javascript实现:
top.location.href
//顶级窗口的地址
this.location.href
//当前窗口的地址
PHP实现
#测试网址: http://localhost/blog/testurl.php?id=5
//获取域名或主机地址
echo $_SERVER['HTTP_HOST'];
# localhost
//获取网页地址
echo $_SERVER['PHP_SELF'];
# /blog/testurl.php
//获取网址参数
echo $_SERVER["QUERY_STRING"];
# id=5
//获取用户代理
echo $_SERVER['HTTP_REFERER'];
//获取完整的url
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];
# http://localhost/blog/testurl.php?id=5
//包含端口号的完整url
echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
# http://localhost:80/blog/testurl.php?id=5
//只取路径
$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"];
echo dirname($url);
# http://localhost/blog