怎么关闭iframe

如何关闭iframe
如何在不移除iframe的情况下将iframe的页面卸载

------解决方案--------------------
<iframe border=0 width=0 height=0 > </iframe>
<script>
document.all.iframe.src= " ";
document.all.iframe.border = 0;
document.all.iframe.width=0;
document.all.iframe.height=0
</script>
------解决方案--------------------
document.body.removeChild(document.getElementById( "iframe_id "))