在页面中如何控制内嵌的iframe滚动呢？方法是使用iframe window的scroll方法：
1、获取iframe的窗口对象
var iwin = document.getElementById('iframe1').contentWindow;
2 、获取iframe的窗口document对象
var doc = iwin.document;
3、调用iframe window对象的scroll方法
iwin.scroll(0,doc.body.scrollHeight);
scroll两个参数为x,y轴的滚动量
doc.body.scrollHeight为iframe页面的高度（包含未显示的部分）
一个综合应用例子如下：
<html> <head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>hover test</title>
<style type="text/css">
ul{
background-color:#ff00ff;
display:block;
}
.toc li{
position:relative; width:10em;
background-color:#00ff00;
display:block;
}
li a {
/*display:block;*/ /*若以块的模式显示，则会占满整个父元素空间*/
background-color:#0000ff;
} /*必须让a成为块级元素*/
li a i{
display:none;
}
li a:hover{
text-align:left;
}/*这里添加的代码只是为了让IE6显示，没有特殊功能，除text-decoration，color，z-index外都可以写*/
.toc li a:hover i{
display:block;
width:6em;
position:absolute;
top:0;
left:100%; /* 这里100%指相对于元素li的宽度*/
margin:-1em 0 0 0em;
padding:1em;
background:#cde;
border:1px solid red;
text-align:left;
z-index:10000;
}
</style>
</head>
<body>
<iframe id="iframe1" src="" width="400" height="300"></iframe>
html代码
<ul class="toc" id="toc">
<li><a href="1.html">Chapter 1<i>In which a dragon is seen</i></a></li>
<li><a href="2.html">Chapter 1<i>In which a knight is summoned</i></a></li>
<li><a href="3.html">Chapter 1<i>In which a proncess is disappointed</i></a></li>
<li><a href="4.html">Chapter 1<i>In which a dragon is seen</i></a></li>
<li><a href="5.html">Chapter 1<i>In which a dragon is seen</i></a></li>
<li><a href="6.html">Chapter 1<i>In which a dragon is seen</i></a></li>
<li><a href="7.html">Chapter 1<i>In which a dragon is seen</i></a></li>
</ul>
<script language="javascript">
function getElementAbsPos(e) {
var t = e.offsetTop;
var l = e.offsetLeft;
while(e = e.offsetParent) {
t += e.offsetTop;
l += e.offsetLeft;
}
return {left:l,top:t};
}
function getPosition(obj){
var left = 0;
var top = 0;
while(obj != document.body){
left = obj.offsetLeft;
top = obj.offsetTop;
obj = obj.offsetParent;
}
return left;
}
var lis = document.getElementsByTagName('li');
var iwin = document.getElementById('iframe1').contentWindow;
var doc = iwin.document;
for(var i=0;i<lis.length;i++){
lis[i].onmouseover = function(){
var obji = this.childNodes[0].childNodes[1];
doc.writeln('<br>'+ obji.innerText + ',' + getElementAbsPos(document.getElementById('toc')).left);
doc.writeln('<br>'+ obji.offsetLeft + ',' + getElementAbsPos(obji).left + ',' + obji.offsetWidth+ ',' + obji.style.left);
doc.writeln('<br><b>'+ doc.body.scrollHeight + '</b>')
iwin.scroll(0,doc.body.scrollHeight);
//iwin.scrollTo(10000); //无效
}
}
</script>
</body>
</html>