页面代码：
<div style="border:1px solid #7e99c6" id="frameBox">
<iframe id="frameWin" src="01.html" name="opWin" style="100%; height:100% " frameborder="0" scrolling="no" onload="test2()"></iframe>
</div>
js脚本（加在主页面）：
function test2(){
var frameWin = document.getElementById("frameWin");
var frameBox = document.getElementById("frameBox");
var newHeight;
if (frameWin.Document){
newHeight = frameWin.Document.body.scrollHeight + 20 + "px";
}else{
newHeight = frameWin.contentDocument.body.scrollHeight+ 20 + "px";
}
frameWin.style.height = newHeight;
frameBox.style.height = newHeight;
}