<div id="div1" style="height:300px;width:200px;">http://www.itdos.com</div>
<div id="div2" style="height:30px;width:20px;">http://www.itdos.com</div>
获取div1的宽高度:
alert(document.getElementById("div1").offsetHeight); //兼容FF、IE等
alert(document.getElementById("div1").offsetWidth); //兼容FF、IE等
设置div1的宽高度为div2的宽高度:
document.getElementById("div1").style.height=document.getElementById("div2").offsetHeight; //仅IE
document.getElementById("div1").style.height=document.getElementById("div2").offsetHeight+ "px"; //兼容FF、IE等
document.getElementById("div1").style.width=document.getElementById("div2").offsetWidth; //仅IE
document.getElementById("div1").style.width=document.getElementById("div2").offsetWidth+ "px"; //兼容FF、IE等
以下为获取设置父窗口iframe高度
var parentFrame = parent.document.getElementsByTagName("IFRAME");//获取父窗口的iframe
var h = document.documentElement.scrollHeight;//获取子窗口的高度 FF
h = document.body.scrollHeight; //IE
parentFrame
.style.height = h +"px";//设置父窗口iframe高度