如何使用javascript获取iframe正文

Question

here are 02 pages:

Some content is here.

<iframe id="sumon_iframe" src="iframe_content.php"></iframe>
<script language="JavaScript" type="text/javascript">
  var iframe_id=document.getElementsByTagName('iframe')[0].id; //i get it perfectly
  var content=iframe_id.body.innerHTML; //i don't get value
  alert(content);
</script>

How do I get the iframe 's innerHTML ( Some content is here )in iframe.php page using Javascript?

Answer 1

you must use

iframe.contentDocument

or

iframe.contentWindow

for ie