top;width:80%"  onload="getIframeDom()"></iframe>

function getIframeDom(){
                $("#demo").contents().find("p").css('margin','0');  
                $("#demo").contents().find("body").css('margin','0'); 
                changeFrameHeight();  
            }
            window.onresize=function(){  
                 changeFrameHeight();  
            } 
            function changeFrameHeight(){
                var ifm= document.getElementById("demo"); 
                var iheight=$("#demo").contents().find("body").height(); 
                $("#demo").height(iheight);
            }