应用场景是：iframe页面没有滚动条，在父窗体中出现滚动条，锚点标记就会失效，因为，锚点是根据当前窗口滚动条滚动窗口的，成为子窗体后没有了滚动条，自然不会滚动。
解决办法是：用js判断页面是否被嵌套，用js计算iframe在父窗体位置，锚点在firame中的位置，两者相加成为父窗体的滚动。
遇到问题：获取父窗体元素（因为有域限制，所有需要在网络环境下方位（即http://domain.com））；父窗体嵌套多个iframe，判断是否是当前iframe页面。
代码：
父窗体页面 index.html
<!doctype html>
<html>
<head>
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
border: 0;
}
html,
body{
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<div style="width:100%;background:#f00;height:500px;"></div>
<a href="" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >dd</a>
<a href="" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >ddd</a>
<iframe name="iframe2" id="iframe2" src="iframe.html?a=b&c=d" style="width:100%;height:2060px;"></iframe>
<iframe name="iframe2" id="iframe2" src="iframe.html?a=d&c=b" style="width:100%;height:2060px;"></iframe>
</body>
</html>
子窗体页面iframe.html
<!doctype html>
<html>
<head>
<title></title>
<style type="text/css">
a{
padding: 5px;
border: 1px solid #f00;
float: left;
display: block;
margin-right: 5px;
}
div{
width: 80%;
margin: 10px auto;
height: 500px;
border: 1px solid #f00;
font-size: 30px;
}
</style>
<script type="text/javascript" src="jquery-1.8.2.min.js"></script>
<script type="text/javascript">
$(function(){
//如果是iframe则需要在网络中访问，因为js里有域限制
//如果没有iframe则不进行处理，
if(window!==window.top){
//获取top窗口中的iframe，如果有iframe嵌套过多，请自行修改
var iframeList=window.top.document.getElementsByTagName('iframe');
for(var i=0;i<iframeList.length;i++){
//判断当前窗口是否循环中的iframe
if(window.location.toString().indexOf(iframeList[i].getAttribute('src').toString())!=-1){ //等自己的所在iframe加载完成给a锚点加事件
window.top.document.getElementsByTagName('iframe')[i].onload=function(){
//确定iframe在父窗体的距顶部距离
var top = window.top.document.getElementsByTagName('iframe')[i].offsetTop;
$('a').each(function(){
var href = $(this).attr('href');
if(href.indexOf('#')!=-1){//判断是否是锚点而不是链接
var name = href.substring(href.indexOf('#')+1);
$(this).bind('click',function(){
$('a').each(function(){
if($(this).attr('name')==name){
//父窗口滚动
$(window.parent).scrollTop($(this).offset().top+top);
}
});
});
}
});
}
}
}
} }); </script>
</head>
<body>
<a href="#a" rel="external nofollow" >a</a>
<a href="#b" rel="external nofollow" >b</a>
<a href="#c" rel="external nofollow" >c</a>
<a href="#d" rel="external nofollow" >d</a>
<div><a href="" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" name="a">A</a></div>
<div><a href="" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" name="b">B</a></div>
<div><a href="" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" name="c">C</a></div>
<div><a href="" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" name="d">D</a></div></body>
</html>
