<script language="javascript">
//获取域名
host = window.location.host;
host2=document.domain;
//获取页面完整地址
url = window.location.href;
document.write("<br>host="+host)
document.write("<br>host2="+host2)
document.write("<br>url="+url)
</script>
原文：http://my.oschina.net/TOW/blog/526184