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