iframe自动适应宽高度

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页面a.html代码如下

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>a</title>

<style type="text/css">
body{margin:auto; text-align:center;}
div{margin:auto; text-align:center;}

</style>

<script type="text/javascript">

 function getBody_WandH(){
  var headH = window.frames["head"].document.body.scrollHeight;
  var headW = window.frames["head"].document.body.scrollWidth;
  var head = document.getElementById("head");
  head.style.cssText = "width:" + headW + "px; " + "height:" + headH + "px;";
 }
 window.onload = getBody_WandH;

</script>

</head>

<body>

<iframe id="head" name="head" frameborder="0" scrolling="no" src="b.html"></iframe><br />

</body>
</html>

 

页面b.html的代码如下:

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>b</title>
<style type="text/css">
body{margin:0px; padding:0px; text-align:center;}
div{margin:auto; text-align:center;}

</style>

</head>

<body>
<div id="bdiv" style="width:360px; height:360px;">
<div style="width:350px; height:350px; background:#999; border:1px solid #00F;">
 <span id="b_aid" onclick="getStr();">我是b页面的div.</span>
</div>
</div>
</body>
</html>

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